Gliese 445

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Gliese 445
PIA17461 Heading toward Gliese 445 (annotated).jpg
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 [1]
Right ascension 11h 47m 41.3869s [2]
Declination +78° 41′ 28.176″ [2]
Apparent magnitude  (V)10.80 [3]
Characteristics
Evolutionary stage main sequence [4]
Spectral type M4.0Ve [4]
B−V color index 1.572 [3]
Astrometry
Radial velocity (Rv)−111.50±0.15 [2] km/s
Proper motion (μ)RA: 748.418 mas/yr [2]
Dec.: 480.804 mas/yr [2]
Parallax (π)190.3251±0.0194  mas [2]
Distance 17.137 ± 0.002  ly
(5.2542 ± 0.0005  pc)
Absolute magnitude  (MV)12.227 [5]
Details
Mass 0.24±0.02 [6]   M☉
Radius 0.266±0.005 [6]   R☉
Luminosity 0.008 [7]   L☉
Surface gravity (log g)4.72 [7]   cgs
Temperature 3,356±31 [6]   K
Metallicity [Fe/H]−0.30 [5]   dex
Rotational velocity (v sin i)<2.5 [8]  km/s
Other designations
GJ 445, HIP 57544, AC +79 3888, G 254-29, LFT 849, LHS 2459, LTT 13235, NLTT 28539, PLX 2722 [9]
Database references
SIMBAD data
ARICNS data
Camelopardalis constellation map.svg
Red pog.png
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.

Contents

Location

Distances of the nearest stars from 20,000 years ago until 80,000 years in the future Near-stars-past-future-en.svg
Distances of the nearest stars from 20,000 years ago until 80,000 years in the future

Gliese 445 is currently 17.1 light-years from Earth and has an apparent magnitude of 10.8. It is visible all night long from locations north of the Tropic of Cancer, but not to the naked eye. [10] Because the star is a red dwarf with a mass only a quarter to a third of that of the Sun, scientists question the ability of this system to support life. [10] Gliese 445 is also a known X-ray source. [11]

The Voyager 1 probe will pass within 1.6 light-years of Gliese 445 in about 40,000 years. [12]

Solar encounter

While the Voyager probe moves through space towards a 1.6-light-year minimum distance from Gliese 445, the star is rapidly approaching the Sun. At the time the probe passes Gliese 445, the star will be about 1.059 parsecs (3.45 light-years) from the Sun, [13] but with less than half the brightness necessary to be seen with the naked eye. [10] At that time, Gliese 445 will be approximately tied with Ross 248 for being the closest star to the Sun (see List of nearest stars and brown dwarfs#Distant future and past encounters).

See also

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific . 99 (617): 695. Bibcode:1987PASP...99..695R. doi: 10.1086/132034 . Constellation record for this object at VizieR.
  2. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 Urban, S. E.; Zacharias, N.; Wycoff, G. L.; Observatory, U. S. Naval; Washington, D. C. (2004). "VizieR Online Data Catalog: The UCAC2 Bright Star Supplement (Urban+, 2006)". VizieR On-line Data Catalog. Bibcode:2004yCat.1294....0U.
  4. 1 2 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.
  5. 1 2 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.
  6. 1 2 3 Donati, J.-F.; Lehmann, L. T.; et al. (October 2023). "Magnetic fields and rotation periods of M dwarfs from SPIRou spectra". Monthly Notices of the Royal Astronomical Society . 525 (2): 2015–2039. arXiv: 2307.14190 . Bibcode:2023MNRAS.525.2015D. doi: 10.1093/mnras/stad2301 .
  7. 1 2 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.
  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.
  9. ↑ "GJ 445". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved July 29, 2008.
  10. 1 2 3 Mark Littmann (1 January 2004). Planets Beyond: Discovering the Outer Solar System. Courier Corporation. ISBN   978-0-486-43602-9.
  11. ↑ Schmitt JHMM; Fleming TA; Giampapa MS (September 1995). "The X-Ray View of the Low-Mass Stars in the Solar Neighborhood". Astrophys. J. 450 (9): 392–400. Bibcode:1995ApJ...450..392S. doi: 10.1086/176149 .
  12. ↑ "NASA – Voyager - Mission - Interstellar Mission". Jet Propulsion Laboratory . Archived from the original on 2009-10-15. Retrieved 2020-04-03.
  13. ↑ Bobylev, Vadim V. (March 2010). "Searching for Stars Closely Encountering with the Solar System". Astronomy Letters. 36 (3): 220–226. arXiv: 1003.2160 . Bibcode:2010AstL...36..220B. doi:10.1134/S1063773710030060. S2CID   118374161.
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