HD 240210

HD 240210
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Cassiopeia
Right ascension	23h 10m 29.2303s
Declination	+57° 01′ 46.035″
Apparent magnitude (V)	8.33
Characteristics
Spectral type	K3III
B−V color index	1.63
Variable type	none
Astrometry
Proper motion (μ)	RA: 21.20 mas/yr ; Dec.: 6.00 mas/yr
Parallax (π)	6.99 ± 3.01 mas
Distance	466 ± 173 ly ; (143 ± 53 pc)
Absolute magnitude (MV)	2.55
Details
Mass	1.25 ± 0.25 M☉
Radius	13 R☉
Luminosity	51.6 L☉
Temperature	4290 ± 13 K
Metallicity	–0.18 ± 0.12
Other designations
	BD+56° 2959, PPM 41549, SAO 35195, 10 Cassiopeiae
Database references
SIMBAD	data
Exoplanet Archive	data

HD 240210 is a type K3 giant star in the constellation of Cassiopeia. On June 10, 2009 a planet orbiting the star was discovered by Niedzielski et al. This exoplanet is a 6.9 Jupiter mass planet. It is also known as 10 Cassiopiae in Flamsteed numbers.^[1]

Charicteristics

Its estimated absolute magnitude is 2.55.Its B-V color index tells us it is "1.63", while our eyes tell us it is orange.

The system consists of HD 240210, HD 240210b, and an unconfirmed HD240210c.

The HD 240210 planetary system^[2]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	≥6.90 $M$ _J	1.33	501.75 ± 2.33	0.15 ± 0.02	—	—
c (unconfirmed)	3.80 M_J	2.1	994 ± 97	0.58 ± 0.35	—	—

^ Levy, Daniel H. (2002). A Guide to Skywatching. San Francisco, CA 94133 USA: Fog City Press. pp. 89, 151. ISBN 1 877019 06-2.{{cite book}}: CS1 maint: location (link)
^ Niedzielski, A.; et al. (2009). "Substellar-mass Companions to the K-dwarf BD+14 4559 and the K-giants HD 240210 and BD+20 2457". The Astrophysical Journal. 707 (1): 768–777. arXiv:0906.1804. Bibcode:2009ApJ...707..768N. doi:10.1088/0004-637X/707/1/768.

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