72 Herculis

72 Herculis
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension 17h 20m 39.56754s[1]
Declination +32° 28′ 03.8773″[1]
Apparent magnitude (V) 5.377±0.005[2]
Characteristics
Evolutionary stage Main sequence
Spectral type G0 V[3]
U−B color index +0.06[4]
B−V color index +0.62[4]
Variable type Suspected
Astrometry
Radial velocity (Rv)−78.608±0.0065[5] km/s
Proper motion (μ) RA: +135.731[1] mas/yr
Dec.: −1040.913[1] mas/yr
Parallax (π)68.7539 ± 0.0904 mas
Distance47.44 ± 0.06 ly
(14.54 ± 0.02 pc)
Absolute magnitude (MV)4.43±0.05[2]
Details
Mass0.91 M☉[2] or
1.18[6] M☉
Radius1.13+0.004
−0.007[1] R☉
Luminosity1.331±0.003[1] L☉
Surface gravity (log g)4.26±0.10[2] cgs
Temperature5,745±35[7] K
Metallicity [Fe/H]−0.31±0.11[7] dex
Rotational velocity (v sin i)1.0±1.0[2] km/s
Age4.1–6.6[8] Gyr
Other designations
w Her, 72 Her, NSV 8553, BD+32°2896, FK5 1456, GJ 672, HD 157214, HIP 84862, HR 6458, SAO 65963, LHS 441, LTT 15148[9]
Database references
SIMBADdata

72 Herculis is a single[10] star in the northern constellation of Hercules. The Flamsteed designation for this star comes from the publication Historia Coelestis Britannica by John Flamsteed. It is the 72nd star in Flamsteed's list of stars in Hercules. This star is faintly visible to the naked eye with an apparent visual magnitude of 5.4.[2] Parallax measurements show this star to be located at a distance of about 47 light years from the Sun.[1] It is drifting closer with a radial velocity of −78.6 km/s,[5] and is predicted to come to within 32.1 light-years in around 98,000 years.[6]

This is an ordinary G-type main-sequence star with a stellar classification of G0 V. It is similar in mass to the Sun,[2] with a 13% larger radius.[1] The star is radiating 1.3[1] times the luminosity of the Sun from its photosphere at an effective temperature of 5,745 K.[7] The metallicity is much lower than in the Sun, with an [Fe/H] equal to −0.31±0.11.[7] The star is an estimated 4–7[8] billion years old with a projected rotational velocity of 1 km/s.[2] The level of chromospheric activity appears to be at or below that in the Sun.[11]

As of 2010, no planetary companion had been detected orbiting this star.[12] The Washington Visual Double Star Catalog for 1996 showed two visual companions of this star. The first is a visual magnitude 9.7 star located 289.1 arc seconds away. The second is only separated by 8.7 arc seconds, and is magnitude 12.9.[13] It is unknown whether these visual companions are gravitationally-bound to 72 Her.

  1. ^ a b c d e f g h i Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h Cite error: The named reference mnras384_1_173 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference mnras396_4_1895 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference MERMILLIOD was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Soubiran2018 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Bailer2018 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Stonkutė2020 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference apj687 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Fuhrmann2017 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Hall2009 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Lubin2010 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Worley1997 was invoked but never defined (see the help page).