E R I S is a newly found small planetary body whose average distance lies some 1.7 times further than the similar sized Pluto. It was only recently named Eris by the International Astronomical Union (I.A.U), being proclaimed to the world on 13th September 2006. Pronounced ee-riss, Eris was whimsically given by its discoverers the name as Xena, the fictitious warrior princess and the title of the well-liked late-1990&8217;s television series set in ancient mythological times. Before the IAU official announcement, it was known to planetary astronomers as the more uninspiring and clinically sounding object 2003 UB313.
Eris was first found at Mount Palomar observatory in the United States by the team of Michael Brown, Chad Trujillo and David Rabinowitz on 05th January 2005. It was achieved after carefully inspecting four different deep CCD images in a routine search program that had been taken earlier on 21st October 2003 using the 1.2m Samuel Oschin reflector at Mt. Palomar.
This was one of Brown’s thirteen (13) major trans-Neptunian discoveries to date, with Eris and its small moon Dysnomia (Eris I) being among the latest of their major discoveries. After some additional images and further detailed investigations looking for earlier positions of Eris from past image plates, the rough parameters of the orbit were soon confirmed. This new discovery was prematurely announced on 29th July 2005 amid some controversy, as another rival Spanish team of astronomers were likely to publish before them. Another issue was that the information was accidentally released on the Internet. For a short while, most remained unsure about the real planetary nature of Eris, mainly because of its considerable faintness and its very slow movement against the background stars. At first Eris was to be considered the 10th planet of our solar system, but probably with some justification, this was soon was diminished, by the new definition of dwarf planet or Scattered Disk Object (SDO).
ERIS DATADiscoverer : Brown et.al. Date : 05 January 2005 Satellites : 1 Diameter : 2400±100 km. Polar Tilt : Unknown Period (P) : 557.769 years Synodic Period : 364.61 days Orbital Velocity : 3.44 kms-1 Perihelion (q) : 37.77 A.U. Aphelion (Q) : 97.56 A.U. Eccentricity (e) : 0.4410 Inclination (i) : 44.034o Mass : ?? x 1019 kg. Mean Density : ?? g.cm-3 Mean Distance : 67.67 AU or x 108 km Sidereal Rotation : > 8 hr.? Mean Sidereal Rotation : > 8 hr. ? Maximum Diameter : 0.103″ (arcsec) Minimum Diameter : 0.040″ (arcsec) Maximum Magnitude : 14.8 Minimum Magnitude : 18.8 |
As previously stated, Eris’s name was announced on 13th September 2006 by the official naming body of the I.A.U. in their Circular No. 8747. This was only several weeks after the IAU Naming Committee decided on a new important definition of planets, placing Eris as the new catergory of so-called dwarf planets. This new sub-planet category presently includes the first minor planet discovered, Ceres, and the former planet of Pluto that was found by Charles Tombaugh in 1930’. All dwarf planets are now given similar designations used for known asteroids, namely, (1) Ceres, (134340) Pluto and (136199) Eris. (The bracketed value being the ordered sequential asteroid number by discovery date.)
At the mean distance of 67.7 AU or 10.1 billion kilometres, Eris is almost twice the distance of Pluto. However, the highly eccentric shape of the orbit is very unlike the other eight planets, and even more distorted than fellow dwarf planet, Pluto. Eris’ orbit is highly inclined to the ecliptic at 44.2o, whose very high eccentricity causes the possible distances ti be anywhere between 37.8 to 97.6 A.U or 5.65 to 14.6 billion kilometers from the Sun. At the time of Eris’ discovery the distance just happens to be near the maximum of these two values, reaching aphelion on 07th April 1977. Using the orbital period of 557.769 years, the last closest approach to the Sun (perihelion) occurred back to the 19th May 1698 when Eris was in northern Virgo. This will not happen again until the 24th February 2256 AD. During each perihelion, the maximum opposition brightness reaches 14.8 magnitude. At aphelion, this brightness may descend to a lowly 18.8 magnitude.
Eris subtends a very small observed diameter between 0.040 and 0.103 arcsec, and this concludes that the diameter must be about 2,800 kilometers. Some difficult questions do remain about Eris’ true diameter, which commonly range in references between 2,400 and 3,000 kilometres - but it is definitely bigger than Pluto.
