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HD 100777

Coordinates: Sky map 11h 35m 51.5234s, −04° 45′ 20.509″
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HD 100777
Observation data
Epoch J2000      Equinox J2000
Constellation Leo
Right ascension 11h 35m 51.5230s[1]
Declination −04° 45′ 20.5012″[1]
Apparent magnitude (V) 8.42
Characteristics
Spectral type K0IV
Astrometry
Proper motion (μ) RA: −11.353±0.111[1] mas/yr
Dec.: 35.358±0.061[1] mas/yr
Parallax (π)20.1596 ± 0.0589 mas[1]
Distance161.8 ± 0.5 ly
(49.6 ± 0.1 pc)
Absolute magnitude (MV)4.20
Other designations
BD–03°3147, HIP 56572, SAO 138288, TYC 4933-678-1, 2MASS J11355152-0445204[2]
Database references
SIMBADdata

HD 100777 is an orange subgiant star located approximately 162 light years away in the constellation Leo. The apparent magnitude is 8.42 and absolute magnitude is 4.81. It is also called HIP 56572.

The survey in 2015 have ruled out the existence of any additional stellar companions at projected distances from 18 to 369 astronomical units.[3]

Planetary system

In 2007, a planet was found to be orbiting the star.

International Astronomical Union held the NameExoWorlds campaign in 2019. Nepal named the star Sagarmatha ("similar to Nepali name of the Mt. Everest" ) and the exoplanet revolving it was named as Laligurans (The nepali name of the flower Rhododendron).[4]

The HD 100777 planetary system[5]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b >1.16 ± 0.03 MJ 1.03 ± 0.03 383.7 ± 1.2 0.36 ± 0.02 — —

See also

References

  1. ^ a b c d e 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. ^ "HD 100777". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-08.
  3. ^ Mugrauer, M.; Ginski, C. (12 May 2015). "High-contrast imaging search for stellar and substellar companions of exoplanet host stars". Monthly Notices of the Royal Astronomical Society. 450 (3): 3127–3136. doi:10.1093/mnras/stv771. Retrieved 19 June 2020.
  4. ^ "Approved names". NameExoworlds. Retrieved 2020-01-02.
  5. ^ Naef, M.; et al. (2007). "The HARPS search for southern extra-solar planets. IX. Exoplanets orbiting HD 100777, HD 190647, and HD 221287". Astronomy and Astrophysics. 470 (2): 721–726. arXiv:0704.0917. Bibcode:2007A&A...470..721N. doi:10.1051/0004-6361:20077361.



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