Astronomy:HD 32518

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Short description: Star in the constellation of Camelopardalis
HD 32518 / Mago
Observation data
Equinox J2000.0]] (ICRS)
Constellation Camelopardalis
Right ascension  05h 09m 36.720s[1]
Declination +69° 38′ 21.85″[1]
Apparent magnitude (V) 6.42±0.01[2]
Characteristics
Evolutionary stage Horizontal branch[3]
Spectral type K1 III[4]
U−B color index +1.03[5]
B−V color index +1.11[5]
Astrometry
Radial velocity (Rv)–7.02±0.35[6] km/s
Proper motion (μ) RA: +61.031[1] mas/yr
Dec.: −62.382[1] mas/yr
Parallax (π)8.2192 ± 0.0166[1] mas
Distance396.8 ± 0.8 ly
(121.7 ± 0.2 pc)
Absolute magnitude (MV)+1.04[7]
Details
Mass1.2±0.1[8] M☉
Radius10.8±0.3[8] R☉
Luminosity46.4±0.9[8] L☉
Surface gravity (log g)2.48[3] cgs
Temperature4,731[3] K
Metallicity [Fe/H]+0.04[3] dex
Rotational velocity (v sin i)1.2±2[9] km/s
Age6.4±1.5[8] Gyr
Other designations
Mago, BD+69°302, GC 6245, HD 32518, HIP 24003, HR 1636, SAO 13382[10]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

HD 32518 is a star with an orbiting exoplanet in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 6.42,[2] placing it near the limit of naked eye visibility. Located 397 light years away based on parallax measurements,[1] it is receding with a heliocentric radial velocity of −7.02 km/s.[6]

HD 32518 has a stellar classification of K1 III,[4] indicating that it is an orange giant star that has evolved away from the main sequence. Located in the cool end in the red clump, the object is currently on the horizontal branch.[3] This indicates it is generating energy by helium fusion at the core. It has 1.2 the mass of the Sun[8] but has expanded to a radius of 10.8 R☉.[8] It shines at 46.4 times the luminosity of the Sun[8] from its enlarged photosphere at an effective temperature of 4,731 K,[3] giving it an yellowish orange glow. HD 32518 is older than the Sun with an age of 6.4 billion years[8] and spins slowly with a projected rotational velocity of 1.2 km/s−1.[9] However, this amount is poorly constrained. As for its metallicity, studies place it around solar level.[3]

Planetary System

In August 2009, a group of astrometers discovered a super-jovian exoplanet orbiting the giant star using doppler spectroscopy.[11]

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 Mago National Park in Ethiopia, which is noted for its giraffes. The name was suggested by pupils of a physics course at the Max-Born-Gymnasium in Neckargemünd.[12][13][14]

The HD 32518 planetary system[11]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b (Neri) ≥3.04 ± 0.69 MJ 0.59 ± 0.03 157.54 ± 0.38 0.01 ± 0.03 — —

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Oja, T. (August 1991). "UBV photometry of stars whose positions are accurately known. VI.". Astronomy and Astrophysics Supplement Series 89: 415. ISSN 0365-0138. Bibcode: 1991A&AS...89..415O. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Ting, Yuan-Sen; Hawkins, Keith; Rix, Hans-Walter (3 May 2018). "A Large and Pristine Sample of Standard Candles across the Milky Way: ~100,000 Red Clump Stars with 3% Contamination". The Astrophysical Journal 858 (1): L7. doi:10.3847/2041-8213/aabf8e. ISSN 0004-637X. Bibcode: 2018ApJ...858L...7T. 
  4. ↑ 4.0 4.1 Halliday, Ian (September 1955). "Luminosity Function and Space Motions of G8-K1 Stars Derived from Spectroscopic Parallaxes.". The Astrophysical Journal 122: 222. doi:10.1086/146080. ISSN 0004-637X. Bibcode: 1955ApJ...122..222H. 
  5. ↑ 5.0 5.1 Oja, T. (April 1983). "UVB photometry of FK4 and FK4 Supplement stars.". Astronomy and Astrophysics Supplement Series 52: 131–134. ISSN 0365-0138. Bibcode: 1983A&AS...52..131O. 
  6. ↑ 6.0 6.1 Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (January 2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data: Revisiting the concept of superclusters". Astronomy & Astrophysics 430 (1): 165–186. doi:10.1051/0004-6361:20041272. ISSN 0004-6361. Bibcode: 2005A&A...430..165F. 
  7. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 8.6 8.7 Bonfanti, A. et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics 575: A18. doi:10.1051/0004-6361/201424951. Bibcode: 2015A&A...575A..18B. http://www.aanda.org/articles/aa/full_html/2015/03/aa24951-14/aa24951-14.html. 
  9. ↑ 9.0 9.1 de Medeiros, J. R.; Mayor, M. (November 1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series 139 (3): 433–460. doi:10.1051/aas:1999401. ISSN 0365-0138. Bibcode: 1999A&AS..139..433D. 
  10. ↑ "HD 32518". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+32518. 
  11. ↑ 11.0 11.1 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. doi:10.1051/0004-6361/200911702. Bibcode: 2009A&A...505.1311D. http://www.aanda.org/articles/aa/full_html/2009/39/aa11702-09/aa11702-09.html. 
  12. ↑ "International Astronomical Union | IAU". https://www.iau.org/news/pressreleases/detail/iau1912/. 
  13. ↑ "Approved names" (in en). http://www.nameexoworlds.iau.org/final-results. 
  14. ↑ "Abstimmung über Exoplaneten-Namen: Planet Neri umkreist Stern Mago". http://www.haus-der-astronomie.de/aktuelles/nameexoworlds2019. 

Coordinates: Sky map 05h 09m 36.7193s, +69° 38′ 21.844″



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