Back Upsilon Andromedae Afrikaans تطوان (نجم) Arabic Upsilon Andromedae AST Ípsilon d'Andròmeda Catalan Titawin German Ύψιλον Ανδρομέδας Greek Ípsilon Andromedae Spanish پسی زن برزنجیر Persian Ypsilon Andromedae Finnish Upsilon Andromedae French

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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