88 Leonis is a wide binary[18] star system in the equatorial constellation of Leo, the lion. The system is near the lower limit of visibility to the naked eye with a combined apparent visual magnitude of 6.2.[19] It is located at a distance of 77 light years from the Sun based on parallax, but is drifting closer with a radial velocity of about −4.6 km/s. It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.379 arc seconds per annum.[20]
Quick facts Apparent magnitude (V), Characteristics ...
88 Leonis
Observation data
Epoch J2000.0 Equinox J2000.0 (ICRS) |
| Constellation |
Leo[1] |
| A |
| Right ascension |
11h 31m 44.94416s[2] |
| Declination |
+14° 21′ 52.2107″[2] |
| Apparent magnitude (V) |
6.27[3] |
| B |
| Right ascension |
11h 31m 44.41783s[4] |
| Declination |
+14° 22′ 05.6745″[4] |
| Apparent magnitude (V) |
9.22[5] |
| Characteristics |
| A |
| Evolutionary stage |
main sequence[2] |
| Spectral type |
F9.5V[6] |
| U−B color index |
+0.07[3] |
| B−V color index |
+0.57[3] |
| B |
| Evolutionary stage |
main sequence[7] |
| Spectral type |
G5[5] |
| U−B color index |
+1.03[8] |
| B−V color index |
+1.14[8] |
| Astrometry |
|---|
| A |
|---|
| Radial velocity (Rv) | −4.78±0.13[2] km/s |
| Proper motion (μ) | RA: −3329.873[2] mas/yr
Dec.: −189.925[2] mas/yr |
| Parallax (π) | 42.6536±0.0726 mas[4] |
| Distance | 76.5 ± 0.1 ly
(23.44 ± 0.04 pc) |
| Absolute magnitude (MV) | +4.30[9] |
| B |
|---|
| Radial velocity (Rv) | −4.59±0.17[4] km/s |
| Proper motion (μ) | RA: −315.623[4] mas/yr
Dec.: −181.122[4] mas/yr |
| Parallax (π) | 42.3382±0.0223 mas[4] |
| Distance | 77.04 ± 0.04 ly
(23.62 ± 0.01 pc) |
| Absolute magnitude (MV) | +7.31[9] |
| Details |
|---|
| 88 Leo A |
|---|
| Mass | 1.06[10] M☉ |
| Radius | 1.12[10] R☉ |
| Luminosity | 1.40[7] L☉ |
| Surface gravity (log g) | 4.25[11] cgs |
| Temperature | 5,990[10] K |
| Metallicity [Fe/H] | +0.03[10] dex |
| Rotation | 14.32 days[12] |
| Rotational velocity (v sin i) | 1.7[13] km/s |
| Age | 4.12[14] Gyr |
| 88 Leo B |
|---|
| Mass | 0.69[15] M☉ |
| Radius | 0.72[15] R☉ |
| Luminosity | 0.18[15] L☉ |
| Surface gravity (log g) | 4.57[15] cgs |
| Temperature | 4,423[15] K |
| Other designations |
|---|
| STF 1547 AB, 88 Leonis, BD+15°2345, HD 100180, HIP 56242, HR 4437, WDS J11317+1422, Wolf 401[16] |
| 88 Leo A: AG+14°1209, GJ 3669, SAO 99648, LTT 13145[16] |
| 88 Leo B: AG+14°1208, GJ 3670, SAO 99647, LTT 13146[17] |
| Database references |
|---|
| SIMBAD | data |
| B |
Close
The primary member of the system, component A, is a yellow-white hued F-type main-sequence star with a stellar classification of F9.5V.[6] It is an estimated 4.1 billion years old[14] and is spinning with a rotation period of 14.3 days.[12] The star has a short magnetic activity cycle that averages around 3.5 years. A second cycle appears to vary over time, lasting 13.7 years at the start of observations then decreasing to 8.6 years over a span of 34 years of measurement.[12] The star has 1.1 times the mass of the Sun and 1.1 times the Sun's radius.[10] It is radiating 1.5 times the luminosity of the Sun from its photosphere[7] at an effective temperature of 5,990 K.[10]
The secondary, component B, is a magnitude 9.22[5] star at an angular separation of 15.46″ from the primary along a position angle of 326°.[21] It has a class of G5[5] and 69% of the Sun's mass.[15] The pair share a common proper motion through space with a projected separation of 360.6 AU.[21]