7 Andromedae

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7 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  23h 12m 33.00460s[1]
Declination +49° 24′ 22.3299″[1]
Apparent magnitude (V) 4.52[2]
Spectral type F1V[3]
U−B color index +0.01[4]
B−V color index +0.28[4]
Radial velocity (Rv)12.10±1[5] km/s
Proper motion (μ) RA: 89.292[1] mas/yr
Dec.: 96.696[1] mas/yr
Parallax (π)40.9812 ± 0.2307[1] mas
Distance79.6 ± 0.4 ly
(24.4 ± 0.1 pc)
Absolute magnitude (MV)2.58[6]
Mass1.6 ± 0.1 M
Radius1.71 ± 0.02 R
Luminosity7.8 ± 0.6 L
Surface gravity (log g)4.16 ± 0.02 cgs
Temperature7,380 ± 90 K
Metallicity [Fe/H]-0.02 ± 0.08 dex
Rotational velocity (v sin i)61 ± 6 km/s
Age1120 ± 30 Myr
Other designations
7 And, BD+48° 3964, FK5 3852, HD 219080, HIP 114570, HR 8830, SAO 52787[8]
Database references

7 Andromedae (abbreviated 7 And) is a single,[9] yellow-white hued star in the northern constellation of Andromeda. 7 Andromedae is the Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 4.52,[2] and is located 79.6 light years from Earth, based on an annual parallax shift of 41 mas.[1] The star is moving further from the Sun with a heliocentric radial velocity of 12 km/s.[5]

This is an ordinary F-type main-sequence star with a stellar classification of F1V,[3] which indicates it is generating energy from hydrogen fusion at its core; this energy is being radiated from its photosphere at the rate of 7.8 times the Sun's luminosity with an effective temperature of 7,380 K. 7 Andromedae is 1.1 billion years old and is spinning with a projected rotational velocity of 61 km/s.


  1. ^ 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.
  2. ^ a b Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. ^ a b Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Robinson, P. E. (2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I". The Astronomical Journal. 126 (4): 2048. arXiv:astro-ph/0308182. Bibcode:2003AJ....126.2048G. doi:10.1086/378365.
  4. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data: 0. Bibcode:1986EgUBV........0M.
  5. ^ a b Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  6. ^ 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.
  7. ^ Maestro, V.; Che, X.; Huber, D.; Ireland, M. J.; Monnier, J. D.; White, T. R.; Kok, Y.; Robertson, J. G.; Schaefer, G. H.; Brummelaar, T. A. T.; Tuthill, P. G. (2013). "Optical interferometry of early-type stars with PAVO@CHARA - I. Fundamental stellar properties". Monthly Notices of the Royal Astronomical Society. 434 (2): 1321. arXiv:1306.5937. Bibcode:2013MNRAS.434.1321M. doi:10.1093/mnras/stt1092.
  8. ^ "7 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 12, 2018.
  9. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.