55 Andromedae
55 Andromedae, abbreviated 55 And, is a single,[7] orange-hued star in the northern constellation of Andromeda. 55 Andromedae is the Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 5.42.[2] Based upon an annual parallax shift of 4.7 mas,[1] it is located about 730 light years from the Sun. 55 And is moving closer to the Earth with a heliocentric radial velocity of −7.6 km/s.[5] It is a member of the Sirius supercluster.[8]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 01h 53m 17.34441s[1] |
| Declination | +40° 43′ 47.2538″[1] |
| Apparent magnitude (V) | 5.42[2] |
| Characteristics | |
| Spectral type | K1 III[3] |
| U−B color index | +1.41[4] |
| B−V color index | +1.32[4] |
| Astrometry | |
| Radial velocity (Rv) | −7.59±0.2[5] km/s |
| Proper motion (μ) | RA: −10.073[1] mas/yr Dec.: −4.483[1] mas/yr |
| Parallax (π) | 4.4619 ± 0.1001 mas[1] |
| Distance | 730 ± 20 ly (224 ± 5 pc) |
| Absolute magnitude (MV) | −1.00[2] |
| Details | |
| Luminosity | 436.43[2] L☉ |
| Surface gravity (log g) | 2.30[3] cgs |
| Temperature | 4,290[3] K |
| Metallicity [Fe/H] | −0.14[3] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an aging giant star with a stellar classification of K1 III,[3] which indicates it has exhausted the hydrogen supply at its core and evolved away from the main sequence. It is radiating 436[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,290 K.[3] It has a magnitude 10.90 visual companion at an angular separation of 59.00″ along a position angle of 357° from 55 And. In 1828, this separation was just 20.0″.[9]
References edit
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
- ^ a b c d e Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b c d e f McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527.
- ^ a b Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society, 133 (4): 475–493, Bibcode:1966MNRAS.133..475A, doi:10.1093/mnras/133.4.475.
- ^ a b Famaey, B.; et al. (2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430: 165, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304.
- ^ "55 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 1, 2018.
- ^ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ Eggen, Olin J. (October 1996), "Star Streams and Galactic Structure", Astronomical Journal, 112: 1595, Bibcode:1996AJ....112.1595E, doi:10.1086/118126.
- ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
External links edit
- Image 55 Andromedae