Most of the obtained images show the dwarf planet as star-like. Even using the Hubble Space Telescope (HST) or large ground-based telescopes will reveal a very tiny featureless disk. For this reason we know little about the sidereal rotational period of this distant dwarf planet. Recent photometric observations suggest that it is less than 8 hours, and this will probably remain so until some better quality photometric observation have been made or by some future dedicated space mission to Eris is planned. Even if such a mission were proposed, the mission results would likely take more than two decades before any details were made - not accounting the time to making the satellite. At the moment the best available images were recently obtained using the large Hawaiian 10-meter Keck Telescope. (See Eris image). From what limited information we have, the obtained spectra does suggests the body is similar to Pluto, being composed of mixture of water ice and methane - frozen rock-hard by the extreme low temperatures of only 30K.
Eris also has one known moon, named Eris I or asteroid Dysnomia (136199), and was discovered using the large 10-metre telescope at Keck observatory in Hawaii. Ay first the moon was amusingly named Gabrielle by the discoverers - after the long-term female companion to Xena - the Warrior Princess in the camp hit television series of the 1990’s. Dysnomia’s name is taken from the mythological Greek demon goddess of lawlessness being one of Eris’ daughters. We know little about Dysnomia itself, and in recent decades such asteroids with orbiting moons now seem an accepted common occurrence. The discovery has proved to be important as astronomers can calculate the mass of Eris from the little moon’s orbital parameters. Dysnomia when observed from Earth remains very faint, averaging well below 21st magnitude in brightness.
ERIS is named after the Greek goddess of discord and trouble, whose Roman equivalent is Discordia. Her name is associated in the Greek mythology with many of the human destructive passions; such as lawlessness, discord, fighting, rivalry, jealousy, maritial strife and quarrelling. Homer describes her as the twin sister of Ares (Mars), the god of War, and she always remains his close companion Like him, Eris is both insatiate and lustful for blood and carnage especially on the battle-field. She is often given the personification of noble rivalry, by representing stimulation towards even fools or imbeciles towards her desire for conflict, struggle and toil.
She commonly features in some of the ancient myths. For example, Hesiod; the 8th Century Greek poet, who says in his “Works and Days” (11);
“[Eris] is hateful ... [she is the one] who builds up evil war, and slaughter. She is harsh; no man loves her, but under compulsion and by will of the immortals, men promote this rough Eris (Strife).”
As Hesiod also wrote in his “Shield of Herakles” (139);
“[Eris upon [Phobos (Fear)] grim brow hovered frightful Eris (Battle-Strife) who arrays the throng of men: pitiless she, for she took away the mind and senses of poor wretches who made war against the son of Zeus...”
Hesiod in the Pantheon of Greek gods places her as the vicious daughter of Nyx (Night)- the mother of trouble, oblivion, hunger, pain, murder and carnage, brawls and deceit.
“...deadly Night bare Nemesis (Indignation) to afflict mortal men, and after her, Apate (Envy) and Philotes (Friendship) and hateful Geras (Age) and hard-hearted Eris (Strife).”
My own favourite quotes about Eris is from Quintus Smymaeus’ (or sometimes Quintus Calabar), a poet from the 4th Century AD, whose book “Fall of Troy ” (9,324) states;
“But the sons of men fought on, and slew; and Eris (Strife incarnate) gloating watched.”
and
“Caught she two javelins in the hand that grasped
Her shield-band; but her strong right hand laid hold
On a huge halberd, sharp of either blade,
Which terrible Eris gave to Ares’ child
To be her Titan weapon in the strife
That raveneth souls of men. Laughing for glee
Thereover, swiftly flashed she forth the ring
Of towers. Her coming kindled all the sons
Of Troy to rush into the battle forth
Which crowneth men with glory.”
And towards her victims;
“In flames, my kindred in disastrous strife
Perishing: bitterer sorrow is there none!”
In one important legend, both Eris and Ares were the only ones among the Pantheon gods who was not invited to the marriage of Peleus and Thetis. In revenge she threw an apple made gold among the guests inscribed with the words “To the fairest”. Needless to say, three goddesses then claim the prize for themselves, and in doing so set-out the precursory reasons for the legendary story of the Trojan War.
