Gamma Aquarii

Gamma Aquarii
Location of γ Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 21m 39.37542s[1]
Declination –01° 23′ 14.4031″[1]
Apparent magnitude (V) 3.849[2]
Characteristics
Spectral type A0 V[3]
U−B color index –0.092[2]
B−V color index –0.060[2]
Astrometry
Radial velocity (Rv)−15.7±0.9[4] km/s
Proper motion (μ) RA: +129.53[1] mas/yr
Dec.: +7.77[1] mas/yr
Parallax (π)19.92 ± 1.04 mas[1]
Distance164 ± 9 ly
(50 ± 3 pc)
Absolute magnitude (MV)+0.10[5]
Details
Aa
Mass2.72±0.04[6] M☉
Radius2.7[6] R☉
Surface gravity (log g)3.99±0.14[7] cgs
Temperature10,637±362[7] K
Metallicity [Fe/H]+0.30[8] dex
Rotational velocity (v sin i)80[9] km/s
Age280±20[6] Myr
Ab
Mass0.56[6] M☉
Radius0.5[6] R☉
Temperature3,900[6] K
Other designations
Sadalachbia, Sadachbia, Gamma Aqr, γ Aqr, 48 Aquarii, BD−02°5741, FK5 842, HD 212061, HIP 110395, HR 8518, SAO 146044, ADS 15864, WDS J22217-0123A[10]
Database references
SIMBADdata

Gamma Aquarii, or γ Aquarii, is a binary star system[6] in the constellation of Aquarius. It has an apparent visual magnitude of 3.849,[2] making it one of the brighter members of the constellation. Based upon parallax measurements taken during the Hipparcos mission, this star is located at a distance of approximately 164 light-years (50 parsecs) from the Sun.[1] It is drifting closer to the Sun with a radial velocity of −16 km/s.[4] In 1998, Olin J. Eggen included this star as a candidate member of the Hyades Supercluster.[5]

The two components are designated Gamma Aquarii Aa, formally called Sadachbia /səˈdækbiə/,[11] and Ab.

  1. ^ a b c d e f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference saaoc8_59 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference aj74_375 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Eggen1998 was invoked but never defined (see the help page).
  6. ^ a b c d e f g Cite error: The named reference waisberg was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference David2015 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference apj155_537 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference aaa463_2_671 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ "Naming Stars". IAU.org. Retrieved 26 February 2018.