View source for Gliese 445

{{Short description|Star in the constellation Camelopardalis}}
{{Sky|11|47|41.3885|+|78|41|28.179|17.1}}
{{Starbox begin}}
{{Starbox image
| image = [[File:PIA17461 Heading toward Gliese 445 (annotated).jpg|320px]]
| caption = Image of AC +79 3888 (circled), also known as Gliese 445, located 17.1 light-years from Earth
| credit = Caltech/Palomar
}}
{{Starbox observe
| epoch=[[J2000.0]]
| equinox=[[J2000.0]] ([[International Celestial Reference System|ICRS]])
| constell=[[Camelopardalis (constellation)|Camelopardalis]]
| ra={{RA|11|47|41.3885}}<ref name=dr2/>
| dec={{DEC|+78|41|28.179}}<ref name=dr2/>
| appmag_v=10.80<ref name=ucac2>{{cite journal |bibcode=2004yCat.1294....0U |title=VizieR Online Data Catalog: The UCAC2 Bright Star Supplement (Urban+, 2006) |last1=Urban |first1=S. E. |last2=Zacharias |first2=N. |last3=Wycoff |first3=G. L. |last4=Observatory |first4=U. S. Naval |last5=Washington |first5=D. C. |journal=VizieR On-line Data Catalog |year=2004 }}</ref>
}}
{{Starbox character
| class=M4.0Ve<ref name=lepine2013>{{cite journal |bibcode=2013AJ....145..102L |title=A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky |last1=Lépine |first1=Sébastien |last2=Hilton |first2=Eric J. |last3=Mann |first3=Andrew W. |last4=Wilde |first4=Matthew |last5=Rojas-Ayala |first5=Bárbara |last6=Cruz |first6=Kelle L. |last7=Gaidos |first7=Eric |journal=The Astronomical Journal |year=2013 |volume=145 |issue=4 |pages=102 |doi=10.1088/0004-6256/145/4/102 |arxiv=1206.5991 |s2cid=117144290 }}</ref>
| b-v=1.572<ref name=ucac2/>
| v-i=2.53<ref name=ucac2/>
}}
{{Starbox astrometry
| radial_v=−111.707<ref name=dr2>{{cite DR2|1129149723913123456}}</ref>
| prop_mo_ra=748.111<ref name=dr2/>
| prop_mo_dec=480.804<ref name=dr2/>
| parallax=190.3251
| p_error=0.0194
| parallax_footnote=<ref name="GaiaEDR3">{{Cite Gaia EDR3|1129149723913123456}}</ref>
| absmag_v = 12.227<ref name=houdebine2019>{{cite journal |bibcode=2019AJ....158...56H |title=The Mass-Activity Relationships in M and K Dwarfs. I. Stellar Parameters of Our Sample of M and K Dwarfs |last1=Houdebine |first1=Éric R. |last2=Mullan |first2=D. J. |last3=Doyle |first3=J. G. |last4=de la Vieuville |first4=Geoffroy |last5=Butler |first5=C. J. |last6=Paletou |first6=F. |journal=The Astronomical Journal |year=2019 |volume=158 |issue=2 |pages=56 |doi=10.3847/1538-3881/ab23fe |arxiv=1905.07921 |s2cid=159041104 |doi-access=free }}</ref>
}}
{{Starbox detail
| mass=0.14<ref name=gaidos2014>{{cite journal |bibcode=2014MNRAS.443.2561G |title=Trumpeting M dwarfs with CONCH-SHELL: A catalogue of nearby cool host-stars for habitable exoplanets and life |last1=Gaidos |first1=E. |last2=Mann |first2=A. W. |last3=Lépine |first3=S. |last4=Buccino |first4=A. |last5=James |first5=D. |last6=Ansdell |first6=M. |last7=Petrucci |first7=R. |last8=Mauas |first8=P. |last9=Hilton |first9=E. J. |journal=Monthly Notices of the Royal Astronomical Society |year=2014 |volume=443 |issue=3 |pages=2561 |doi=10.1093/mnras/stu1313 |doi-access=free |arxiv=1406.7353 |s2cid=119234492 }}</ref>
| radius=0.285<ref name=houdebine2019/>
| temperature = 3,507<ref name=dr2/>
| luminosity = 0.008<ref name=mcdonald2017>{{cite journal |bibcode=2017MNRAS.471..770M|title=Fundamental parameters and infrared excesses of Tycho-Gaia stars|last1=McDonald|first1=I.|last2=Zijlstra|first2=A. A.|last3=Watson|first3=R. A.|journal=Monthly Notices of the Royal Astronomical Society|year=2017|volume=471|issue=1|pages=770|doi=10.1093/mnras/stx1433|doi-access=free |arxiv=1706.02208|s2cid=73594365}}</ref>
| metal_fe = {{val|-0.30}}<ref name=houdebine2019/>
| gravity = 4.72<ref name=mcdonald2017/>
| rotational_velocity = <2.5<ref name=stelzer2013>{{cite journal |bibcode=2013MNRAS.431.2063S |title=The UV and X-ray activity of the M dwarfs within 10 pc of the Sun |last1=Stelzer |first1=B. |last2=Marino |first2=A. |last3=Micela |first3=G. |last4=López-Santiago |first4=J. |last5=Liefke |first5=C. |journal=Monthly Notices of the Royal Astronomical Society |year=2013 |volume=431 |issue=3 |pages=2063 |doi=10.1093/mnras/stt225 |doi-access=free |arxiv=1302.1061 |s2cid=119193975 }}</ref>
}}
{{Starbox catalog
|names= Gliese 445, Gl 445, G 254-29, AC+79 3888, [[Hipparcos Catalogue|HIP]] 57544, [[Luyten Five-Tenths catalogue|LFT]] 849, [[Luyten Half-Second catalogue|LHS]] 2459, [[Luyten Two-Tenths catalogue|LTT]] 13235, [[New Luyten Two-Tenths catalogue|NLTT]] 28539, [[General Catalogue of Trigonometric Parallaxes|PLX]] 2722<ref name=simbad>{{cite simbad|title=GJ 445|access-date=July 29, 2008}}</ref>
}}
{{Starbox reference
| Simbad=LHS+2459
| ARICNS=00910
}}
{{Starbox image
|image={{Location map|100x100|AlternativeMap=Camelopardalis_constellation_map.svg
|alt=Gliese 445 is located in the constellation Camelopardalis
|caption=Location of Gliese 445 in the constellation [[Camelopardalis (constellation)|Camelopardalis]]|border=infobox|mark=Red_pog.png|width=320
|label=Gliese 445
|lat=82.9
|long=23.1
}}|caption=
}}
{{Starbox end}}

