Gliese 445

Gliese 445
	; Image of AC +79 3888 (circled), also known as Gliese 445, located 17.1 light-years from Earth; Credit: Caltech/Palomar
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Camelopardalis
Right ascension	11h 47m 41.3885s
Declination	+78° 41′ 28.179″
Apparent magnitude (V)	10.80
Characteristics
Spectral type	M4.0Ve
B−V color index	1.572
Astrometry
Radial velocity (Rv)	−111.707 km/s
Proper motion (μ)	RA: 748.111 mas/yr ; Dec.: 480.804 mas/yr
Parallax (π)	190.3251 ± 0.0194 mas
Distance	17.137 ± 0.002 ly ; (5.2542 ± 0.0005 pc)
Absolute magnitude (MV)	12.227
Details
Mass	0.14 M☉
Radius	0.285 R☉
Luminosity	0.008 L☉
Surface gravity (log g)	4.72 cgs
Temperature	3,507 K
Metallicity [Fe/H]	−0.30 dex
Rotational velocity (v sin i)	<2.5 km/s
Other designations
	Gliese 445, Gl 445, G 254-29, AC+79 3888, HIP 57544, LFT 849, LHS 2459, LTT 13235, NLTT 28539, PLX 2722
Database references
SIMBAD	data
ARICNS	data
	Gliese 445 Location of Gliese 445 in the constellation Camelopardalis;

Gliese 445 (Gl 445 or AC +79 3888) is an M-type main sequence star in the northern part of the constellation Camelopardalis.

^ ^a ^b ^c ^d ^e ^f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ ^a ^b Urban, S. E.; Zacharias, N.; Wycoff, Observatory G. L. U. S. Naval; Washington, 2004-2006 D. C. (2004). "VizieR Online Data Catalog: The UCAC2 Bright Star Supplement (Urban+, 2006)". VizieR On-line Data Catalog. Bibcode:2004yCat.1294....0U.{{cite journal}}: CS1 maint: numeric names: authors list (link)
^ Lépine, Sébastien; Hilton, Eric J.; Mann, Andrew W.; Wilde, Matthew; Rojas-Ayala, Bárbara; Cruz, Kelle L.; Gaidos, Eric (2013). "A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky". The Astronomical Journal. 145 (4): 102. arXiv:1206.5991. Bibcode:2013AJ....145..102L. doi:10.1088/0004-6256/145/4/102. S2CID 117144290.
^ 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.
^ ^a ^b ^c Houdebine, Éric R.; Mullan, D. J.; Doyle, J. G.; de la Vieuville, Geoffroy; Butler, C. J.; Paletou, F. (2019). "The Mass-Activity Relationships in M and K Dwarfs. I. Stellar Parameters of Our Sample of M and K Dwarfs". The Astronomical Journal. 158 (2): 56. arXiv:1905.07921. Bibcode:2019AJ....158...56H. doi:10.3847/1538-3881/ab23fe. S2CID 159041104.
^ Gaidos, E.; Mann, A. W.; Lépine, S.; Buccino, A.; James, D.; Ansdell, M.; Petrucci, R.; Mauas, P.; Hilton, E. J. (2014). "Trumpeting M dwarfs with CONCH-SHELL: A catalogue of nearby cool host-stars for habitable exoplanets and life". Monthly Notices of the Royal Astronomical Society. 443 (3): 2561. arXiv:1406.7353. Bibcode:2014MNRAS.443.2561G. doi:10.1093/mnras/stu1313. S2CID 119234492.
^ ^a ^b McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. S2CID 73594365.
^ Stelzer, B.; Marino, A.; Micela, G.; López-Santiago, J.; Liefke, C. (2013). "The UV and X-ray activity of the M dwarfs within 10 pc of the Sun". Monthly Notices of the Royal Astronomical Society. 431 (3): 2063. arXiv:1302.1061. Bibcode:2013MNRAS.431.2063S. doi:10.1093/mnras/stt225. S2CID 119193975.
^ "GJ 445". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved July 29, 2008.

[dr2-1] ^ ^a ^b ^c ^d ^e ^f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.

