7 Camelopardalis
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.43[2] (4.49 + ? + 7.90 + 11.30)[3] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A1 V[4] |
| B−V Template:Engvar | Script error: No such module "val".[2] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[5] km/s |
| Proper motion (μ) | RA: −24.51[1] mas/yr Dec.: +7.71[1] mas/yr |
| Parallax (π) | 8.77±0.60 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −0.84[2] |
| Orbit[6] | |
| Primary | 7 Cam Aa |
| Companion | 7 Cam Ab |
| Period (P) | 3.884 d |
| Eccentricity (e) | 0 |
| Periastron epoch (T) | Script error: No such module "val". |
| Argument of periastron (ω) (secondary) | 0° |
| Semi-amplitude (K1) (primary) | Script error: No such module "val". km/s |
| Details | |
| 7 Cam Aa | |
| Mass | Script error: No such module "val".[7] Template:Solar mass |
| Luminosity | Script error: No such module "val".[7] Template:Solar luminosity |
| Temperature | Script error: No such module "val".[7] K |
| Rotational velocity (v sin i) | 40[7] km/s |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[8] | |
| Database references | |
| SIMBAD | data |
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7 Camelopardalis is a multiple star system[9] in the northern circumpolar constellation of Camelopardalis. It is located approximately 370 light years from the Sun, as determined from its parallax.[1] This system is visible to the naked eye as a faint, white-hued star with a combined apparent visual magnitude of 4.43.[2] It is moving closer to the Earth with a heliocentric radial velocity of −10 km/s.[5]
The primary member of the group, designated component A, is a single-lined spectroscopic binary system with a circular orbit and a period of 3.88 days.[6] The visible component of this pair is a magnitude 4.49[3] A-type main-sequence star with a stellar classification of A1 V.[4] It has 3.2 times the mass of the Sun and is spinning with a projected rotational velocity of 40 km/s. The star is radiating 222 times the Sun's luminosity from its photosphere at an effective temperature of 9,226 K.[7]
The magnitude 7.90[3] component B has an orbital solution with the Aa/Ab pair, which yields a period of 284 years and an eccentricity of 0.74. However, Drummond (2014) found the data to be discordant and instead determined that they are an optical pair with no physical association.[10] The fourth member, component C, is a magnitude 11.30 star at an angular separation of Script error: No such module "val". along a position angle of 242° from the primary, as of 2003.[3] It shares a common proper motion with the primary star.[11]
References
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- ↑ a b c d e f Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ a b c d e Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Template:Cite Gaia EDR3
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