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HD 85512 is a solitary K-type main-sequence star about 37 light-years away in the constellation Vela. It is about 1 billion years older than the Sun. It is extremely chromospherically inactive, only slightly more active than Tau Ceti. It exhibits a long-term variability[2] and is known to host one low-mass planet.

HD 85512
Observation data
Epoch J2000      Equinox J2000
Constellation Vela
Right ascension 09h 51m 07.0520s[1]
Declination −43° 30′ 10.0220″[1]
Apparent magnitude (V) 7.66
Characteristics
Spectral type K6V[2]
U−B color index 1.12
B−V color index 1.18
V−R color index 0.71
Astrometry
Radial velocity (Rv)−9.6 km/s
Proper motion (μ) RA: 461.446±0.103[1] mas/yr
Dec.: −472.010±0.116[1] mas/yr
Parallax (π)88.6158 ± 0.0406 mas[1]
Distance36.81 ± 0.02 ly
(11.285 ± 0.005 pc)
Absolute magnitude (MV)7.39[3]
Details[2][4]
Mass0.69 M☉
Radius0.533 ± 0.04[note 1] R☉
Luminosity (bolometric)0.126 ± 0.008 L☉
Surface gravity (log g)4.604±0.017 cgs
Temperature4404±10 K
Metallicity([Si/H] dex) -0.02
Metallicity [Fe/H]-0.28 dex
Rotation47.13 ± 6.98
Rotational velocity (v sin i)2.194±0.118 km/s
Age5.61 ± 0.61 Gyr
Other designations
CD−42°5678, Gaia DR2 5412947081287925504, GJ 370, HD 85512, HIP 48331, LHS 2201, 2MASS J09510700-4330097[5]
Database references
SIMBADdata

Planetary system


Main article: HD 85512 b
Artists's impression of HD 85512 b.[6] Credit: ESO/M. Kornmesser.
Artists's impression of HD 85512 b.[6] Credit: ESO/M. Kornmesser.

On August 19, 2011, a ≥3.6 Earth-mass planet was discovered using HARPS that is "just inside" the habitable zone, along with: inner planets of e (or 82 G.) Eridani; and HR 7722 c in Capricornus. These two comparator sets are at about 2⁄3 of the subject's distance from Earth.[7] The subject planet could be cool enough to host liquid water if it has more than 50% cloud coverage. For a time it ranked fifth-best for habitability in the Habitable Exoplanets Catalog, which later lists it under false starts as "too hot".[8]

The HD 85512 planetary system[7]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥3.6 M🜨 0.26 ± 0.005 58.43 ± 0.13 0.11 ± 0.1 — —

Position


The star lies in Vela, 3′32″ west of, and 10′54″ north of LZ Velorum (HD 86005), a chromospherically active giant, variable star, at 2090 light years away, of orange-to-red color. It has similar average magnitude.[9]


References


  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Anglada-Escudé, Guillem; Butler, R. Paul (2012), "The HARPS-TERRA project. I. Description of the algorithms, performance, and new measurements on a few remarkable stars observed by HARPS", The Astrophysical Journal Supplement Series, 200 (2): 15, arXiv:1202.2570, doi:10.1088/0067-0049/200/2/15, S2CID 118528839
  3. Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191, S2CID 118577511.
  4. Spectroscopic Parameters and atmosphEric ChemIstriEs of Stars (SPECIES) I. Code description and dwarf stars catalogue Full table D.1
  5. "HD 85512". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-22.
  6. "Fifty New Exoplanets Discovered by HARPS". ESO Science Release. 12 September 2011. Retrieved 13 September 2011.
  7. Pepe, F.; et al. (2011). "The HARPS search for Earth-like planets in the habitable zone. I. Very low-mass planets around HD 20794, HD 85512, and HD 192310". Astronomy and Astrophysics. 534. A58. arXiv:1108.3447. Bibcode:2011A&A...534A..58P. doi:10.1051/0004-6361/201117055.
  8. "False Starts: Potentially Habitable Exoplanets - Planetary Habitability Laboratory @ UPR Arecibo".
  9. "LZ Velorum - Universe Guide".

Notes


  1. From , where is the radius, is the luminosity, is the effective surface temperature and is the Stefan–Boltzmann constant.



На других языках

[de] HD 85512

HD 85512 (auch Gliese 370) ist ein einzelner, oranger Hauptreihenstern (K5 V), der etwa 37 Lichtjahre von der Erde entfernt ist und im Sternbild Vela liegt.
- [en] HD 85512

[es] Gliese 370

Gliese 370 (GJ 370 / HD 85512)[1] es una estrella de magnitud aparente +7,92 en la constelación de Vela. Situada a 36,4 años luz de distancia del Sistema Solar, las estrellas conocidas más cercanas a Gliese 370 son Gliese 358 y Gliese 367, respectivamente a 5,7 y 6,6 años luz.[2] En 2011 se descubrió un planeta extrasolar en órbita alrededor de esta estrella.

[ru] Глизе 370

Глизе 370 (HD 85512) — одиночная звезда в созвездии Парусов. Расположена в 36 световых годах от Земли.


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