HD 32518

HD 32518 is a 6th magnitude K-type giant star located 399.7 light years away in the constellation of Camelopardalis. It is 1.13 times more massive, 10.22 times larger, and 41.2 times more luminous than the Sun. However, it has a lower amount of metals than our Sun and the age is older. In August 2009, it was found that this giant star has a giant planet.[3]

HD 32518

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Camelopardalis
Right ascension	05^h 09^m 36.7201^s[1]
Declination	+69° 38′ 21.8551″[1]
Apparent magnitude (V)	6.436
Characteristics
Spectral type	K1III
Apparent magnitude (B)	7.537
Apparent magnitude (J)	4.531
Apparent magnitude (H)	3.992
Apparent magnitude (K)	3.911
B−V color index	1.101
Astrometry
Radial velocity (Rv)	–7.02 km/s
Proper motion (μ)	RA: 61.133±0.026[1] mas/yr Dec.: −62.406±0.033[1] mas/yr
Parallax (π)	8.1601 ± 0.0204[1] mas
Distance	399.7 ± 1.0 ly (122.5 ± 0.3 pc)
Absolute magnitude (MV)	1.09
Details
Mass	1.2 ± 0.1[2] M☉
Radius	10.8 ± 0.3[2] R☉
Luminosity	46.4 ± 0.9[2] L☉
Surface gravity (log g)	2.4 ± 0.1[2] cgs
Temperature	4599 ± 41[2] K
Metallicity [Fe/H]	−0.15 ± 0.04 dex
Age	6.4 ± 1.5[2] Gyr
Other designations
Mago, BD+69°302, GC 6245, GCRV 3027, HIP 24003, HR 1636, PPM 15168, SAO 13382
Database references
SIMBAD	data
Exoplanet Archive	data
Extrasolar Planets Encyclopaedia	data

For the 100th anniversary of the IAU HD 32518 and the planet HD 32518b were selected NameExoWorlds campaigns for Germany. The approved name of the star HD 32518 is Mago, named after the Mago National Park in Ethiopia noted for its giraffes. The name was suggested by pupils of a physics course at the Max-Born-Gymnasium in Neckargemünd.[4][5][6]

The HD 32518 planetary system[3]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	≥3.04 ± 0.69 MJ	0.59 ± 0.03	157.54 ± 0.38	0.01 ± 0.03	—	—

See also

• 11 Ursae Minoris
• List of extrasolar planets

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. Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951. S2CID 54555839.
3. Döllinger, M.; et al. (2009). "Planetary companions around the K giant stars 11 Ursae Minoris and HD 32518". Astronomy and Astrophysics. 505 (3): 1311–1317. arXiv:0908.1753. Bibcode:2009A&A...505.1311D. doi:10.1051/0004-6361/200911702. S2CID 9686080.
4. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
5. "Approved names". NameExoworlds. Retrieved 2020-01-02.
6. "Abstimmung über Exoplaneten-Namen: Planet Neri umkreist Stern Mago". www.haus-der-astronomie.de. Retrieved 2020-01-02.