Lambda Ophiuchi
From Infogalactic: the planetary knowledge core
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 16h 30m 54.8229s[1] |
| Declination | +01° 59′ 02.123″[1] |
| Apparent magnitude (V) | 3.90[2] |
| Characteristics | |
| Spectral type | A0V+[2] |
| U−B color index | +0.01[3] |
| B−V color index | +0.01[3] |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | –13.5[4] km/s |
| Proper motion (μ) | RA: –31.37 mas/yr Dec.: –73.00 mas/yr |
| Parallax (π) | 19.63 ± 1.34[1] mas |
| Distance | 170 ± 10 ly (51 ± 3 pc) |
| Details | |
| Rotational velocity (v sin i) | 138[5] km/s |
| Other designations | |
Lambda Ophiuchi (λ Oph, λ Ophiuchi) is a binary star[6] system in the constellation Ophiuchus. It has the traditional name Marfik (or "Marsik"), meaning "the elbow" in Arabic.
Lambda Ophiuchi belongs to spectral class A1V+A and has apparent magnitude +3.82. It is approximately 166 light years from Earth.
References
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