11 Lacertae

11 Lacertae

Observation data Epoch J2000      Equinox J2000
Constellation	Lacerta[1]
Right ascension	22^h 40^m 30.85881^s[2]
Declination	+44° 16′ 34.7042″[2]
Apparent magnitude (V)	4.46[3]
Characteristics
Spectral type	K2.5 III[4]
U−B color index	+1.36[3]
B−V color index	+1.33[3]
Astrometry
Proper motion (μ)	RA: +93.83[2] mas/yr Dec.: +10.71[2] mas/yr
Parallax (π)	9.80 ± 0.26[2] mas
Distance	333 ± 9 ly (102 ± 3 pc)
Absolute magnitude (MV)	+0.3[5]
Details
Radius	30[6] R☉
Luminosity	287[6] L☉
Surface gravity (log g)	2.32[7] cgs
Temperature	4,440[7] K
Metallicity [Fe/H]	−0.25[7] dex
Rotational velocity (v sin i)	8[8] km/s
Other designations
11 Lac, HR 8632, BD+43°4266, HD 214868, SAO 52251, HIP 111944
Database references
SIMBAD	data

11 Lacertae (11 Lac) is a star in the constellation Lacerta. 11 Lacertae is a giant star with a stellar classification of K2.5 III, an apparent magnitude of 4.5 and absolute magnitude +0.3. It lies at a distance of about 333 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. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
3. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
4. Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series (ISSN 0067-0049). 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
5. Wilson, O. C. (1976). "Absolute magnitudes of stars from widths of chromospheric Ca II emission lines". Astrophysical Journal. 205: 823. Bibcode:1976ApJ...205..823W. doi:10.1086/154338.
6. 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.
7. 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.
8. 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.

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