Side by side with this destructive Eris was a beneficent Eris, her opposing twin sister. She, according to Hesiod, was the compassionate reflection of the other good side of human nature, but was oddly described as a non-person like some background metaphysical or non-corporeal entity. Like most of the allegorical myths or emblematic legends throughout Greek mythology, there must always be some equal counterpoint - an opposing god who brings some needed balance to Nature.
COMMENT : Her name is appropriately hidden in the word “perish” means literally to suffer death To be on the wrong side of Eris is certainly central to what she will inflict on individuals who don’t respect or properly venerate her.
At times Eris can even outshine Pluto during its long orbit, reaching the maximum magnitude of about 15.5. When the dwarf planet is furthest from the Sun the brightness may drop as low as 18.8 magnitude!
In the past few centuries, Eris was really a southern object, whose position around 1800 AD was within the southern constellation of Indus. Eris then crossed through Indus and into northern Tucanae until about 1817, before moving into southern Grus, where it stayed until the early 1840’s. From then it moved into Phoenix around 1874, then onto Sculptor until the 1930, and thence into the equatorial constellation of Cetus the Whale. Eris will remain within this constellation’s area between 2006 and 2015, and does not leave Cetus until 19th February 2037!
In the future, Eris will gradually move into the zodiac constellation of Pisces where it will stay until the 20th May 2060. It will cross back an forth between Cetus and Pisces several times for a decade or so, where it will move into Aries on 10 April 2065. Next it will leave Aries and become a northern object in the non-zodiacal constellation of Perseus sometime in June 2127. After 2175 AD, Eris will become a far northern object, residing in Camelopardalis until the 23rd Century, when the declination reaches its maximum of around +64oN in 2200 AD.
It should be noted that these positions and times remain tentative because the lack of historical data on the observed positions. So far the earliest identified position is from a plate made on 20th January 1963, meaning that we have orbital information based on just 43-years (2006) or just 7.7% of the entire orbit.
All sky positions given below should be sufficiently accurate for most amateur purposes, however, beyond the next few decades future ephemerides may change slightly with adjustments in the orbital elements. Perhaps the greatest difficulties are assessing the many perturbations caused by the gravitational pull of the other planets and planetary bodies in the Solar System. Better knowledge of these effects will likely be determined in the coming decades.
