IRIS was discovered from London on the 13th August by J.R.Hind. This was in the same year as 6 Hebe and 8 Flora in 1847, and became the seventh known asteroid.
IRIS DATADiscoverer : Date : Satellites : Diameter : km. Polar Tilt :o Period (P) : years Synodic Period : days Orbital Velocity : kms-1 Perihelion (q) : A.U. Aphelion (Q) : A.U. Eccentricity (e) : Inclination (i) : o Mass : x10 kg. Mean Density : g.cm-3 Mean Distance : AU or 4.157 x 108 km Sidereal Rotation : hr. Mean Sidereal Rotation : d. Maximum Diameter : ″ (arcsec) Minimum Diameter : ″ (arcsec) Maximum Magnitude : Minimum Magnitude : |
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0h UT (J2000) Mag Δ r El. Con
DATE R.A. Decl. V A.U. A.U. o
hh mm.m o '
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14 Jan 20 01.8 -17 50 10.3 3.367 2.391 006 Sgr
28 Jan 20 29.2 -16 10 10.2 3.337 2.355 004 Cap
11 Feb 20 56.7 -14 12 10.3 3.284 2.318 010 Aqr
25 Feb 21 24.0 -11 58 10.4 3.210 2.281 017 Aqr
11 Mar 21 51.1 -09 28 10.4 3.118 2.244 024 Cap
25 Mar 22 18.0 -06 46 10.4 3.009 2.207 030 Aqr
08 Apr 22 44.7 -03 53 10.4 2.885 2.170 037 Aqr
22 Apr 23 11.1 +00 51 10.3 2.750 2.134 043 Psc
06 May 23 37.5 +02 14 10.3 2.606 2.099 050 Psc
20 May 00 03.8 +05 23 10.2 2.454 2.064 056 Psc
03 Jun 00 30.0 +08 31 10.0 2.298 2.031 062 Psc
17 Jun 00 56.1 +11 36 09.9 2.138 1.999 068 Psc
01 Jul 01 22.0 +14 33 09.8 1.977 1.969 075 Psc
15 Jul 01 47.5 +17 18 09.6 1.817 1.942 081 Ari
29 Jul 02 12.3 +19 50 09.4 1.659 1.917 088 Ari
12 Aug 02 35.7 +22 03 09.2 1.505 1.894 096 Ari
26 Aug 02 56.8 +23 54 08.9 1.358 1.875 104 Ari
09 Sep 03 14.4 +25 20 08.6 1.219 1.859 113 Ari
23 Sep 03 26.9 +26 16 08.3 1.093 1.847 123 Ari
07 Oct 03 32.6 +26 36 07.9 0.986 1.839 136 Tau
21 Oct 03 30.7 +26 14 07.5 0.904 1.834 150 Tau
04 Nov 03 22.0 +25 03 07.1 0.857 1.834 165 Ari
18 Nov 03 10.2 +23 12 06.8 0.852 1.837 173 Ari
02 Dec 03 00.4 +21 10 07.3 0.890 1.844 159 Ari
16 Dec 02 56.5 +19 28 07.7 0.970 1.856 144 Ari
30 Dec 03 00.0 +18 26 08.2 1.082 1.870 130 Ari
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0h UT (J2000) Mag Δ r El. Con
DATE R.A. Decl. V A.U. A.U. o
hh mm.m o '
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13 Jan 03 10.2 +18 04 08.5 1.218 1.889 118 Ari
27 Jan 03 25.9 +18 14 08.9 1.372 1.910 107 Tau
10 Feb 03 45.9 +18 44 09.2 1.537 1.934 098 Tau
24 Feb 04 09.1 +19 22 09.5 1.709 1.961 089 Tau
10 Mar 04 34.7 +19 59 09.7 1.886 1.990 081 Tau
24 Mar 05 02.1 +20 28 09.9 2.063 2.022 074 Tau
07 Apr 05 30.6 +20 43 10.0 2.238 2.054 066 Tau
21 Apr 05 59.8 +20 41 10.2 2.409 2.089 060 Ori
05 May 06 29.3 +20 21 10.3 2.574 2.124 053 Gem
19 May 06 58.8 +19 41 10.4 2.730 2.160 046 Gem
