41 G. Arae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ara[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 5.48[3] (5.61 / 8.88)[4] |
| Characteristics | |
| Spectral type | G8V + M0V[5] |
| U−B Template:Engvar | +0.38[6] |
| B−V Template:Engvar | +0.80[7] |
| R−I Template:Engvar | +0.41[7] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[2] km/s |
| Proper motion (μ) | RA: 1029.610 mas/yr[2] Dec.: 106.935 mas/yr[2] |
| Parallax (π) | 113.7513±0.0725 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 5.74[8] |
| Orbit[9] | |
| Primary | 41 G. Ara A |
| Companion | 41 G. Ara B |
| Period (P) | Script error: No such module "val". yr |
| 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".° |
| Semi-amplitude (K1) (primary) | Script error: No such module "val". km/s |
| Orbit[9] | |
| Primary | 41 G. Ara Ba |
| Companion | 41 G. Ara Bb |
| Period (P) | 0.24069 yr |
| Semi-major axis (a) | Script error: No such module "val".″ |
| Eccentricity (e) | 0.773 |
| 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 | |
| 41 G. Ara A | |
| Mass | 0.87[9] Template:Solar mass |
| Radius | 0.79[10] Template:Solar radius |
| Luminosity | 0.42Script error: No such module "Unsubst". Template:Solar luminosity |
| Surface gravity (log g) | 4.5[7] cgs |
| Temperature | 5,305[7] K |
| Metallicity [Fe/H] | −0.35[7] dex |
| Rotational velocity (v sin i) | 4.5[11] km/s |
| Age | 5.5–6.3[12] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| 41 G. Ara Ba | |
| Mass | 0.60[9] Template:Solar mass |
| Radius | 0.650[5] Template:Solar radius |
| 41 G. Ara Bb | |
| Mass | 0.42[9] Template:Solar mass |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| 41 G. Arae, CD−46°11370, GJ 666, HD 156274, HIP 84720, HR 6416, LHS 444, LTT 6886, SAO 227816, LPM 636, LFT 1334 | |
| Database references | |
| SIMBAD | 41 G. Ara |
| 41 G. Ara A | |
| 41 G. Ara B | |
| ARICNS | 41 G. Ara A |
| 41 G. Ara B | |
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41 G. Arae (abbreviated to 41 G. Ara), also known as Gliese 666, is a trinary star system in the constellation Ara Script error: No such module "convert". from the Sun. Although often called just 41 Arae, it is more accurate to call it 41 G. Arae, as the number 41 is the Gould designation and not the Flamsteed designation.
Characteristics
41 G. Arae is a hierarchical triple star system, made up of an outer pair, 41 G. Arae A and B, and an inner pair, 41 G. Arae Ba and Bb.[13] Two other visual companions were proposed, but neither share the system's motion.[14] 41 G. Arae A and B share a highly eccentric orbit that takes around a millenium to complete. since 2025[update]Template:Dated maintenance category (articles)Script error: No such module "Check for unknown parameters"., the last periastron was in 1908.[9]
The primary star in this system is a G-type main sequence star with a stellar classification of G8V. It has about 81% of the mass of the Sun, and 79% of the Sun's radius.[10]
The secondary component of the outer binary, 41 G. Arae B, is a pair of red dwarfs that complete an orbit around each other every 88 days,[13] and are also in an eccentric orbit.[9] 41 G. Arae Ba and Bb have masses of 0.60 and 0.41 solar masses, respectively.[9] It has a peculiar spectrum that shows a deficiency in elements with a higher atomic number than helium.[15]
Motion
This system has a relatively high proper motion, moving over a second of arc across the sky each year. The space velocity components of this system are [U, V, W] = [+38, +30, −19] km/s.[7] The stars in this system show low chromospheric activity, and have a net space velocity of 52 km/s relative to the Sun. This, in combination with their low metallicity, shows that the pair belongs to the old disk population.[7]
See also
References
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- ↑ Template:Cite constellation
- ↑ a b c d e Template:Cite Gaia DR3
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External links
- 41 G. Arae 2 SolStation entry.
- HR 6416
- Image 41 G Arae
- HIC 84720
- CCDM 17191-4638