Telescopically, distant Eris only appears as a very faint ‘star’ but remains invisible to all amateur telescopes. It may also be possible to record the body by amateur deep CCD images, though its detection likely requires at least 30cm to 40cm apertures.
*********************************************************
0h UT (J2000) Mag Δ r El. Con
DATE R.A. Decl. V A.U. A.U. o
hh mm.m o '
*********************************************************
--2005--
31 Dec 01 35.3 -05 38 18.8 96.71 96.89 100 Cet
--2006--
14 Jan 01 35.2 -05 36 18.8 96.94 96.89 086 Cet
28 Jan 01 35.3 -05 33 18.8 97.17 96.89 073 Cet
11 Feb 01 35.5 -05 29 18.8 97.39 96.88 059 Cet
25 Feb 01 35.8 -05 25 18.8 97.57 96.88 046 Cet
11 Mar 01 36.2 -05 20 18.8 97.71 96.88 033 Cet
25 Mar 01 36.7 -05 16 18.8 97.81 96.88 022 Cet
08 Apr 01 37.2 -05 12 18.8 97.85 96.88 014 Cet
22 Apr 01 37.7 -05 08 18.8 97.83 96.87 018 Cet
06 May 01 38.3 -05 05 18.8 97.76 96.87 028 Cet
20 May 01 38.8 -05 03 18.8 97.64 96.87 040 Cet
03 Jun 01 39.2 -05 02 18.8 97.48 96.87 053 Cet
17 Jun 01 39.5 -05 01 18.8 97.29 96.87 065 Cet
01 Jul 01 39.8 -05 01 18.8 97.07 96.86 078 Cet
15 Jul 01 39.9 -05 02 18.8 96.84 96.86 091 Cet
29 Jul 01 39.9 -05 04 18.8 96.61 96.86 104 Cet
12 Aug 01 39.8 -05 06 18.8 96.40 96.86 117 Cet
26 Aug 01 39.5 -05 09 18.8 96.21 96.86 130 Cet
09 Sep 01 39.2 -05 12 18.8 96.05 96.86 143 Cet
23 Sep 01 38.7 -05 15 18.7 95.95 96.85 155 Cet
07 Oct 01 38.3 -05 18 18.7 95.89 96.85 164 Cet
21 Oct 01 37.7 -05 21 18.7 95.89 96.85 164 Cet
04 Nov 01 37.2 -05 23 18.7 95.95 96.85 155 Cet
18 Nov 01 36.7 -05 24 18.7 96.06 96.85 142 Cet
02 Dec 01 36.3 -05 25 18.8 96.22 96.84 129 Cet
16 Dec 01 36.0 -05 24 18.8 96.41 96.84 116 Cet
30 Dec 01 35.8 -05 23 18.8 96.64 96.84 102 Cet
*********************************************************
*********************************************************
0h UT (J2000) Mag Δ r El. Con
DATE R.A. Decl. V A.U. A.U. o
hh mm.m o '
*********************************************************
13 Jan 01 35.7 -05 21 18.8 96.87 96.84 088 Cet
27 Jan 01 35.8 -05 18 18.8 97.10 96.84 074 Cet
10 Feb 01 35.9 -05 14 18.8 97.32 96.83 060 Cet
24 Feb 01 36.2 -05 10 18.8 97.50 96.83 047 Cet
10 Mar 01 36.6 -05 06 18.8 97.65 96.83 034 Cet
24 Mar 01 37.1 -05 01 18.8 97.75 96.83 022 Cet
07 Apr 01 37.6 -04 57 18.8 97.79 96.83 015 Cet
21 Apr 01 38.2 -04 54 18.8 97.78 96.82 017 Cet
05 May 01 38.7 -04 50 18.8 97.72 96.82 027 Cet
19 May 01 39.2 -04 48 18.8 97.61 96.82 039 Cet
02 Jun 01 39.6 -04 46 18.8 97.45 96.82 051 Cet
16 Jun 01 40.0 -04 46 18.8 97.26 96.82 064 Cet
30 Jun 01 40.2 -04 46 18.8 97.04 96.81 077 Cet
14 Jul 01 40.4 -04 47 18.8 96.81 96.81 090 Cet
28 Jul 01 40.4 -04 48 18.8 96.58 96.81 103 Cet
11 Aug 01 40.3 -04 51 18.8 96.37 96.81 116 Cet
25 Aug 01 40.0 -04 53 18.8 96.17 96.81 129 Cet
08 Sep 01 39.7 -04 57 18.8 96.02 96.80 141 Cet
22 Sep 01 39.3 -04 60 18.7 95.90 96.80 153 Cet
06 Oct 01 38.8 -05 03 18.7 95.84 96.80 163 Cet
