Gliese 251

Coordinates: Sky map 06h 54m 48.96009s, +33° 16′ 05.4393″
Source: Wikipedia, the free encyclopedia.
Gliese 251
Observation data
J2000
Constellation Gemini
Right ascension 06h 54m 48.96009s[1]
Declination +33° 16′ 05.4393″[1]
Apparent magnitude (V) +10.11[2]
Characteristics
Spectral type M3.0Ve[3]
U−B color index +1.20[4]
B−V color index +1.60[4]
Distance
18.215 ± 0.003 ly
(5.5846 ± 0.0009 pc)
Absolute magnitude (MV)11.23[7]
Details
Rotational velocity (v sin i)
≤2[8] km/s
Ross 578, Wolf 294, 2MASS J06544902+3316058[9]
Database references
SIMBADdata
ARICNSdata
Gliese 251 is located in the constellation Gemini
Gliese 251 is located in the constellation Gemini
Gliese 251
Location of Gliese 251 in the constellation Gemini

Gliese 251, also known as HIP 33226 or HD 265866, is a

light years away.[11]

Gliese 251 is a

spectral type of M3V[3] with an effective temperature of about 3300 K.[3] Its mass has been measured to be around 0.36 solar masses[8] and its radius is about 36% solar radii.[8] Its metallicity is likely slightly less than that of the Sun.[8] Observations at infrared wavelengths rule out the presence of a circumstellar disk around it.[12]

Planetary system

In 2019, two candidate planets were detected by the

CARMENES data refuted both candidates, as they found that both signals were caused by stellar activity. Based on the CARMENES data, the team announced that Gliese 251 is orbited by one single super-Earth (Gliese 251 b) at an orbit of 14.238 days.[8]

The Gliese 251 planetary system[8]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b
 		≥4.0±0.4 M🜨 0.0818+0.0011
−0.0012 		14.238±0.002 0.10+0.09
−0.07 		— —

See also

References

  1. ^
    S2CID 18759600
    .
  2. ^
    Bibcode:2000A&A...355L..27H
    .
  3. ^
    S2CID 117144290
    .
  4. ^
    Bibcode:1986EgUBV........0M
    .
  5. S2CID 51814894
    .
  6. doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR
    .
  7. ^ "ARICNS 4C00526". ARICNS. Retrieved 8 February 2017.
  8. ^
    S2CID 222090233
  9. ^ "GJ 251". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 February 2017.
  10. ^ "Closest Stars". Retrieved 8 February 2017.
  11. ^ "Stars within 15 light-years of Wolf 294". The Internet Stellar Database. Retrieved 7 February 2017.
  12. S2CID 14207148
    .
  13. arXiv:1906.04644 [astro-ph.EP
    ].

Notes

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