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Xi Geminorum

Xi Geminorum
Diagram showing star positions and boundaries of the Gemini constellation and its surroundings
Location of ξ Geminorum (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Gemini
Right ascension 06h 45m 17.36432s[1]
Declination +12° 53′ 44.1311″[1]
Apparent magnitude (V) 3.35[2]
Characteristics
Spectral type F5 IV-V[3]
U−B color index +0.06[4]
B−V color index +0.43[4]
Astrometry
Radial velocity (Rv)+25.6[2] km/s
Proper motion (μ) RA: –115.73[1] mas/yr
Dec.: –190.55[1] mas/yr
Parallax (π)55.56 ± 0.19 mas[1]
Distance58.7 ± 0.2 ly
(18.00 ± 0.06 pc)
Absolute magnitude (MV)2.14[5]
Details
Mass1.706 ± 0.012[6] M☉
Radius2.710 ± 0.021[6] R☉
Luminosity11.574 ± 0.238[6] L☉
Surface gravity (log g)3.81 ± 0.02[7] cgs
Temperature6,480 ± 39[6] K
Metallicity [Fe/H]0.00 ± 0.01[7] dex
Rotational velocity (v sin i)66.1 ± 3.3[8] km/s
Age1.5[9] Gyr
Other designations
31 Geminorum, HR 2484, HD 48737, BD+13°1396, FK5 256, HIP 32362, SAO 96074
Database references
SIMBADdata

Xi Geminorum (ξ Geminorum, abbreviated Xi Gem, ξ Gem), formally named Alzirr /ˈælzər/,[10] is a star in the zodiac constellation of Gemini. It forms one of the four feet of the outline demarcating the Gemini twins.[11] The star has an apparent visual magnitude of 3.35,[2] which is bright enough for it to be seen with the naked eye. From stellar parallax measurements, its distance from the Sun can be estimated as 58.7 light-years (18.0 parsecs).[1]

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  2. ^ a b c Cite error: The named reference scfs was invoked but never defined (see the help page).
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  4. ^ a b Cite error: The named reference clpl4 was invoked but never defined (see the help page).
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  6. ^ a b c d Cite error: The named reference apj746_1_101 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference aaa400_241 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference aaa446_1_267 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference aaa501_3_941 was invoked but never defined (see the help page).
  10. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.
  11. ^ Cite error: The named reference omeara was invoked but never defined (see the help page).
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