20 Oct 01 38.3 -05 05 18.7 95.84 96.80 165 Cet
03 Nov 01 37.8 -05 07 18.7 95.89 96.80 156 Cet
17 Nov 01 37.3 -05 09 18.7 95.99 96.79 144 Cet
01 Dec 01 36.9 -05 09 18.8 96.15 96.79 131 Cet
15 Dec 01 36.5 -05 09 18.8 96.34 96.79 117 Cet
29 Dec 01 36.3 -05 08 18.8 96.56 96.79 103 Cet
*********************************************************
*********************************************************
0h UT (J2000) Mag Δ r El. Con
DATE R.A. Decl. V A.U. A.U. o
hh mm.m o '
*********************************************************
12 Jan 01 36.2 -05 06 18.8 96.79 96.79 089 Cet
26 Jan 01 36.2 -05 03 18.8 97.03 96.78 076 Cet
09 Feb 01 36.4 -04 59 18.8 97.24 96.78 062 Cet
23 Feb 01 36.7 -04 55 18.8 97.43 96.78 048 Cet
08 Mar 01 37.1 -04 51 18.8 97.59 96.78 035 Cet
22 Mar 01 37.6 -04 46 18.8 97.69 96.78 024 Cet
05 Apr 01 38.1 -04 42 18.8 97.74 96.77 015 Cet
19 Apr 01 38.6 -04 39 18.8 97.74 96.77 016 Cet
03 May 01 39.2 -04 35 18.8 97.68 96.77 025 Cet
17 May 01 39.7 -04 33 18.8 97.57 96.77 037 Cet
31 May 01 40.1 -04 31 18.8 97.42 96.77 050 Cet
14 Jun 01 40.5 -04 30 18.8 97.23 96.76 063 Cet
28 Jun 01 40.7 -04 30 18.8 97.01 96.76 075 Cet
12 Jul 01 40.9 -04 31 18.8 96.79 96.76 088 Cet
26 Jul 01 40.9 -04 33 18.8 96.56 96.76 101 Cet
09 Aug 01 40.8 -04 35 18.8 96.34 96.76 114 Cet
23 Aug 01 40.6 -04 38 18.8 96.14 96.75 127 Cet
06 Sep 01 40.2 -04 41 18.8 95.98 96.75 140 Cet
20 Sep 01 39.8 -04 44 18.7 95.86 96.75 152 Cet
04 Oct 01 39.3 -04 47 18.7 95.79 96.75 163 Cet
18 Oct 01 38.8 -04 50 18.7 95.78 96.75 165 Cet
01 Nov 01 38.3 -04 52 18.7 95.83 96.74 157 Cet
15 Nov 01 37.8 -04 53 18.7 95.93 96.74 145 Cet
29 Nov 01 37.4 -04 54 18.8 96.08 96.74 132 Cet
13 Dec 01 37.1 -04 54 18.8 96.27 96.74 118 Cet
27 Dec 01 36.8 -04 52 18.8 96.48 96.74 105 Cet
*********************************************************
*********************************************************
0h UT (J2000) Mag Δ r El. Con
DATE R.A. Decl. V A.U. A.U. o
hh mm.m o '
*********************************************************
10 Jan 01 36.7 -04 50 18.8 96.72 96.73 091 Cet
24 Jan 01 36.7 -04 48 18.8 96.95 96.73 077 Cet
07 Feb 01 36.9 -04 44 18.8 97.17 96.73 063 Cet
21 Feb 01 37.2 -04 40 18.8 97.36 96.73 050 Cet
07 Mar 01 37.5 -04 36 18.8 97.52 96.73 037 Cet
21 Mar 01 38.0 -04 32 18.8 97.63 96.72 025 Cet
04 Apr 01 38.5 -04 27 18.8 97.69 96.72 015 Cet
18 Apr 01 39.1 -04 24 18.8 97.69 96.72 015 Cet
02 May 01 39.6 -04 21 18.8 97.64 96.72 024 Cet
16 May 01 40.1 -04 18 18.8 97.53 96.72 036 Cet
30 May 01 40.6 -04 16 18.8 97.38 96.71 048 Cet
13 Jun 01 40.9 -04 15 18.8 97.20 96.71 061 Cet
27 Jun 01 41.2 -04 15 18.8 96.98 96.71 074 Cet
11 Jul 01 41.4 -04 16 18.8 96.76 96.71 087 Cet
25 Jul 01 41.4 -04 17 18.8 96.53 96.71 100 Cet
08 Aug 01 41.3 -04 19 18.8 96.30 96.70 113 Cet
22 Aug 01 41.1 -04 22 18.8 96.10 96.70 126 Cet
05 Sep 01 40.8 -04 25 18.8 95.94 96.70 139 Cet
19 Sep 01 40.4 -04 28 18.7 95.82 96.70 151 Cet
