11 Lacertae

11 Lacertae

Observation data Epoch J2000      Equinox J2000
Constellation	Lacerta[1]
Right ascension	22^h 40^m 30.8591^s[2]
Declination	+44° 16′ 34.698″[2]
Apparent magnitude (V)	4.510[3]
Characteristics
Spectral type	K2III[3]
U−B color index	+1.36[4]
B−V color index	+1.33[4]
Astrometry
Proper motion (μ)	RA: +94.18[2] mas/yr Dec.: +10.00[2] mas/yr
Parallax (π)	10.81 ± 0.56[2] mas
Distance	300 ± 20 ly (93 ± 5 pc)
Details
Radius	30[5] R☉
Luminosity	287[5] L☉
Surface gravity (log g)	2.32[6] cgs
Temperature	4,440[6] K
Metallicity [Fe/H]	−0.25[6] dex
Rotational velocity (v sin i)	8[7] km/s
Other designations
車府二, HR 8632, BD+43 4266, HD 214868, SAO 52251, HIP 111944.[3]

11 Lacertae (11 Lac) is a star in the constellation Lacerta. 11 Lacertae is a giant star with a stellar classification of K2III, an apparent magnitude of 4.50 and absolute magnitude −0.33.^[8] It lies at a distance of about 300 light years.

References

1. Roman, N. G. (1987). "Identification of a Constellation from a Position". Archived from the original on 24 November 2006. Retrieved 2006-12-26.
2. Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics 323: L49–L52. Bibcode:1997A&A...323L..49P.
3. "11 Lac -- Star". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 2010-06-23.
4. Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory 4 (99). Bibcode:1966CoLPL...4...99J.
5. Baines, Ellyn K.; et al. (February 2010). "Angular Diameters and Effective Temperatures of 25 K Giant Stars from the CHARA Array". The Astrophysical Journal 710 (2): 1365–1374. arXiv:0912.5491. Bibcode:2010ApJ...710.1365B. doi:10.1088/0004-637X/710/2/1365. See table 4.
6. McWilliam, Andrew (December 1990). "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances". Astrophysical Journal Supplement Series 74: 1075–1128. Bibcode:1990ApJS...74.1075M. doi:10.1086/191527.
7. Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago 239 (1). Bibcode:1970CoAsi.239....1B.
8. Annals of the Astronomical Observatory of Harvard College 9. Harvard College Observatory. Retrieved 16 May 2010.

Coordinates: 22^h 40^m 30.78^s, +44° 16′ 34.6″