Back Gamma Delphini AST Gamma Delphini BS Gama Delphini Czech Gamma Delphini German Gamma Delphini Spanish گاما دلفین Persian Gamma Delphini French Gamma Delphini ID いるか座ガンマ星 Japanese Гамма Дельфина Russian

Gamma Delphini

γ Delphini
Location of γ Delphini (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Delphinus
γ1
Right ascension 20h 46m 38.86045s[1]
Declination +16° 07′ 26.8516″[1]
Apparent magnitude (V) 5.14
γ2
Right ascension 20+46
−39.49919[2]
Declination +16° 07′ 27.4358″[2]
Apparent magnitude (V) 4.360[3]
Characteristics
γ1
Spectral type F7V[4]
U−B color index 0.08
B−V color index 0.49
γ2
Evolutionary stage Subgiant[5]
Spectral type K1IV[6]
U−B color index 0.97
B−V color index 1.04
Astrometry
γ1
Radial velocity (Rv)−7.25±0.44[7] km/s
Proper motion (μ) RA: −11.153[1] mas/yr
Dec.: −203.341[1] mas/yr
Parallax (π)28.4068 ± 0.1504 mas[1]
Distance114.8 ± 0.6 ly
(35.2 ± 0.2 pc)
Absolute magnitude (MV)2.24[4]
γ2
Radial velocity (Rv)−6.33±0.35[7] km/s
Proper motion (μ) RA: −29.851[2] mas/yr
Dec.: −196.058[2] mas/yr
Parallax (π)28.5183 ± 0.4772 mas[2]
Distance114 ± 2 ly
(35.1 ± 0.6 pc)
Absolute magnitude (MV)1.81[8]
Orbit[9]
Companionγ1
Period (P)3,249 yr
Semi-major axis (a)10.22″
Eccentricity (e)0.88
Inclination (i)148.78°
Longitude of the node (Ω)88.06°
Periastron epoch (T)2,305
Argument of periastron (ω)
(secondary)		331.16°
Details[7]
γ1
Mass1.61±0.04 M☉
Radius2.60±0.12 R☉
Luminosity10.2 L☉
Surface gravity (log g)3.79±0.05 cgs
Temperature6,295±25 K
Metallicity [Fe/H]0.06±0.02 dex
Rotational velocity (v sin i)7.8[4] km/s
Age1.85±0.17 Gyr
γ2
Mass1.99±0.06 M☉
Radius8.43±0.33 R☉
Luminosity33.1 L☉
Surface gravity (log g)3.04±0.06 cgs
Temperature4,798±20 K
Metallicity [Fe/H]0.12±0.03 dex
Rotational velocity (v sin i)3.6[10] km/s
Age1.81±0.11 Gyr
Other designations
γ Del, 12 Delphini, BD+15°4255, CCDM J20467+1607, WDS 20467+1607
γ1: HD 197963, HIP 102531, HR 7947, SAO 106475
γ2: HD 197964, HIP 102532, HR 7947/7948, SAO 106476
Database references
SIMBADγ Del
γ1 Del
γ2 Del

Gamma Delphini, which is Latinized from γ Delphini, is a wide binary star system in the northern constellation of Delphinus. The star marks one corner of the asterism "Job's Coffin". The pair can be split with a modest amateur telescope and have been described as "one of the prettier pairs in the sky", with their contrasting colors said to be orange and lime in appearance.[11] Together, the system is visible to the naked eye with a combined apparent visual magnitude of 3.87.[12]

  1. ^ a b c d e Cite error: The named reference GaiaDR2_1 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference GaiaDR2_2 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Mason_et_al_2014 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Luck2017 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Abr2019 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Cenarro_et_al_2007 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Villaver_et_al_2013 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Hale, A. was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Massarotti_et_al_2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Consolmagno_Davis_2011 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Kaler was invoked but never defined (see the help page).
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