02 Jun 07 28.0 +18 42 10.4 2.876 2.196 040 Gem
16 Jun 07 56.6 +17 24 10.5 3.009 2.233 033 Cnc
30 Jun 08 24.6 +15 50 10.5 3.128 2.270 027 Cnc
14 Jul 08 51.8 +14 01 10.5 3.231 2.307 021 Cnc
28 Jul 09 18.3 +12 00 10.4 3.315 2.344 014 Cnc
11 Aug 09 43.9 +09 48 10.4 3.381 2.381 008 Leo
25 Aug 10 08.6 +07 29 10.3 3.424 2.417 004 Leo
08 Sep 10 32.6 +05 04 10.5 3.446 2.452 008 Sex
22 Sep 10 55.8 +02 35 10.6 3.443 2.486 015 Leo
06 Oct 11 18.1 +00 06 10.8 3.417 2.520 022 Leo
20 Oct 11 39.6 -02 21 10.9 3.365 2.552 030 Vir
03 Nov 12 00.2 -04 45 11.0 3.288 2.584 038 Vir
17 Nov 12 19.7 -07 04 11.0 3.187 2.615 047 Vir
01 Dec 12 37.9 -09 15 11.0 3.065 2.644 056 Vir
15 Dec 12 54.5 -11 16 11.0 2.922 2.672 066 Vir
29 Dec 13 09.0 -13 04 10.9 2.764 2.699 076 Vir
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0h UT (J2000) Mag Δ r El. Con
DATE R.A. Decl. V A.U. A.U. o
hh mm.m o '
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12 Jan 13 20.9 -14 37 10.8 2.595 2.725 087 Vir
26 Jan 13 29.4 -15 51 10.7 2.422 2.749 099 Vir
09 Feb 13 33.8 -16 43 10.5 2.254 2.772 111 Vir
23 Feb 13 33.5 -17 07 10.3 2.101 2.793 125 Vir
08 Mar 13 28.1 -16 59 10.0 1.976 2.813 140 Vir
22 Mar 13 18.2 -16 15 09.7 1.891 2.832 156 Vir
05 Apr 13 05.6 -15 00 09.5 1.857 2.849 171 Vir
19 Apr 12 52.8 -13 27 09.6 1.879 2.864 166 Crv
03 May 12 42.4 -11 53 09.9 1.956 2.879 151 Crv
17 May 12 36.0 -10 35 10.2 2.079 2.891 136 Vir
31 May 12 34.2 -09 44 10.5 2.238 2.902 122 Vir
14 Jun 12 36.8 -09 22 10.7 2.420 2.912 109 Vir
28 Jun 12 43.2 -09 27 10.9 2.615 2.920 097 Vir
12 Jul 12 52.7 -09 56 11.1 2.814 2.926 086 Vir
26 Jul 13 04.9 -10 44 11.2 3.009 2.931 076 Vir
09 Aug 13 19.2 -11 46 11.3 3.195 2.935 066 Vir
23 Aug 13 35.2 -12 59 11.4 3.367 2.936 057 Vir
06 Sep 13 52.7 -14 18 11.4 3.520 2.937 048 Vir
20 Sep 14 11.5 -15 42 11.4 3.650 2.935 039 Vir
04 Oct 14 31.3 -17 06 11.4 3.756 2.933 030 Lib
18 Oct 14 52.1 -18 27 11.3 3.834 2.928 021 Lib
01 Nov 15 13.7 -19 44 11.2 3.883 2.922 013 Lib
15 Nov 15 36.0 -20 54 11.0 3.900 2.915 004 Lib
29 Nov 15 58.9 -21 55 11.0 3.887 2.906 005 Sco
13 Dec 16 22.0 -22 45 11.1 3.842 2.895 014 Sco
27 Dec 16 45.2 -23 23 11.2 3.766 2.883 023 Oph
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0h UT (J2000) Mag Δ r El. Con
DATE R.A. Decl. V A.U. A.U. o
hh mm.m o '
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10 Jan 17 08.3 -23 48 11.3 3.661 2.869 032 Oph
24 Jan 17 30.9 -24 00 11.3 3.528 2.854 041 Oph
07 Feb 17 52.7 -23 58 11.3 3.371 2.838 050 Sgr
21 Feb 18 13.4 -23 45 11.2 3.193 2.820 059 Sgr
07 Mar 18 32.4 -23 22 11.1 2.998 2.800 069 Sgr
21 Mar 18 49.4 -22 51 11.0 2.791 2.779 079 Sgr
04 Apr 19 03.8 -22 14 10.8 2.578 2.757 089 Sgr