03 Oct 01 39.9 -04 31 18.7 95.74 96.69 162 Cet
17 Oct 01 39.4 -04 34 18.7 95.73 96.69 166 Cet
31 Oct 01 38.9 -04 36 18.7 95.77 96.69 159 Cet
14 Nov 01 38.4 -04 38 18.7 95.86 96.69 147 Cet
28 Nov 01 37.9 -04 38 18.8 96.00 96.69 134 Cet
12 Dec 01 37.6 -04 38 18.8 96.19 96.68 120 Cet
26 Dec 01 37.3 -04 37 18.8 96.40 96.68 106 Cet
*********************************************************
*********************************************************
0h UT (J2000) Mag Δ r El. Con
DATE R.A. Decl. V A.U. A.U. o
hh mm.m o '
*********************************************************
09 Jan 01 37.2 -04 35 18.8 96.64 96.68 092 Cet
23 Jan 01 37.2 -04 32 18.8 96.87 96.68 078 Cet
06 Feb 01 37.4 -04 29 18.8 97.09 96.68 065 Cet
20 Feb 01 37.6 -04 25 18.8 97.29 96.67 051 Cet
06 Mar 01 38.0 -04 21 18.8 97.45 96.67 038 Cet
20 Mar 01 38.5 -04 17 18.8 97.57 96.67 026 Cet
03 Apr 01 39.0 -04 13 18.8 97.63 96.67 016 Cet
17 Apr 01 39.5 -04 09 18.7 97.64 96.67 014 Cet
01 May 01 40.1 -04 05 18.8 97.59 96.66 023 Cet
15 May 01 40.6 -04 03 18.8 97.49 96.66 035 Cet
29 May 01 41.0 -04 01 18.8 97.35 96.66 047 Cet
12 Jun 01 41.4 -03 60 18.8 97.16 96.66 060 Cet
26 Jun 01 41.7 -03 60 18.8 96.95 96.65 073 Cet
10 Jul 01 41.9 -04 00 18.8 96.73 96.65 086 Cet
24 Jul 01 41.9 -04 02 18.8 96.49 96.65 099 Cet
07 Aug 01 41.8 -04 04 18.8 96.27 96.65 112 Cet
21 Aug 01 41.6 -04 06 18.8 96.07 96.65 125 Cet
04 Sep 01 41.3 -04 09 18.7 95.90 96.64 137 Cet
18 Sep 01 40.9 -04 12 18.7 95.77 96.64 150 Cet
02 Oct 01 40.5 -04 15 18.7 95.69 96.64 161 Cet
16 Oct 01 39.9 -04 18 18.7 95.67 96.64 166 Cet
30 Oct 01 39.4 -04 20 18.7 95.70 96.63 160 Cet
13 Nov 01 38.9 -04 22 18.7 95.79 96.63 148 Cet
27 Nov 01 38.5 -04 23 18.7 95.93 96.63 135 Cet
11 Dec 01 38.1 -04 23 18.8 96.11 96.63 121 Cet
25 Dec 01 37.9 -04 22 18.8 96.32 96.63 108 Cet
*********************************************************
*********************************************************
0h UT (J2000) Mag Δ r El. Con
DATE R.A. Decl. V A.U. A.U. o
hh mm.m o '
*********************************************************
08 Jan 01 37.7 -04 20 18.8 96.55 96.62 094 Cet
22 Jan 01 37.7 -04 17 18.8 96.79 96.62 080 Cet
05 Feb 01 37.9 -04 14 18.8 97.01 96.62 066 Cet
19 Feb 01 38.1 -04 10 18.8 97.21 96.62 053 Cet
05 Mar 01 38.5 -04 06 18.8 97.38 96.61 039 Cet
19 Mar 01 38.9 -04 02 18.8 97.50 96.61 027 Cet
02 Apr 01 39.4 -03 58 18.7 97.57 96.61 016 Cet
16 Apr 01 40.0 -03 54 18.7 97.58 96.61 014 Cet
30 Apr 01 40.5 -03 50 18.8 97.54 96.60 022 Cet
14 May 01 41.0 -03 48 18.8 97.45 96.60 033 Cet
28 May 01 41.5 -03 46 18.8 97.31 96.60 046 Cet
11 Jun 01 41.9 -03 45 18.8 97.13 96.60 058 Cet
25 Jun 01 42.2 -03 44 18.8 96.92 96.60 071 Cet
09 Jul 01 42.3 -03 45 18.8 96.69 96.59 084 Cet
23 Jul 01 42.4 -03 46 18.8 96.46 96.59 097 Cet
06 Aug 01 42.3 -03 48 18.8 96.23 96.59 110 Cet
20 Aug 01 42.2 -03 50 18.8 96.03 96.59 123 Cet
