HD 65216

HD 65216
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 07h 53m 41.3193s[1]
Declination −63° 38′ 50.353″[1]
Apparent magnitude (V) 7.97[2]
Characteristics
Spectral type G5V[3] + M7–8 + L2–3[4]
B−V color index 0.672±0.012[2]
Astrometry
Radial velocity (Rv)42.57±0.16[1] km/s
Proper motion (μ) RA: −123.633±0.065 mas/yr[1]
Dec.: 146.578±0.073 mas/yr[1]
Parallax (π)28.4445 ± 0.0317 mas[1]
Distance114.7 ± 0.1 ly
(35.16 ± 0.04 pc)
Absolute magnitude (MV)5.22[2]
Details
HD 65216 A
Mass0.95±0.01[5] M☉
Radius0.864±0.003[5] R☉
Luminosity0.716±0.001[5] L☉
Surface gravity (log g)4.53±0.01[5] cgs
Temperature5,718±8[5] K
Metallicity [Fe/H]−0.17[6] dex
Rotational velocity (v sin i)1.308[6] km/s
Age1.7±0.5[5] Gyr
Other designations
CD−63°359, HD 65216, HIP 38558, SAO 250002, WDS J07537-6339A[7]
Database references
SIMBADdata

HD 65216 is a triple[4] star system with two exoplanetary companions in the southern constellation of Carina. With an apparent visual magnitude of 7.97[2] it cannot be readily seen without technical aid, but with binoculars or telescope it should be visible. The system is located at a distance of 114.7 light-years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of 42.6 km/s.[1]

The primary, component A, is an ordinary G-type main-sequence star with a stellar classification of G5V.[3] It is nearly two billion years old[5] and is spinning with a projected rotational velocity of 1.3 km/s.[6] The star has 95% of the mass and 86% of the radius of the Sun. It is radiating 72% of the luminosity of the Sun from its photosphere at an effective temperature of 5,718 K.[5]

In 2008 a co-moving binary system of low mass companions were discovered at an angular separation of 7″ from the primary, which is equivalent to a projected separation of 253 AU at the distance of HD 65216. Component B is of class M7–8 (0.089 M☉) while component C is class L2–3 (0.078 M☉); both have a mass close to the sub-stellar limit. The pair have a projected separation of 6 AU from each other.[4]

  1. ^ a b c d e f Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1979 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Mugrauer_et_al_2007 was invoked but never defined (see the help page).
  5. ^ a b c d e f g h Cite error: The named reference Bonfanti2015 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Costa_Silva_et_al_2020 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).