18 Apr 19 14.9 -21 35 10.6 2.364 2.733 101 Sgr
02 May 19 22.1 -20 57 10.4 2.157 2.708 112 Sgr
16 May 19 24.5 -20 24 10.1 1.966 2.681 125 Sgr
30 May 19 21.5 -19 58 09.7 1.800 2.654 139 Sgr
13 Jun 19 13.1 -19 39 09.4 1.671 2.625 155 Sgr
27 Jun 19 00.2 -19 26 08.9 1.586 2.594 171 Sgr
11 Jul 18 45.1 -19 17 08.9 1.554 2.563 171 Sgr
25 Jul 18 31.2 -19 08 09.2 1.574 2.531 155 Sgr
08 Aug 18 21.2 -19 02 09.4 1.639 2.498 139 Sgr
22 Aug 18 16.9 -18 59 09.7 1.740 2.464 125 Sgr
05 Sep 18 18.8 -18 58 09.9 1.865 2.429 112 Sgr
19 Sep 18 26.3 -18 57 10.1 2.002 2.393 100 Sgr
03 Oct 18 38.7 -18 51 10.2 2.144 2.357 089 Sgr
17 Oct 18 55.2 -18 36 10.3 2.284 2.320 080 Sgr
31 Oct 19 15.0 -18 08 10.4 2.417 2.283 070 Sgr
14 Nov 19 37.5 -17 25 10.4 2.539 2.246 062 Sgr
28 Nov 20 02.0 -16 22 10.4 2.648 2.209 054 Sgr
12 Dec 20 28.0 -15 00 10.4 2.741 2.173 046 Cap
26 Dec 20 55.3 -13 17 10.3 2.817 2.137 038 Aqr
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0h UT (J2000) Mag Δ r El. Con
DATE R.A. Decl. V A.U. A.U. o
hh mm.m o '
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09 Jan 21 23.4 -11 13 10.2 2.877 2.101 031 Aqr
23 Jan 21 52.1 -08 51 10.1 2.919 2.067 025 Cap
06 Feb 22 21.3 -06 11 10.0 2.946 2.034 018 Aqr
20 Feb 22 51.0 -03 16 09.8 2.957 2.002 012 Aqr
06 Mar 23 21.1 -00 11 09.7 2.953 1.972 007 Psc
20 Mar 23 51.6 +03 01 09.5 2.937 1.945 004 Psc
03 Apr 00 22.7 +06 16 09.6 2.910 1.920 006 Psc
17 Apr 00 54.4 +09 31 09.7 2.873 1.897 011 Psc
01 May 01 27.0 +12 39 09.7 2.827 1.878 016 Psc
15 May 02 00.4 +15 35 09.8 2.773 1.862 021 Ari
29 May 02 34.7 +18 15 09.8 2.713 1.850 025 Ari
12 Jun 03 09.8 +20 32 09.8 2.646 1.841 030 Ari
26 Jun 03 45.7 +22 24 09.8 2.574 1.837 035 Tau
10 Jul 04 21.9 +23 45 09.8 2.496 1.836 040 Tau
24 Jul 04 58.1 +24 34 09.8 2.412 1.839 045 Tau
07 Aug 05 33.7 +24 51 09.8 2.322 1.846 050 Tau
21 Aug 06 08.3 +24 35 09.8 2.226 1.857 056 Gem
04 Sep 06 41.1 +23 50 09.8 2.123 1.872 062 Gem
18 Sep 07 11.7 +22 40 09.7 2.014 1.890 068 Gem
02 Oct 07 39.4 +21 11 09.6 1.898 1.911 075 Gem
16 Oct 08 03.7 +19 29 09.5 1.777 1.935 083 Cnc
30 Oct 08 23.8 +17 42 09.4 1.652 1.961 092 Cnc
13 Nov 08 39.1 +15 57 09.2 1.528 1.990 102 Cnc
27 Nov 08 48.5 +14 25 09.0 1.410 2.021 114 Cnc
11 Dec 08 51.1 +13 12 08.7 1.304 2.054 127 Cnc
25 Dec 08 46.5 +12 26 08.4 1.223 2.088 142 Cnc
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0h UT (J2000) Mag Δ r El. Con
DATE R.A. Decl. V A.U. A.U. o
hh mm.m o '
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08 Jan 08 35.3 +12 11 08.1 1.178 2.123 158 Cnc
22 Jan 08 20.3 +12 22 07.9 1.179 2.158 172 Cnc
05 Feb 08 05.6 +12 49 08.2 1.232 2.195 164 Cnc
19 Feb 07 55.3 +13 20 08.7 1.333 2.232 148 Gem
