Basic object information

Name: M 82
Type of object: Galaxy
Magnitude: 9.2
Surface brightness: 11.8 mag/sq arcmin
Size: 10.5'x5.1'
Position angle: 65°

Position (epoch of date)

Right ascension: 9h 56m 12s
Declination: +69° 40' 20"
Constellation: Ursa Major

Local information

Altitude:  21° 34' 31"
Azimuth: 355° 0' 33"

Transit: 22h 36m 48s

Star atlas chart numbers:

Herald-Bobroff Astroatlas, Chart C-13
Millennium Star Atlas, Charts 537-538 (Vol II)
Sky Atlas 2000.0, Chart 2
Uranometria 2000 Chart 23, Vol 1


Revised NGC/IC Catalog Data

Wolfgang Steinicke, Feb 2001

Names and designations

M 82
PGC 28655
NGC 3034
UGC 5322
MCG 12-10-11
IRAS09517+6954
KCPG 218B
ZWG 333.8

Type of object: Galaxy

Catalog position for epoch J2000.0

Right ascension:	09h 55m 54.0s
Declination:		+69° 40' 57"


Object information

Magnitude: 9.2
Size: 10.5'x5.1'
Position angle: 65°

Object classification: Sd      
Remarks: ARP 337, 3C 231, Ursa Major A

Saguaro Astronomy Club v7.2 Catalog Data

Saguaro Astronomy Club, August 2000

Names and designations

M 82
NGC 3034

Type of object: Galaxy

Catalog position for epoch J2000.0

Right ascension:	09h 55m 54.0s
Declination:		+69° 40' 57"

Constellation: Ursa Major

Object information

Magnitude: 8.4
Size: 10.5'x5.1'
Position angle: 65°

Object classification: Sd
Description: vB,vL,vmE(ray)
Notes: M81 group;eruptive;H IV 79

LEDA Catalog Data

Lyon-Meudon Extragalactic Database (LEDA) supplied by the LEDA team at the CRAL-Observatoire de Lyon (France)

Names and designations

PGC 28655
MESS 82
NGC 3034
UGC 5322
MCG 12-10- 11
CGCG 333- 8
IRAS09517+6954
ARP 337
KCPG 218B

Position information

Right ascension (J2000.0):	09h 55m 54.0s
Declination (J2000.0):		+69° 40' 57"
(Coordinates have high accuracy)

Galactic longitude:	141.40°
Galactic latitude:	40.57°

Supergalactic longitude:	40.38°
Supergalactic latitude:	1.06°

Size and shape information

Apparent major isophotal diameter (D25): 10.5'
Mean error in log10 diameter: 0.060
Ratio of major to minor axes (R25): 2.38
Mean error in log10 R25: 0.127
Major axis position angle: 65°
Inclination between line of sight and polar axis: 86.526°
Apparent corrected diameter: 10.9'
Lyon galaxy group membership number: 176

Morphological information

Morphological type: Sd    
Morphological type code: 7.857
Error in morphological type code: 3.558

Magnitude and colour index information

Total B magnitude: 9.162
Error in B magnitude: 0.259
Mean surface brightness: 20.686 mag/sq arcsec
Error in surface brightness: 0.490 mag/sq arcsec
Total U-B colour index: 0.310
Total B-V colour index: 0.890
Effective U-B colour index: 0.420
Effective B-V colour index: 0.915
21cm line width at 20% of peak (w20): 214.052 km/sec
Error in w20: 33.202 km/sec
21cm line width at 50% of peak (w50): 145.960 km/sec
Error in w50: 5.814 km/sec
Central velocity dispersion: 100 km/sec
Error in log10 velocity dispersion: 0.014
21cm line flux in magnitude: 11.538
Error in 21cm line flux in magnitude: 0.363
Far infrared magnitude: 5.584
Galactic extinction in B mag: 0.325 mag
Extinction in B mag due to inclination: 0.685 mag
21cm self-absorption in magnitude: 0.266 mag
Total apparent corrected B mag: 8.151
Total apparent corrected U-B colour index: 0.176
Total apparent corrected B-V colour index: 0.746
Mean surface brightness within isophote 25: 22.242 mag/sq arcsec
Maximum rotational velocity: 75.9 km/sec
Error in log10 rotational velocity: 0.056
Corrected 21cm line flux in magnitude: 11.272
21cm index bt-am21c in magnitude. 3.121

Radial velocity information

Heliocentric RV from radio measurements: 202.6 km/sec
Error in radio measurements: 19.4 km/sec
Heliocentric RV from optical measurements: 267.8 km/sec
Error in optical measurements: 39.8 km/sec
Mean heliocentric RV: 215.1 km/sec
Error in mean measurements: 17.4 km/sec
RV with respect to local group: 377.6 km/sec
RV with respect to GSR: 324.2 km/sec
RV corrected for infall of LG onto Virgo: 452.9 km/sec
RV with respect to the 3K CMB: 297.1 km/sec
Absolute B magnitude: -18.523