Gliese 445
Star in the constellation Camelopardalis
From Wikipedia, the free encyclopedia
Gliese 445 (Gl 445 or AC +79 3888) is an M-type main sequence star in the northern part of the northern circumpolar constellation of Camelopardalis.
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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 Equinox 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 |
  Gliese 445 Location of Gliese 445 in the constellation Camelopardalis | |
Location
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).
