Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Leo Minor |
Right ascension | 09h 30m 43.22705s [1] |
Declination | +33° 39′ 20.5700″ [1] |
Apparent magnitude (V) | 5.86±0.01 [2] |
Characteristics | |
Evolutionary stage | horizontal branch [3] |
Spectral type | G9 III [4] |
B−V color index | +1.05 [5] |
Astrometry | |
Radial velocity (Rv) | 1.7±0.9 [6] km/s |
Proper motion (μ) |
RA: −23.939
mas/
yr
[1] Dec.: −48.160 mas/ yr [1] |
Parallax (π) | 7.0542 ± 0.1338 mas [1] |
Distance | 462 ± 9
ly (142 ± 3 pc) |
Absolute magnitude (MV) | −0.03 [7] |
Details | |
Mass | 2.74+0.24 −0.25 [3] M☉ |
Radius | 13.41±0.68 [8] R☉ |
Luminosity | 96.0+3.3 −3.6 [1] L☉ |
Surface gravity (log g) | 2.49+0.07 −0.06 [3] cgs |
Temperature | 4,923±122 [9] K |
Metallicity [Fe/H] | −0.03±0.10 [10] dex |
Rotational velocity (v sin i) | 0.24 [11] km/s |
Age | 575+201 −139 [3] Myr |
Other designations | |
Database references | |
SIMBAD | data |
7 Leonis Minoris (7 LMi) is a star located in the northern constellation Leo Minor. It is also designated as HD 82087 and HR 3764. 7 LMi is faintly visible to the naked eye as a yellow-hued point of light with an apparent magnitude of 5.86. [2] Gaia DR3 parallax measurements imply a distance of 462 light-years [1] and it is currently receding with a heliocentric radial velocity of 1.7 km/s. [6] At its current distance, 7 LMi's brightness is diminished by 0.12 magnitudes due to interstellar extinction [13] and it has an absolute magnitude of −0.03. [7]
There have been disagreements on the object's stellar classification. 7 LMi is either a G-type giant star with a class of either G8 or G9 III, [4] or it is a K-type giant with a class of K0 III. [14] It is most likely on the horizontal branch (95% fit), [3] generating energy via helium fusion at its core. It has 2.74 times the mass of the Sun but at the age of 575 million years, [3] it has expanded to 13.41 times the radius of the Sun. [8] It radiates 96 times the luminosity of the Sun [1] from its enlarged photosphere at an effective temperature of 4,923 K. [9] 7 LMi has a near solar metallicity at [Fe/H] = −0.03 [10] and it spins very slowly with a projected rotational velocity of 0.24 km/s. [11]
7 LMi has two visual companions. AG +33°954 is a background star located much farther away than 7 LMi [15] and it is a close spectroscopic binary itself. [16]
Companion | Stellar classification | PA (deg) | Separation (arcsec) | Apparent magnitude |
---|---|---|---|---|
AG +33°954 (B) | G8 IV-V [4] | 125 | 61.3 | 9.7 |
C | G5 V [4] | 217 | 95.9 | 11.6 |
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Leo Minor |
Right ascension | 09h 30m 43.22705s [1] |
Declination | +33° 39′ 20.5700″ [1] |
Apparent magnitude (V) | 5.86±0.01 [2] |
Characteristics | |
Evolutionary stage | horizontal branch [3] |
Spectral type | G9 III [4] |
B−V color index | +1.05 [5] |
Astrometry | |
Radial velocity (Rv) | 1.7±0.9 [6] km/s |
Proper motion (μ) |
RA: −23.939
mas/
yr
[1] Dec.: −48.160 mas/ yr [1] |
Parallax (π) | 7.0542 ± 0.1338 mas [1] |
Distance | 462 ± 9
ly (142 ± 3 pc) |
Absolute magnitude (MV) | −0.03 [7] |
Details | |
Mass | 2.74+0.24 −0.25 [3] M☉ |
Radius | 13.41±0.68 [8] R☉ |
Luminosity | 96.0+3.3 −3.6 [1] L☉ |
Surface gravity (log g) | 2.49+0.07 −0.06 [3] cgs |
Temperature | 4,923±122 [9] K |
Metallicity [Fe/H] | −0.03±0.10 [10] dex |
Rotational velocity (v sin i) | 0.24 [11] km/s |
Age | 575+201 −139 [3] Myr |
Other designations | |
Database references | |
SIMBAD | data |
7 Leonis Minoris (7 LMi) is a star located in the northern constellation Leo Minor. It is also designated as HD 82087 and HR 3764. 7 LMi is faintly visible to the naked eye as a yellow-hued point of light with an apparent magnitude of 5.86. [2] Gaia DR3 parallax measurements imply a distance of 462 light-years [1] and it is currently receding with a heliocentric radial velocity of 1.7 km/s. [6] At its current distance, 7 LMi's brightness is diminished by 0.12 magnitudes due to interstellar extinction [13] and it has an absolute magnitude of −0.03. [7]
There have been disagreements on the object's stellar classification. 7 LMi is either a G-type giant star with a class of either G8 or G9 III, [4] or it is a K-type giant with a class of K0 III. [14] It is most likely on the horizontal branch (95% fit), [3] generating energy via helium fusion at its core. It has 2.74 times the mass of the Sun but at the age of 575 million years, [3] it has expanded to 13.41 times the radius of the Sun. [8] It radiates 96 times the luminosity of the Sun [1] from its enlarged photosphere at an effective temperature of 4,923 K. [9] 7 LMi has a near solar metallicity at [Fe/H] = −0.03 [10] and it spins very slowly with a projected rotational velocity of 0.24 km/s. [11]
7 LMi has two visual companions. AG +33°954 is a background star located much farther away than 7 LMi [15] and it is a close spectroscopic binary itself. [16]
Companion | Stellar classification | PA (deg) | Separation (arcsec) | Apparent magnitude |
---|---|---|---|---|
AG +33°954 (B) | G8 IV-V [4] | 125 | 61.3 | 9.7 |
C | G5 V [4] | 217 | 95.9 | 11.6 |