HD 100777
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.
| 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[1] mas |
| Distance | 161.8 ± 0.5 ly (49.6 ± 0.1 pc) |
| Absolute magnitude (MV) | 4.20 |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
| 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 | — | — |
References
- 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.
- "HD 100777". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-08.
- 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.
- "Approved names". NameExoworlds. Retrieved 2020-01-02.
- 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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