Pi Cephei
Jump to navigation
Jump to search
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.419[2] 4.61[3] + 6.75[4]) |
| Characteristics | |
| Spectral type | G7III[5] / F5V[5] / A7V-A9V[6] |
| U−B Template:Engvar | −0.46Script error: No such module "Unsubst". |
| B−V Template:Engvar | +0.8Script error: No such module "Unsubst". |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val". km/s |
| Proper motion (μ) | RA: Script error: No such module "val".[1] mas/yr Dec.: Script error: No such module "val".[1] mas/yr |
| Parallax (π) | 13.8±0.41 mas[6] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 0.24 |
| Orbit[5] | |
| Primary | π Cep Aa |
| Companion | π Cep Ab |
| Period (P) | Script error: No such module "val". |
| Semi-major axis (a) | Script error: No such module "val".[6] |
| Eccentricity (e) | Script error: No such module "val". |
| Inclination (i) | Script error: No such module "val".[6]° |
| Longitude of the node (Ω) | Script error: No such module "val".[6]° |
| 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[7] | |
| Primary | π Cephei A (Aa + Ab) |
| Companion | π Cephei 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) | B Script error: No such module "val". |
| Argument of periastron (ω) (secondary) | Script error: No such module "val".° |
| Details[6] | |
| π Cep Aa | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Surface gravity (log g) | Script error: No such module "val".[8] cgs |
| Temperature | Script error: No such module "val".[8] K |
| Metallicity [Fe/H] | Script error: No such module "val".[8] dex |
| Age | 100[8] Myr |
| π Cep Ab | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| π Cep B | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| HD 218658, HR 8819, 33 Cephei, BD+74°1006, SAO 10629, HIP 114222[9] | |
| Database references | |
| SIMBAD | data |
Script error: No such module "Check for unknown parameters".
Pi Cephei (π Cephei) is a trinary star located in the constellation Cepheus.[6] With a combined apparent magnitude of about 4.4,[2] the system is faintly visible to the naked eye. The inner pair of stars orbits in 1.5 years while the outer companion completes one orbit in about 160 years.[6]
Pi Cephei was found to have a visual companion star by Otto Wilhelm von Struve in 1843.[6] That the primary is itself a spectroscopic binary was first noticed by William Wallace Campbell in 1901 using photographic plates taken at Lick Observatory.[10]
References
<templatestyles src="Reflist/styles.css" />
- ↑ a b c d Script error: No such module "Citation/CS1". Vizier catalog entry
- ↑ a b Script error: No such module "Citation/CS1".Vizier catalog entry
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ a b c Script error: No such module "Citation/CS1".
- ↑ a b c d e f g h i Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "Citation/CS1".
- ↑ Template:Cite simbad
- ↑ Script error: No such module "Citation/CS1".
Script error: No such module "Check for unknown parameters".