05 Mar 07 51.2 +13 46 09.1 1.474 2.269 133 Gem
19 Mar 07 53.5 +14 01 09.5 1.646 2.305 120 Gem
02 Apr 08 01.3 +14 02 09.8 1.836 2.342 108 Cnc
16 Apr 08 13.5 +13 47 10.1 2.039 2.378 097 Cnc
30 Apr 08 28.7 +13 15 10.3 2.246 2.414 087 Cnc
14 May 08 46.2 +12 26 10.5 2.453 2.449 078 Cnc
28 May 09 05.3 +11 22 10.7 2.654 2.484 069 Cnc
11 Jun 09 25.4 +10 03 10.8 2.847 2.517 061 Leo
25 Jun 09 46.1 +08 32 10.9 3.028 2.550 053 Leo
09 Jul 10 07.2 +06 48 11.0 3.194 2.581 045 Leo
23 Jul 10 28.5 +04 55 11.0 3.343 2.612 038 Sex
06 Aug 10 49.9 +02 54 11.0 3.471 2.641 030 Sex
20 Aug 11 11.3 +00 46 11.0 3.577 2.669 022 Leo
03 Sep 11 32.7 -01 24 10.9 3.659 2.696 015 Leo
17 Sep 11 53.9 -03 38 10.8 3.715 2.722 008 Vir
01 Oct 12 15.0 -05 53 10.8 3.744 2.746 004 Vir
15 Oct 12 36.0 -08 05 10.9 3.744 2.769 010 Vir
29 Oct 12 56.7 -10 15 11.1 3.716 2.791 018 Vir
12 Nov 13 17.1 -12 20 11.2 3.658 2.811 027 Vir
26 Nov 13 37.0 -14 18 11.3 3.572 2.830 036 Vir
10 Dec 13 56.1 -16 08 11.3 3.459 2.847 045 Vir
24 Dec 14 14.3 -17 47 11.3 3.321 2.863 054 Vir
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0h UT (J2000) Mag Δ r El. Con
DATE R.A. Decl. V A.U. A.U. o
hh mm.m o '
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07 Jan 14 31.2 -19 16 11.2 3.162 2.877 064 Lib
21 Jan 14 46.1 -20 32 11.2 2.986 2.890 075 Lib
04 Feb 14 58.6 -21 35 11.1 2.799 2.901 086 Lib
18 Feb 15 07.9 -22 24 10.9 2.607 2.911 098 Lib
03 Mar 15 13.2 -22 55 10.7 2.420 2.919 111 Lib
17 Mar 15 13.7 -23 08 10.5 2.248 2.925 124 Lib
31 Mar 15 09.2 -22 58 10.2 2.102 2.931 139 Lib
14 Apr 14 59.9 -22 22 09.9 1.995 2.934 155 Lib
28 Apr 14 47.3 -21 21 09.6 1.938 2.936 171 Lib
12 May 14 33.8 -20 02 09.6 1.937 2.937 170 Lib
26 May 14 22.0 -18 40 09.9 1.991 2.936 154 Lib
09 Jun 14 13.9 -17 28 10.2 2.094 2.933 139 Vir
23 Jun 14 10.5 -16 38 10.5 2.234 2.929 124 Vir
07 Jul 14 11.7 -16 13 10.7 2.399 2.923 111 Vir
21 Jul 14 17.1 -16 13 10.9 2.579 2.916 099 Vir
04 Aug 14 26.2 -16 32 11.1 2.764 2.907 088 Lib
18 Aug 14 38.3 -17 08 11.2 2.946 2.897 077 Lib
01 Sep 14 53.0 -17 54 11.2 3.119 2.885 067 Lib
15 Sep 15 09.8 -18 47 11.3 3.278 2.872 058 Lib
29 Sep 15 28.6 -19 42 11.3 3.418 2.857 049 Lib
13 Oct 15 48.9 -20 35 11.3 3.536 2.841 040 Sco
27 Oct 16 10.6 -21 24 11.2 3.629 2.823 031 Sco
10 Nov 16 33.4 -22 05 11.1 3.695 2.803 022 Oph
24 Nov 16 57.2 -22 36 11.0 3.733 2.783 014 Oph
08 Dec 17 21.8 -22 54 10.8 3.741 2.761 005 Oph
22 Dec 17 46.8 -22 58 10.7 3.719 2.737 003 Sgr
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************************ Opposition Conjunction ************************ 05 Aug 2006 26 May 2007 *************************
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.