'''Gliese 445''' ('''Gl 445''' or '''AC +79 3888''') is an [[Stellar classification#Class M|M-type]] [[main sequence]] [[star]] in the northern part of the constellation [[Camelopardalis]].

==Location==
[[File:Near-stars-past-future-en.svg|thumb|left|Distances of the [[List of nearest stars|nearest stars]] from 20,000 years ago until 80,000 years in the future]]
Gliese 445 is currently 17.1 [[light-year]]s 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.<ref name="Littmann">{{cite book|author=Mark Littmann|title=Planets Beyond: Discovering the Outer Solar System|url=https://books.google.com/books?id=RoJMadct4TQC|date=1 January 2004|publisher=Courier Corporation|isbn=978-0-486-43602-9}}</ref> 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.<ref name="Littmann"/> Gliese 445 is also a known X-ray source.<ref name=Schmitt>{{cite journal |author1=Schmitt JHMM |author2=Fleming TA |author3=Giampapa MS |title=The X-Ray View of the Low-Mass Stars in the Solar Neighborhood |journal=Astrophys. J. |date=September 1995 |volume=450 |issue=9 |pages=392–400 |bibcode=1995ApJ...450..392S |doi=10.1086/176149 |doi-access=free }}</ref>

The ''[[Voyager 1]]'' probe will pass within 1.6 light-years of Gliese 445 in about 40,000 years.<ref>{{cite web |url=http://voyager.jpl.nasa.gov/mission/interstellar.html |title=NASA – Voyager - Mission - Interstellar Mission |website=[[Jet Propulsion Laboratory]] |access-date=2020-04-03 |archive-date=2009-10-15 |archive-url=https://web.archive.org/web/20091015172229/http://voyager.jpl.nasa.gov/mission/interstellar.html |url-status=live }}</ref>

{{clear|left}}

== 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 [[parsec]]s (3.45 light-years) from the Sun,<ref name="Bobylev:arXiv1003.2160">{{cite journal |last=Bobylev |first=Vadim V. |date=March 2010 |title=Searching for Stars Closely Encountering with the Solar System |journal=Astronomy Letters |volume=36 |issue=3 |pages=220–226 |doi=10.1134/S1063773710030060 |arxiv=1003.2160 |bibcode=2010AstL...36..220B|s2cid=118374161 }}</ref> but with less than half the brightness necessary to be seen with the naked eye.<ref name="Littmann"/> 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==
* [[Lists of stars]]

==References==
{{Reflist|2}}

== External links ==
*Wikisky [http://www.wikisky.org/?ra=11.794826499999997&de=78.69115999999998&zoom=8&show_grid=1&show_constellation_lines=1&show_constellation_boundaries=1&show_const_names=0&show_galaxies=1&show_box=1&box_ra=11.7948265&box_de=78.69116&box_width=50&box_height=50&img_source=DSS2 image] {{Webarchive|url=https://web.archive.org/web/20190602151258/http://www.wikisky.org/?ra=11.794826499999997&de=78.69115999999998&zoom=8&show_grid=1&show_constellation_lines=1&show_constellation_boundaries=1&show_const_names=0&show_galaxies=1&show_box=1&box_ra=11.7948265&box_de=78.69116&box_width=50&box_height=50&img_source=DSS2 |date=2019-06-02 }} of TYC 4553-192-1 (Gliese 445)
{{Nearest systems|4}}
{{Stars of Camelopardalis}}
{{Portal bar|Astronomy|Stars|Spaceflight|Outer space|Solar System}}
{{DEFAULTSORT:Gliese 445}}
[[Category:Camelopardalis]]
[[Category:M-type main-sequence stars]]
[[Category:Hipparcos objects|057544]]
[[Category:Gliese and GJ objects|0445]]
[[Category:Emission-line stars]]
[[Category:TIC objects]]