Eta Canis Majoris
Sign in to saveAlso known as Aludra, 31 Canis Majoris, HD 58350, eta CMa, 31 CMa, η CMa, η Canis Majoris, HR 2827
star in the constellation Canis Major
Astronomical data · SIMBAD
- Object type
- s*b
- Spectral type
- B5Ia
- Distance
- 1,989 light-years
- Redshift
- z = 0.00013710424191293313
- Coordinates
- RA 111.0238° · Dec -29.3031°
via SIMBAD · CDS Strasbourg
Key facts
- Constellation
- Canis Major
- Right ascension
- 07 24 05.70228
- Declination
- −29 ° 18 ′ 11.1798 ″
- Apparent magnitude v
- 2.38 – 2.48
- Evolutionary stage
- Blue supergiant , likely a post- red supergiant
- Spectral type
- B5 Ia
- U b color index
- −0.708
- B v color index
- −0.087
- Variable type
- α Cyg
via Wikipedia infobox
Wikidata facts
- Instance of
- optical double
- Constellation
- Canis Major
- Radius
- 56.3
- Variable-star type
- Alpha Cygni variable
- Image
- Eta CMa.jpg
Show 15 more facts
- absolute magnitude
- -7.0
- spectral class
- B5p
- catalog code
- ALS 14888
- stellar rotational velocity
- 36
- right ascension component of proper motion
- -3.76
- apparent magnitude
- 2.450408
- right ascension
- 111.023759501
- declination
- -29.303105508
- effective temperature
- 12670
- radial velocity
- 39.0
- declination component of proper motion
- 4
- parallax
- 1.64
- epoch
- J2000.0
- age estimated by a dating method
- 8.3
- Commons category
- Eta Canis Majoris
Sources (3)
via Wikidata · CC0
~3 min read
Encyclopedic overview
Eta Canis Majoris is a blue supergiant star in the constellation of Canis Major. It has the proper name Aludra, pronounced /əˈluːdrə, əˈljuːdrə/; Eta Canis Majoris is its Bayer designation. This star has an apparent visual magnitude that varies between 2.38 and 2.48, which makes it the fifth-brightest in the constellation. Parallax measurements from the Hipparcos mission estimate a large distance of 2,000 light-years. It is drifting further away from the Sun with a line of sight velocity of 41 km/s.
Nomenclature
Excerpted from Wikipedia’s “Eta Canis Majoris” article, available under the CC BY-SA 4.0 licence.