03 Sep 01 41.9 -03 53 18.7 95.85 96.58 136 Cet
17 Sep 01 41.5 -03 56 18.7 95.72 96.58 149 Cet
01 Oct 01 41.0 -03 59 18.7 95.64 96.58 160 Cet
15 Oct 01 40.5 -04 02 18.7 95.61 96.58 167 Cet
29 Oct 01 40.0 -04 05 18.7 95.63 96.57 161 Cet
12 Nov 01 39.5 -04 06 18.7 95.72 96.57 150 Cet
26 Nov 01 39.0 -04 07 18.7 95.85 96.57 136 Cet
10 Dec 01 38.7 -04 07 18.8 96.03 96.57 123 Cet
24 Dec 01 38.4 -04 06 18.8 96.24 96.57 109 Cet
*********************************************************
*********************************************************
0h UT (J2000) Mag Δ r El. Con
DATE R.A. Decl. V A.U. A.U. o
hh mm.m o '
*********************************************************
07 Jan 01 38.2 -04 05 18.8 96.47 96.56 095 Cet
21 Jan 01 38.2 -04 02 18.8 96.70 96.56 081 Cet
04 Feb 01 38.3 -03 59 18.8 96.93 96.56 068 Cet
18 Feb 01 38.6 -03 55 18.8 97.13 96.56 054 Cet
03 Mar 01 38.9 -03 51 18.8 97.30 96.55 041 Cet
17 Mar 01 39.4 -03 47 18.8 97.43 96.55 028 Cet
31 Mar 01 39.9 -03 43 18.7 97.50 96.55 017 Cet
14 Apr 01 40.4 -03 39 18.7 97.52 96.55 013 Cet
28 Apr 01 41.0 -03 35 18.8 97.49 96.54 020 Cet
12 May 01 41.5 -03 33 18.8 97.40 96.54 032 Cet
26 May 01 42.0 -03 31 18.8 97.26 96.54 044 Cet
09 Jun 01 42.3 -03 29 18.8 97.09 96.54 057 Cet
23 Jun 01 42.7 -03 29 18.8 96.88 96.53 070 Cet
07 Jul 01 42.8 -03 29 18.8 96.65 96.53 083 Cet
21 Jul 01 42.9 -03 30 18.8 96.42 96.53 096 Cet
04 Aug 01 42.9 -03 32 18.8 96.20 96.53 109 Cet
18 Aug 01 42.7 -03 35 18.8 95.99 96.52 122 Cet
01 Sep 01 42.4 -03 37 18.7 95.81 96.52 135 Cet
15 Sep 01 42.0 -03 40 18.7 95.67 96.52 148 Cet
29 Sep 01 41.6 -03 43 18.7 95.58 96.52 159 Cet
13 Oct 01 41.1 -03 46 18.7 95.54 96.51 167 Cet
27 Oct 01 40.5 -03 49 18.7 95.57 96.51 162 Cet
10 Nov 01 40.0 -03 51 18.7 95.64 96.51 151 Cet
24 Nov 01 39.6 -03 52 18.7 95.77 96.51 138 Cet
08 Dec 01 39.2 -03 52 18.8 95.95 96.50 124 Cet
22 Dec 01 38.9 -03 51 18.8 96.15 96.50 111 Cet
*********************************************************
*********************************************************
0h UT (J2000) Mag Δ r El. Con
DATE R.A. Decl. V A.U. A.U. o
hh mm.m o '
*********************************************************
05 Jan 01 38.8 -03 49 18.8 96.38 96.50 097 Cet
19 Jan 01 38.7 -03 47 18.8 96.62 96.50 083 Cet
02 Feb 01 38.8 -03 44 18.8 96.84 96.49 069 Cet
16 Feb 01 39.1 -03 40 18.8 97.05 96.49 055 Cet
02 Mar 01 39.4 -03 36 18.8 97.22 96.49 042 Cet
16 Mar 01 39.8 -03 32 18.8 97.35 96.49 029 Cet
30 Mar 01 40.3 -03 28 18.7 97.43 96.48 018 Cet
13 Apr 01 40.9 -03 24 18.7 97.46 96.48 013 Cet
27 Apr 01 41.4 -03 20 18.7 97.43 96.48 019 Cet
11 May 01 41.9 -03 18 18.8 97.35 96.48 031 Cet
25 May 01 42.4 -03 15 18.8 97.21 96.47 043 Cet
08 Jun 01 42.8 -03 14 18.8 97.04 96.47 056 Cet
22 Jun 01 43.1 -03 13 18.8 96.84 96.47 068 Cet
06 Jul 01 43.3 -03 14 18.8 96.61 96.47 081 Cet
20 Jul 01 43.4 -03 15 18.8 96.38 96.46 094 Cet
03 Aug 01 43.4 -03 16 18.8 96.15 96.46 107 Cet
