Epoch J2000.0 Equinox J2000.0
|Right ascension||12h 41m 53.05658s|
|Declination||+10° 14′ 51.1699″|
|Apparent magnitude (V)||+4.88|
|Spectral type||A0 V|
|U−B color index||+0.03|
|B−V color index||+0.09|
|Radial velocity (Rv)||+1.6 km/s|
|Proper motion (μ)||RA: +82.67 mas/yr
Dec.: –89.08 mas/yr
|Parallax (π)||27.57 ± 0.21 mas|
|Distance||118.3 ± 0.9 ly
(36.3 ± 0.3 pc)
|Surface gravity (log g)||4.36 cgs|
|Metallicity [Fe/H]||–1.00 dex|
|Rotational velocity (v sin i)||154 km/s|
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, 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.
Rho Virginis is an A-type main sequence star with a stellar classification of A0 V. It is larger than the Sun with a radius 60% larger and about twice the mass. As such it is generating energy at a higher rate than the Sun, with a luminosity 14 times greater. The outer atmosphere has an effective temperature of 8,930 K, 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, in which case the dusty disk has a radius of around 37 AU and a mean temperature of 90 K.
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