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HD 46509

Location of HD 46509 on the map (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Camelopardalis
Right ascension	06 40 32.25255
Declination	+71° 44′ 55.6296″
Apparent magnitude (V)	5.86±0.01
Characteristics
Spectral type	G9 III or K0 III
B−V color index	+1.19
Astrometry
Radial velocity (Rv)	−24.02±0.19 km/s
Proper motion (μ)	RA: +4.653 mas/yr Dec.: +11.103 mas/yr
Parallax (π)	4.1248 ± 0.0376 mas
Distance	791 ± 7 ly (242 ± 2 pc)
Absolute magnitude (MV)	−0.98
Details
Mass	5.64±1.82 M☉
Radius	27.3±0.6 R☉
Luminosity	399±7 L☉
Surface gravity (log g)	2.34±0.11 cgs
Temperature	4,675±92 K
Metallicity	+0.12±0.05 dex
Rotational velocity (v sin i)	1.5±1.2 km/s
Age	339 −63 Myr
Other designations
AG+71°216, BD+71°359, FK5 2511, GC 8630, HD 46509, HIP 31946, HR 2396, SAO 5925
Database references
SIMBAD	data

HD 46509, also designated as HR 2396, is a solitary star located in the northern circumpolar constellation Camelopardalis, the giraffe. It is faintly visible to the naked eye as a yellowish-orange hued point of light with an apparent magnitude of 5.86. The object is located relatively far at a distance of 791 light-years based on Gaia DR3 parallax measurements, but it is drifting closer with a heliocentric radial velocity of −24.02 km/s. At its current distance, HD 46509's brightness is diminished by interstellar extinction of 0.31 magnitudes and it has an absolute magnitude of −0.98.

HD 46509 has a stellar classification of either G9 III or K0 III, with both classes indicating that it is an evolved red giant. It is estimated to be 339 million years old, enough time for it to cool and expand to 27.3 times the radius of the Sun. HD 46509 has about 5.6 times the mass of the Sun and it radiates 399 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,675 K. It is metal enriched with an iron abundance 132% that of the Sun's ( = +0.12) and like most giant stars, it spins slowly with a projected rotational velocity of approximately 1.5 km/s.

References

1. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
2. ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "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. S2CID 17128864.
3. ^ Wilson, Ralph E.; Joy, Alfred H. (March 1950). "Radial Velocities of 2111 Stars". The Astrophysical Journal. 111: 221. Bibcode:1950ApJ...111..221W. doi:10.1086/145261. eISSN 1538-4357. ISSN 0004-637X. S2CID 122883647.
4. ^ Halliday, Ian (September 1955). "Luminosity Function and Space Motions of G8-K1 Stars Derived from Spectroscopic Parallaxes". The Astrophysical Journal. 122: 222. Bibcode:1955ApJ...122..222H. doi:10.1086/146080. ISSN 0004-637X. S2CID 119640884.
5. Haggkvist, L.; Oja, T. (1970). "Results of BV photometry 1969-70 (Uppsala refractor)". Private Communication. Bibcode:1970Priv.........0H. S2CID 231475662.
6. ^ 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 and Astrophysics. 430: 165. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. S2CID 17804304.
7. ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
8. ^ Feuillet, Diane K.; Bovy, Jo; Holtzman, Jon; Girardi, Léo; MacDonald, Nick; Majewski, Steven R.; Nidever, David L. (20 January 2016). "Determining Ages of APOGEE Giants with Known Distances". The Astrophysical Journal. 817 (1): 40. arXiv:1511.04088. Bibcode:2016ApJ...817...40F. doi:10.3847/0004-637X/817/1/40. eISSN 1538-4357. S2CID 118675933.
9. ^ 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. Bibcode:1999A&AS..139..433D. doi:10.1051/aas:1999401. ISSN 0365-0138. S2CID 54046583.
10. "HD 46509". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved July 17, 2023.

v t e Constellation of Camelopardalis
Camelopardalis in Chinese astronomy List of stars in Camelopardalis
Stars	Bayer α β γ Flamsteed 1 2 3 4 5 7 8 11 12 14 15 16 17 18 19 20 21 22 23 24 26 28 29 30 31 33 34 35 36 37 38 39 40 41 42 43 49 51 53 Variable U Z RU ST TX VZ BD BE BK BN CE CO CQ CS DD MY HR 967 1046 1073 1112 1124 1129 1138 1158 1192 1204 1205 1241 1242 1305 1313 1314 1327 1335 1342 1401 1440 1491 1527 1561 1624 1636 (Mago) 1675 1683 1686 1720 1844 1916 2209 2363 2396 2401 2527 2581 2830 3075 3082 3216 4062 4084 4609 (Tonatiuh) 4892 4893 5009 5091 5203 HD 35759 Other 2MASS J05325346+8246465 Gliese 445 NGC 2363-V1 PSR B0329+54 Stein 2051 Struve 1694 XO-3 XO-6
Exoplanets HD 32518 b HD 33564 b HD 104985 b XO-3b XO-6b
Star clusters NGC 1502
Nebulae IC 3568 (Lemon Slice Nebula) M4-18 NGC 1501 NGC 2404
Galaxies	NGC 1530 1560 1569 1573 1573A 1961 2146 2336 2363 2366 2403 2441 2460 2523 2655 2715 2748 5640 Other DDO 44 IC 342 IRAS 07598+6508 MACS0647-JD UGC 3478 UGC 3730 UGCA 86
Galaxy clusters MACS J0647.7+7015 MS 0735.6+7421
Astronomical events SN 1996ah GRB 970508 SN 2004dj SN 2010lt
Category

• K-type giants
• Camelopardalis
• Durchmusterung objects
• Henry Draper Catalogue objects
• Hipparcos objects
• Bright Star Catalogue objects