HD 46588

HD 46588 (HR 2401; Gliese 240.1) is a star in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.44,^[2] allowing it to be faintly seen with the naked eye. The object is relatively close at a distance of only 59 light years^[1] but is receding with a heliocentric radial velocity of 15 km/s.^[5]

HD 46588

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Camelopardalis
Right ascension	06h 46m 14.1500s[1]
Declination	+79° 33′ 53.3185″[1]
Apparent magnitude (V)	+5.44[2]
Characteristics
Spectral type	F7 V[3]
U−B color index	−0.02[4]
B−V color index	+0.53[4]
Astrometry
Radial velocity (Rv)	15.2±0.2[5] km/s
Proper motion (μ)	RA: −99.163 mas/yr[1] Dec.: −604.042 mas/yr[1]
Parallax (π)	54.9380 ± 0.0595 mas[1]
Distance	59.37 ± 0.06 ly (18.20 ± 0.02 pc)
Absolute magnitude (MV)	+4.18[2]
Details
Mass	1.13+0.03 −0.02[6] M☉
Radius	1.19[7] R☉
Luminosity	1.82[7] L☉
Surface gravity (log g)	4.40±0.02[6] cgs
Temperature	6,273±91[6] K
Metallicity [Fe/H]	−0.12±0.06[6] dex
Rotational velocity (v sin i)	6.63[8] km/s
Age	1.27+1.65 −0.22[6] Gyr
Other designations
23 H. Camelopardalis, AG+79°200, BD+79°212, GC 8711, GJ 240.1, HD 46588, HIP 32439, HR 2401, SAO 5946, WDS J06462+7934A
Database references
SIMBAD	data

HD 46588 is an ordinary F-type main-sequence star with a spectral classification of F7 V.^[3] It has 113% the mass of the Sun^[6] and 119% its radius.^[7] It shines at 182% the luminosity of the Sun^[7] from its photosphere at an effective temperature of 6,273 K,^[6] giving it a yellow white glow. Isochronic measurements place HD 46588's age at 1.27 billion years,^[6] but it's poorly constrained. The star's metallicity is 76% that of the Sun^[6] and spins modestly with a projected rotational velocity of 6.63 km/s.^[8]

Due to the star's close proximity to Earth and similarity to the Sun, it has been well studied by astronomers.^[9] No planets have been found, but a brown dwarf companion was discovered in a WISE survey in 2011. It has a mass of 67.04+8.38
−19.90 Jupiter masses and a temperature of 1360⁺⁵⁰
₋₈₀ K.^[9] An infrared excess has been discovered around HD 46588, indicating a cold debris disk with a temperature of 60 K.

The HD 46588 planetary system^[10]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (years)	Eccentricity	Inclination	Radius
dust disk	26.34 AU				—	—

References

1. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
2. 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.
3. Abt, Helmut A. (23 December 2008). "Mk Classifications of Spectroscopic Binaries". The Astrophysical Journal Supplement Series. 180 (1): 117–118. Bibcode:2009ApJS..180..117A. doi:10.1088/0067-0049/180/1/117. eISSN 1538-4365. ISSN 0067-0049.
4. Cowley, A. P.; Hiltner, W. A.; Witt, A. N. (December 1967). "Spectral classification and photometry of high proper motion stars". The Astronomical Journal. 72: 1334. Bibcode:1967AJ.....72.1334C. doi:10.1086/110413. ISSN 0004-6256.
5. Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
6. Aguilera-Gómez, Claudia; Ramírez, Iván; Chanamé, Julio (June 2018). "Lithium abundance patterns of late-F stars: an in-depth analysis of the lithium desert". Astronomy & Astrophysics. 614: A55. arXiv:1803.05922. Bibcode:2018A&A...614A..55A. doi:10.1051/0004-6361/201732209. eISSN 1432-0746. ISSN 0004-6361.
7. Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
8. Martínez-Arnáiz, R.; Maldonado, J.; Montes, D.; Eiroa, C.; Montesinos, B. (September 2010). "Chromospheric activity and rotation of FGK stars in the solar vicinity". Astronomy and Astrophysics. 520: A79. arXiv:1002.4391. Bibcode:2010A&A...520A..79M. doi:10.1051/0004-6361/200913725. eISSN 1432-0746. ISSN 0004-6361.
9. Loutrel, N. P.; Luhman, K. L.; Lowrance, P. J.; Bochanski, J. J. (12 September 2011). "DISCOVERY OF A COMPANION AT THE L/T TRANSITION WITH THE<i>WIDE-FIELD INFRARED SURVEY EXPLORER</i>". The Astrophysical Journal. 739 (2): 81. arXiv:1107.1812. Bibcode:2011ApJ...739...81L. doi:10.1088/0004-637X/739/2/81. eISSN 1538-4357. ISSN 0004-637X.
10. Gáspár, András; Rieke, George H.; Ballering, Nicholas (29 July 2016). "The Correlation Between Metallicity and Debris Disk Mass". The Astrophysical Journal. 826 (2): 171. arXiv:1604.07403. Bibcode:2016ApJ...826..171G. doi:10.3847/0004-637X/826/2/171. eISSN 1538-4357.