41 Lyncis

41 Lyncis / Intercrus
	; Location of 41 Lyncis (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Ursa Major
Pronunciation	/ˈɪntərkrʌs/,
Right ascension	09h 28m 39.9889s
Declination	+45° 36′ 05.3353″
Apparent magnitude (V)	5.413
Characteristics
Spectral type	K0 III
U−B color index	0.74
B−V color index	0.983
Astrometry
Radial velocity (Rv)	+38.44 km/s
Proper motion (μ)	RA: −7.297±0.140 mas/yr ; Dec.: −129.582±0.130 mas/yr
Parallax (π)	11.6388 ± 0.1063 mas
Distance	280 ± 3 ly ; (85.9 ± 0.8 pc)
Absolute magnitude (MV)	0.675
Details
Mass	2.07+0.14; −0.16 M☉
Radius	11 R☉
Luminosity	55 L☉
Surface gravity (log g)	2.30 cgs
Temperature	4,789 K
Metallicity [Fe/H]	–0.23 dex
Rotational velocity (v sin i)	km/s
Age	4.07±2.24 Gyr
Other designations
	Intercrus, BD+46°1509, CCDM J09287+4536, GC 13051, HD 81688, HIP 46471, HR 3743, SAO 42876
Database references
SIMBAD	The star
	planet b

41 Lyncis (abbreviated 41 Lyn), also designated HD 81688 and named Intercrus /ˈɪntərkrʌs/, is a fifth-magnitude star located in the northern constellation of Ursa Major. An extrasolar planet (designated 41 Lyncis b or HD 81688 b, later named Arkas) is thought to be orbiting the star.

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Observation data Epoch J2000 Equinox J2000
Location of 41 Lyncis (circled)
Constellation	Ursa Major
Pronunciation	/ˈɪntərkrʌs/,^[1]
Right ascension	09^h 28^m 39.9889^s^[2]
Declination	+45° 36′ 05.3353″^[2]
Apparent magnitude (V)	5.413^[3]
Characteristics
Spectral type	K0 III^[4]
U−B color index	0.74
B−V color index	0.983^[5]
Astrometry

Radial velocity (R_v)	+38.44^[5] km/s
Proper motion (μ)	RA: −7.297±0.140^[2] mas/yr Dec.: −129.582±0.130^[2] mas/yr
Parallax (π)	11.6388 ± 0.1063 mas^[2]
Distance	280 ± 3 ly (85.9 ± 0.8 pc)
Absolute magnitude (M_V)	0.675^[5]

Details

Mass	2.07+0.14 −0.16^[6] `M`_☉
Radius	11^[7] `R`_☉
Luminosity	55^[7] `L`_☉
Surface gravity (log g)	2.30^[5] cgs
Temperature	4,789^[5] K
Metallicity [Fe/H]	–0.23^[5] dex
Rotational velocity (v sin i)	^[7] km/s
Age	4.07±2.24^[5] Gyr

Other designations
Intercrus, BD+46°1509, CCDM J09287+4536, GC 13051, HD 81688, HIP 46471, HR 3743, SAO 42876^[3]
Database references
SIMBAD	The star
	planet b