17 Aug 01 43.2 -03 19 18.8 95.94 96.46 120 Cet
31 Aug 01 42.9 -03 22 18.7 95.76 96.46 133 Cet
14 Sep 01 42.6 -03 25 18.7 95.62 96.45 146 Cet
28 Sep 01 42.1 -03 28 18.7 95.52 96.45 158 Cet
12 Oct 01 41.6 -03 30 18.7 95.48 96.45 166 Cet
26 Oct 01 41.1 -03 33 18.7 95.49 96.45 163 Cet
09 Nov 01 40.6 -03 35 18.7 95.57 96.44 152 Cet
23 Nov 01 40.1 -03 36 18.7 95.69 96.44 139 Cet
07 Dec 01 39.7 -03 36 18.8 95.86 96.44 126 Cet
21 Dec 01 39.4 -03 36 18.8 96.06 96.44 112 Cet
*********************************************************
*********************************************************
0h UT (J2000) Mag Δ r El. Con
DATE R.A. Decl. V A.U. A.U. o
hh mm.m o '
*********************************************************
04 Jan 01 39.3 -03 34 18.8 96.29 96.43 098 Cet
18 Jan 01 39.2 -03 32 18.8 96.53 96.43 084 Cet
01 Feb 01 39.3 -03 29 18.8 96.76 96.43 070 Cet
15 Feb 01 39.5 -03 25 18.8 96.96 96.43 057 Cet
01 Mar 01 39.9 -03 21 18.8 97.14 96.42 043 Cet
15 Mar 01 40.3 -03 17 18.8 97.28 96.42 030 Cet
29 Mar 01 40.8 -03 13 18.7 97.36 96.42 019 Cet
12 Apr 01 41.3 -03 09 18.7 97.39 96.42 013 Cet
26 Apr 01 41.9 -03 05 18.7 97.37 96.41 018 Cet
10 May 01 42.4 -03 02 18.8 97.29 96.41 029 Cet
24 May 01 42.9 -03 00 18.8 97.16 96.41 042 Cet
07 Jun 01 43.3 -02 59 18.8 97.00 96.41 054 Cet
21 Jun 01 43.6 -02 58 18.8 96.79 96.40 067 Cet
05 Jul 01 43.8 -02 58 18.8 96.57 96.40 080 Cet
19 Jul 01 43.9 -02 59 18.8 96.34 96.40 093 Cet
02 Aug 01 43.9 -03 01 18.8 96.11 96.40 106 Cet
16 Aug 01 43.7 -03 03 18.8 95.90 96.39 119 Cet
30 Aug 01 43.5 -03 06 18.7 95.71 96.39 132 Cet
13 Sep 01 43.1 -03 09 18.7 95.56 96.39 145 Cet
27 Sep 01 42.7 -03 12 18.7 95.46 96.38 157 Cet
11 Oct 01 42.2 -03 15 18.7 95.41 96.38 166 Cet
25 Oct 01 41.6 -03 17 18.7 95.42 96.38 164 Cet
08 Nov 01 41.1 -03 19 18.7 95.49 96.38 154 Cet
22 Nov 01 40.7 -03 20 18.7 95.61 96.37 141 Cet
06 Dec 01 40.3 -03 21 18.7 95.77 96.37 127 Cet
20 Dec 01 40.0 -03 20 18.8 95.97 96.37 113 Cet
*********************************************************
Min-Max values: 2006-2015
****************************
Mag Δ r
Min 18.8 97.8 96.9
Max 18.7 95.4 96.4
Mean 18.8 96.7 96.6
****************************
************************ Opposition Conjunction ************************ xx Aug xxxx xx May xxxx *************************
Eris and Pluto : 1800-2200
************************************************
Mag. Mag. r Delta Elong L b
Min 18.8 16.0 97.6 98.5 178.8 360.0 40.9
Max 16.1 13.7 52.0 51.3 0.7 0.0 -44.6
Mean 18.2 15.3 84.7 84.7 89.3 129.8 -11.8
************************************************
Eris Pluto Eris-->
The user applying this data for any purpose forgoes any liability against the author. None of the information should be used for regarding either legal or medical purposes. Although the data is accurate as possible some errors might be present. The onus of its use is place solely with the user.
