HD 44385
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 06h 33m 04.00s[1] |
| Declination | +78° 58′ 46.30″[1] |
| Apparent magnitude (V) | 6.60 ± 0.01[2] |
| Characteristics | |
| Evolutionary stage | red giant |
| Spectral type | K2II-III[1] or K0 |
| Astrometry | |
| Radial velocity (Rv) | 15.28 ± 0.14[1] km/s |
| Proper motion (μ) | RA: -4.328 ± 0.033[1] mas/yr Dec.: -17.300 ± 0.038[1] mas/yr |
| Parallax (π) | 4.5278 ± 0.0254[1] mas |
| Distance | 720 ± 4 ly (221 ± 1 pc) |
| Details[3] | |
| Mass | 1.8 ± 0.2 M☉ |
| Radius | 18.2 ± 1.2 R☉ |
| Luminosity | 233.2 L☉ |
| Surface gravity (log g) | 1.80 cgs |
| Temperature | 4499 K |
| Metallicity [Fe/H] | 0.10 ± 0.07 dex |
| Rotational velocity (v sin i) | 2.6 ± 0.5 km/s |
| Age | 1.8 ± 0.4 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 44385 is a star in the circumpolar constellation Camelopardalis. With an apparent magnitude of 6.60, it's below maximum naked eye visibility.
Properties[edit]
Distance[edit]
This star has a radial velocity of 15.28, which means it's drifting away from the Solar System. HD 44385 is currently 720 light years from earth based on parallax.
Properties[edit]
According to the paper, this star has a classification of K0. It has 1.8 times the mass of the Sun, but has expanded to 18.2 times the latter's girth. It radiates at 233.2 times the luminosity of the Sun, and has a similar metallicity to it. HD 44385 has an effective temperature of 4499 K, which gives it an orange hue of a K-type star.
Planetary System[edit]
In 2018, SENS discovered an extrasolar planet orbiting the giant star. Not much is known about this planet, and was discovered via Doppler spectroscopy.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (uncofirmed) | 5.9 ± 1.1 MJ | 1.4 ± 0.1 | 473.5 ± 4.9 | 0.20 ± 0.20 | — | — |
Notes[edit]
- 1.^ Self-calculated based on temperature and luminosity.
References[edit]
- ↑ 1.0 1.1 1.2 1.3 1.4 Gaia Collaboration (2018-04-01). "VizieR Online Data Catalog: Gaia DR2 (Gaia Collaboration, 2018)". VizieR Online Data Catalog. 1345. Bibcode:2018yCat.1345....0G.
- ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000-03-01). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
- ↑ Jeong, Gwanghui; Han, Inwoo; Park, Myeong-Gu; Hatzes, Artie P.; Bang, Tae-Yang; Gu, Shenghong; Bai, Jinming; Lee, Byeong-Cheol (2018-08-01). "A Search for Exoplanets around Northern Circumpolar Stars. IV. Six Planet Candidates to the K Giants, HD 44385, HD 97619, HD 106574, HD 118904, HD 164428, and HD 202432". The Astronomical Journal. 156 (2): 64. arXiv:1808.01109. Bibcode:2018AJ....156...64J. doi:10.3847/1538-3881/aacbc1. ISSN 0004-6256. Unknown parameter
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