45 Cancri
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 5.62[2] |
| Characteristics | |
| Spectral type | G8 III and A3 III[3] |
| B−V Template:Engvar | Script error: No such module "val".[2] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[2] km/s |
| Proper motion (μ) | RA: −9.828[1] mas/yr Dec.: +0.916[1] mas/yr |
| Parallax (π) | 4.7700±0.1025 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −1.62[2] |
| Orbit[4] | |
| Period (P) | Script error: No such module "val". |
| Eccentricity (e) | Script error: No such module "val". |
| Semi-amplitude (K1) (primary) | Script error: No such module "val". km/s |
| Semi-amplitude (K2) (secondary) | Script error: No such module "val". km/s |
| Details | |
| 45 Cnc A | |
| Mass | Script error: No such module "val".[3] Template:Solar mass |
| Radius | Script error: No such module "val".[1] Template:Solar radius |
| Luminosity | Script error: No such module "val".[1] Template:Solar luminosity |
| Surface gravity (log g) | 2.72[5] cgs |
| Temperature | 5,058[5] K |
| Metallicity [Fe/H] | Script error: No such module "val".[5] dex |
| Rotational velocity (v sin i) | 5.3[6] km/s |
| 45 Cnc B | |
| Mass | Script error: No such module "val".[3] Template:Solar mass |
| Luminosity | Script error: No such module "val".[3] Template:Solar luminosity |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[7] | |
| Database references | |
| SIMBAD | data |
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45 Cancri is a binary star[4] system in the zodiac constellation of Cancer, located 680 light-years away from the Sun.[1] It has the Bayer designation A1 Cancri;[8] 45 Cancri is the Flamsteed designation. It is visible to the naked eye as a faint, white-hued star at an apparent visual magnitude of 5.62.[2] The pair form a double-lined spectroscopic binary with an orbital period of Script error: No such module "convert". and an eccentricity of 0.46.[4] They are drifting closer to the Earth with a heliocentric radial velocity of −6 km/s.[2]
The primary, designated component A, is an aging giant star with a stellar classification of G8 III,[9] but has most likely not yet made multiple ascents up the red giant branch.[3] It has 3.11[3] times the mass of the Sun and has expanded to 14[1] times the Sun's radius. The star is radiating 210[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of Script error: No such module "val"..[5] The less evolved secondary, component B is likewise a giant star, having a class of A3 III. It has three times the mass of the Sun and shines with 191 times the Sun's luminosity.[3]
References
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- ↑ a b c d e f g h i j Template:Cite Gaia DR2
- ↑ a b c d e f Script error: No such module "citation/CS1".
- ↑ a b c d e f g Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".Script error: No such module "Unsubst".
- ↑ Template:Cite simbad
- ↑ HD 74228, HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index, N. D. Kostjuk, Institute of Astronomy of Russian Academy of Sciences, 2002; CDS ID IV/27A.
- ↑ Script error: No such module "citation/CS1".
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