GJ 1245
Template:Short description Template:Sky
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus[1] |
| GJ 1245 AC | |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 13.46 / 16.75[3] |
| GJ 1245 B | |
| Right ascension | Template:RA[4] |
| Declination | Template:DEC[4] |
| Apparent magnitude (V) | 14.01[3] |
| Characteristics | |
| Spectral type | M6V / M8V[5] / M6V[6] |
| Variable type | UV Cet[7] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[4] km/s |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[4] Dec.: Script error: No such module "val". mas/yr[4] |
| Parallax (π) | 214.5745±0.0476 mas[4] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 15.12 / 18.41[5] / 15.72[3] |
| Orbit[8] | |
| Primary | GJ 1245 A |
| Companion | GJ 1245 C |
| Period (P) | Script error: No such module "val". days |
| Semi-major axis (a) | Script error: No such module "val".″ |
| Eccentricity (e) | Script error: No such module "val". |
| Inclination (i) | Script error: No such module "val".° |
| Longitude of the node (Ω) | Script error: No such module "val".° |
| Periastron epoch (T) | Script error: No such module "val". |
| Argument of periastron (ω) (secondary) | Script error: No such module "val".° |
| Details | |
| GJ 1245 A | |
| Mass | Script error: No such module "val".[5] Template:Solar mass |
| Radius | Script error: No such module "val".[5] Template:Solar radius |
| Luminosity | 0.0014[5] Template:Solar luminosity |
| Temperature | Script error: No such module "val".[5] K |
| Metallicity [Fe/H] | −0.07[5] dex |
| Age | ~300Script error: No such module "Unsubst". Myr |
| GJ 1245 C | |
| Mass | Script error: No such module "val".[5] Template:Solar mass |
| Radius | Script error: No such module "val".[5] Template:Solar radius |
| Luminosity | 0.0003[5] Template:Solar luminosity |
| Temperature | Script error: No such module "val".[5] K |
| Metallicity [Fe/H] | −0.08[5] dex |
| GJ 1245 B | |
| Mass | 0.115[9] Template:Solar mass |
| Radius | 0.142[9] Template:Solar radius |
| Luminosity | 0.00123[9] Template:Solar luminosity |
| Surface gravity (log g) | 5.20[9] cgs |
| Temperature | 2.865[9] K |
| Metallicity [Fe/H] | −0.05[10] dex |
| Rotation | 0.71[11] days |
| Rotational velocity (v sin i) | 7[11] km/s |
| Age | 3.1[10] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist | |
| GJ 1245 AC: Template:Odlist[12] | |
| GJ 1245 B: Template:Odlist[6] | |
| Database references | |
| AC | |
| B | |
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GJ 1245 (Gliese 1245) is a double star with components G 208-44 and G 208-45, located Script error: No such module "convert". away in the constellation Cygnus. G 208-44 is itself a closer double star made up of two red dwarfs, while G 208-45 is also a red dwarf. GJ 1245 is the 43rd closest stellar system to the Solar System.[14] GJ 1245 A and B are both active flare stars,[15] and the pair are collectively designated V1581 Cygni.[16]
The largest of the three stars, GJ 1245 A (G 208-44 A) is only 12% the Sun's mass.[5] Of the other two stars, GJ 1245 C (G 208-44 B), is closest to star A at 2 AU away;[17] it is 8% of the Sun's mass.[5] The third star, GJ 1245 B (G 208-45), is 27 AU away from star A,[17] and is estimated to complete an orbit every 279 years.[18] It is slightly smaller and less luminous than GJ 1245 A.[9]
See also
References
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Further reading
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- Script error: No such module "Citation/CS1". Table with parallaxes.