Upsilon Andromedae

This article is about υ Andromedae. For the variable star, see U Andromedae.
υ Andromedae / Titawin
Location of υ Andromedae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Andromeda
υ And A
Right ascension 01h 36m 47.84154s[1]
Declination +41° 24′ 19.6514″[1]
Apparent magnitude (V) 4.10[2]
υ And D[a]
Right ascension 01h 36m 50.40476s[3]
Declination +41° 23′ 32.1228″[3]
Characteristics
Spectral type F8V[4] + M4.5V[5]
Apparent magnitude (B) 4.63[6]
U−B color index 0.06
B−V color index 0.54
V−R color index 0.30[7]
R−I color index 0.30[7]
Astrometry
υ And A
Radial velocity (Rv)−28.59±0.08[8] km/s
Proper motion (μ) RA: −171.892±0.270[1] mas/yr
Dec.: −381.815±0.130[1] mas/yr
Parallax (π)74.1940 ± 0.2083 mas[1]
Distance44.0 ± 0.1 ly
(13.48 ± 0.04 pc)
Absolute magnitude (MV)3.44±0.02[9]
υ And D[a]
Proper motion (μ) RA: −172.437±0.031[3] mas/yr
Dec.: −383.824±0.027[3] mas/yr
Parallax (π)74.1815 ± 0.0356 mas[3]
Distance43.97 ± 0.02 ly
(13.480 ± 0.006 pc)
Details
υ And A
Mass1.27±0.06[9] M☉
Radius1.57±0.03[10] R☉
Luminosity3.1±0.1[10] L☉
Surface gravity (log g)4.0±0.1[9] cgs
Temperature6614±77[10] K
Metallicity [Fe/H]0.08[10] dex
Rotation7.3±0.04 d[11]
Rotational velocity (v sin i)9.5±0.8[9] km/s
Age3.12 ± 0.2[7] Gyr
υ And D[a]
Mass0.2[5] M☉
Other designations
Titawin,[12] 50 Andromedae, BD+40 332, CCDM 01367+4125, FK5 1045, GC 1948, GCTP 331.00, Gl 61, HD 9826, HIP 7513, HR 458, LTT 10561, SAO 37362, PPM 44216, WDS 01368+4124A, 2MASS J01364784+4124200, Gaia DR2 348020448377061376
Database references
SIMBADdata
υ And D
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

Upsilon Andromedae (υ Andromedae, abbreviated Upsilon And, υ And) is a binary star located 44 light-years from Earth in the constellation of Andromeda. The system consists of an F-type main-sequence star (designated υ Andromedae A, officially named Titawin in the Amazigh language /tɪtəˈwiːn/) and a smaller red dwarf.

As of 2015, three extrasolar planets (designated Upsilon Andromedae b, c, d; named Saffar, Samh and Majriti, respectively) are believed to orbit υ Andromedae A. All three are likely to be jovian planets that are comparable in size to Jupiter. This was both the first multiple-planet system to be discovered around a main-sequence star, and the first multiple-planet system known in a multiple-star system.

  1. ^ a b c d e Cite error: The named reference Gaia EDR3 for A was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Belle was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Gaia EDR3 for D was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference mk was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference lowrance was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ a b c McArthur, Barbara E.; et al. (2010). "New Observational Constraints on the υ Andromedae System with Data from the Hubble Space Telescope and Hobby Eberly Telescope" (PDF). The Astrophysical Journal. 715 (2): 1203. Bibcode:2010ApJ...715.1203M. doi:10.1088/0004-637X/715/2/1203. S2CID 120127162.
  8. ^ Cite error: The named reference rv was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference aaa336_942 was invoked but never defined (see the help page).
  10. ^ a b c d Cite error: The named reference baines2021 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference mnras408_3_1666 was invoked but never defined (see the help page).
  12. ^ "IAU Catalog of Star Names". Retrieved 28 July 2016.


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