[ucac2-2] Urban, S. E.; Zacharias, N.; Wycoff, Observatory G. L. U. S. Naval; Washington, 2004-2006 D. C. (2004). "VizieR Online Data Catalog: The UCAC2 Bright Star Supplement (Urban+, 2006)". VizieR On-line Data Catalog. Bibcode:2004yCat.1294....0U.{{cite journal}}: CS1 maint: numeric names: authors list (link)

[lepine2013-3] Lépine, Sébastien; Hilton, Eric J.; Mann, Andrew W.; Wilde, Matthew; Rojas-Ayala, Bárbara; Cruz, Kelle L.; Gaidos, Eric (2013). "A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky". The Astronomical Journal. 145 (4): 102. arXiv:1206.5991. Bibcode:2013AJ....145..102L. doi:10.1088/0004-6256/145/4/102. S2CID 117144290.

[GaiaEDR3-4] 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.

[houdebine2019-5] Houdebine, Éric R.; Mullan, D. J.; Doyle, J. G.; de la Vieuville, Geoffroy; Butler, C. J.; Paletou, F. (2019). "The Mass-Activity Relationships in M and K Dwarfs. I. Stellar Parameters of Our Sample of M and K Dwarfs". The Astronomical Journal. 158 (2): 56. arXiv:1905.07921. Bibcode:2019AJ....158...56H. doi:10.3847/1538-3881/ab23fe. S2CID 159041104.

[gaidos2014-6] Gaidos, E.; Mann, A. W.; Lépine, S.; Buccino, A.; James, D.; Ansdell, M.; Petrucci, R.; Mauas, P.; Hilton, E. J. (2014). "Trumpeting M dwarfs with CONCH-SHELL: A catalogue of nearby cool host-stars for habitable exoplanets and life". Monthly Notices of the Royal Astronomical Society. 443 (3): 2561. arXiv:1406.7353. Bibcode:2014MNRAS.443.2561G. doi:10.1093/mnras/stu1313. S2CID 119234492.

[mcdonald2017-7] McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. S2CID 73594365.

[stelzer2013-8] Stelzer, B.; Marino, A.; Micela, G.; López-Santiago, J.; Liefke, C. (2013). "The UV and X-ray activity of the M dwarfs within 10 pc of the Sun". Monthly Notices of the Royal Astronomical Society. 431 (3): 2063. arXiv:1302.1061. Bibcode:2013MNRAS.431.2063S. doi:10.1093/mnras/stt225. S2CID 119193975.

[simbad-9] "GJ 445". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved July 29, 2008.

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Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Image of AC +79 3888 (circled), also known as Gliese 445, located 17.1 light-years from Earth Credit: Caltech/Palomar
Constellation	Camelopardalis
Right ascension	11^h 47^m 41.3885^s^[1]
Declination	+78° 41′ 28.179″^[1]
Apparent magnitude (V)	10.80^[2]
Characteristics
Spectral type	M4.0Ve^[3]
B−V color index	1.572^[2]
Astrometry

Radial velocity (R_v)	−111.707^[1] km/s
Proper motion (μ)	RA: 748.111^[1] mas/yr Dec.: 480.804^[1] mas/yr
Parallax (π)	190.3251 ± 0.0194 mas^[4]
Distance	17.137 ± 0.002 ly (5.2542 ± 0.0005 pc)
Absolute magnitude (M_V)	12.227^[5]

Details

Mass	0.14^[6] `M`_☉
Radius	0.285^[5] `R`_☉
Luminosity	0.008^[7] `L`_☉
Surface gravity (log g)	4.72^[7] cgs
Temperature	3,507^[1] K
Metallicity [Fe/H]	−0.30^[5] dex
Rotational velocity (v sin i)	<2.5^[8] km/s

Other designations
Gliese 445, Gl 445, G 254-29, AC+79 3888, HIP 57544, LFT 849, LHS 2459, LTT 13235, NLTT 28539, PLX 2722^[9]
Database references
SIMBAD	data
ARICNS	data
Gliese 445 Location of Gliese 445 in the constellation Camelopardalis