Mu Canis Majoris

μ Canis Majoris

Location of μ Canis Majoris (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Canis Major
Right ascension	06^h 56^m 06.65^s[1]
Declination	−14° 02′ 36.4″[1]
Apparent magnitude (V)	5 (naked eye)[2]
Characteristics
Evolutionary stage	Giant
Spectral type	K3III (A)[2] B9.5V (B)[3]
Astrometry
Distance	~910 ly (~278[4] pc)
Other designations
μ Canis Majoris, μ CMa, Mu CMa, 18 Canis Majoris, 18 CMa, HR 2593, BD−13°1741, HD 51250, HIP 33345
Database references
SIMBAD	data

Mu Canis Majoris (μ Canis Majoris, 18 Canis Majoris), also known as HR 2593 and BD-13°1741; is a quadruple star complex located in the constellation Canis Major. The multiple star is located at right ascension 06^h 56^m 06.65^s and declination −14° 02′ 36.4″.^[1][5] The brighter two components can be split in a small telescope.^[6]The star system is estimated to be 278 parsecs (910 light-years) from the Sun.^[4] The star has the traditional names Isida and Isis.^[4][7]

Associated stars

^[1][8]

Mu Canis Majoris A (HD 51250)

(06^h 56^m 06.64589^s,−14° 02′ 36.3520″) A K3III giant star with a naked eye apparent magnitude of 5,^[2] and an absolute magnitude of -2.22. Mu Canis Majoris has a mass of 3.1 Solar masses. Mu CMa is about 390 times fainter than the brightest star in the night sky Sirius.^{[NB 1]}

Mu Canis Majoris B (HD 51251)

(06^h 56^m 06.4^s,−14° 02′ 31″) A B9.5V star with an apparent magnitude of 7.6.^[3]

Mu Canis Majoris C (BD-13°1741 C)

(06^h 56^m 00.9922^s,−14° 02′ 08.861″) A star with an apparent magnitude of 10.2 ^[9]

Mu Canis Majoris D (BD-13°1741 D)

(06^h 56^m 13.0466^s,−14° 01′ 48.272″) a star with an apparent magnitude of 10.5 ^[10]

Mu CMa should not be confused with the 9th magnitude variable star MU CMa located near NGC 2360.^[11]

See also

• Star portal
• Astronomy portal

Notes

1. Calculation: ${\displaystyle ({\sqrt[{5}]{100}})^{5--1.47}\approx 387}$

References

1. "CCDM J06561-1402". SIMBAD Astronomical Database. Retrieved 2012-06-02.
2. "HD 51250". SIMBAD Astronomical Database. Retrieved 2012-06-02.
3. "HD 51251". SIMBAD Astronomical Database. Retrieved 2012-06-02.
4. "μ CMa (Isis)". Wikisky. Retrieved 2012-06-02.
5. "HR 2593". Vizier. Centre de Données astronomiques de Strasbourg. Retrieved 2012-06-02.
6. Consolmagno, Guy (2011). Turn Left at Orion: Hundreds of Night Sky Objects to See in a Home Telescope – and How to Find Them. Cambridge, United Kingdom: Cambridge University Press. p. 81. ISBN 1-139-50373-1.
7. "Isida (HIP 33345)". Ashland Astronomy Studio. Retrieved 2012-06-06.
8. "CCDM J06561-1402A". SIMBAD Astronomical Database. Retrieved 2012-06-02.
9. "BD-13 1741C". SIMBAD Astronomical Database. Retrieved 2012-06-02.
10. "BD-13 1741D". SIMBAD Astronomical Database. Retrieved 2012-06-02.
11. "International variable star Index: MU CMa". AAVSO. Retrieved 2012-06-03.

External links

• Mu Canis Majoris on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
• WikiSky, μ CMa (Isis)
• Alcyone, μ Canis Majoris