Lambda Capricorni
A-type main sequenece star in the constellation Capricornus
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Lambda Capricorni is a solitary[7] star in the southern constellation of Capricornus. Its name is a Bayer designation that is Latinized from λ Capricorni, and abbreviated Lambda Cap or λ Cap. This star is faintly visible to the naked eye with an apparent visual magnitude of +5.56.[3] Based upon an annual parallax shift of 11.58 mas as seen from the Earth,[2] the star is located 271 light-years (83 pc) from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.11 due to interstellar dust.[8] It is drifting closer with a line of sight velocity of −2 km/s.[2] This star is subject to lunar occultations because of its position near the ecliptic.[9]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Capricornus[1] |
| Right ascension | 21h 46m 32.097s[2] |
| Declination | −11° 21′ 57.44″[2] |
| Apparent magnitude (V) | +5.56[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | A1 V[4] |
| B−V color index | −0.01[3] |
| Astrometry | |
| Radial velocity (Rv) | −2.32±0.51[2] km/s |
| Proper motion (μ) | RA: +29.007 mas/yr[2] Dec.: −9.420 mas/yr[2] |
| Parallax (π) | 12.0253±0.0711 mas[2] |
| Distance | 271 ± 2 ly (83.2 ± 0.5 pc) |
| Absolute magnitude (MV) | +0.89[1] |
| Details | |
| Mass | 2.50±0.04[2] M☉ |
| Radius | 2.21±0.05[2] R☉ |
| Luminosity | 48.89+0.8 −0.7[2] L☉ |
| Surface gravity (log g) | 3.99+0.02 −0.01[2] cgs |
| Temperature | 10,247+51 −42[2] K |
| Rotational velocity (v sin i) | 192.5±5.7[5] km/s |
| Age | 271±64[2] Myr |
| Other designations | |
| λ Cap, 48 Cap, BD−12°6087, FK5 818, HD 207052, HIP 107517, HR 8319, SAO 164639[6] | |
| Database references | |
| SIMBAD | data |
This is a white-hued A-type main sequence star with a stellar classification of A1 V.[4] It has been listed as a magnetic Ap star, indicating the spectrum displays chemically peculiar features.[5] However, its status as a true Ap star is disputed.[10] The star has an estimated 2.50 times the mass of the Sun and about 2.21 times the Sun's radius.[2] It is 271[2] million years old and is spinning rapidly with a projected rotational velocity of 192.5 km/s.[5] Lambda Capricorni is radiating 49 times the Sun's luminosity from its photosphere at an effective temperature of 10,247 K.[2]
This star is a member of the HSC 396 cluster of stars, which was discovered in 2023.[10]