Rho Virginis
 Location of ρ Virginis (circled) |
|
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 41m 53.05658s[1] |
| Declination | +10° 14′ 51.1699″[1] |
| Apparent magnitude (V) | +4.88[2] |
| Characteristics | |
| Spectral type | A0 V[3] |
| U−B color index | +0.03[4] |
| B−V color index | +0.09[4] |
| Astrometry | |
| Radial velocity (Rv) | +1.6[2] km/s |
| Proper motion (μ) | RA: +82.67[1] mas/yr Dec.: –89.08[1] mas/yr |
| Parallax (π) | 27.57 ± 0.21[1] mas |
| Distance | 118.3 ± 0.9 ly (36.3 ± 0.3 pc) |
| Details | |
| Mass | 2.0[5] M☉ |
| Radius | 1.6[5] R☉ |
| Luminosity | 14[5] L☉ |
| Surface gravity (log g) | 4.36[6] cgs |
| Temperature | 8,930[5] K |
| Metallicity [Fe/H] | –1.00[6] dex |
| Rotational velocity (v sin i) | 154[7] km/s |
| Other designations | |
Rho Virginis (ρ Vir, ρ Virginis) is the Bayer designation for a star in the constellation Virgo. It has an apparent visual magnitude of +4.9,[2] making it a challenge to view with the naked eye from an urban area (according to the Bortle Dark-Sky Scale). The distance to this star has been measured directly using the parallax method, which places it 118.3 light-years (36.3 parsecs) away with a margin of error of about a light year.[1]
Rho Virginis is an A-type main sequence star with a stellar classification of A0 V.[3] It is larger than the Sun with a radius 60%[5] larger and about twice the mass. As such it is generating energy at a higher rate than the Sun, with a luminosity 14[5] times greater. The outer atmosphere has an effective temperature of 8,930 K,[5] which is what gives it the white-hued glow of an A-type star. It is classified as a Delta Scuti type variable star and its brightness varies by 0.02 magnitudes over periods of 0.5 to 2.4 hours.
This star has been established as a Lambda Boötis star that displays low abundances of iron peak elements. It displays an excess of infrared emission, but it is unclear whether this is being caused by a circumstellar debris disk or from the star passing through and heating up a diffuse interstellar dust cloud. Most likely it is the former,[5] in which case the dusty disk has a radius of around 37 AU and a mean temperature of 90 K.[8]
References
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- ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
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