Rho Aquarii
 Location of ρ Aquarii (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 20m 11.91628s[1] |
| Declination | –07° 49′ 15.9649″[1] |
| Apparent magnitude (V) | +5.34[2] |
| Characteristics | |
| Spectral type | B8 IIIp Mn:Hg:[3] |
| U−B color index | –0.358[2] |
| B−V color index | –0.057[2] |
| Astrometry | |
| Radial velocity (Rv) | –9[4] km/s |
| Proper motion (μ) | RA: +14.75[1] mas/yr Dec.: +1.84[1] mas/yr |
| Parallax (π) | 3.70 ± 0.38[1] mas |
| Distance | approx. 880 ly (approx. 270 pc) |
| Details | |
| Mass | 5.00 ± 0.22[5] M☉ |
| Luminosity | 1,035[5] L☉ |
| Temperature | 12,593[6] K |
| Rotational velocity (v sin i) | 65[3] km/s |
| Other designations | |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
Rho Aquarii (ρ Aqr, ρ Aquarii) is the Bayer designation for a binary star in the equatorial constellation of Aquarius. It is visible to the naked eye with an apparent visual magnitude of +5.34.[2] Based upon parallax measurements made during the Hipparcos mission, this star is at a distance of roughly 880 light-years (270 parsecs) from Earth.[1]
This is a single-lined spectroscopic binary, with the presence of a companion being revealed by Doppler shifts in the spectrum.[6] The primary is a giant star with a stellar classification of B8 IIIp Mn:Hg:.[3] It is a Mercury-Manganese star, showing a surfeit of these elements in the spectrum.[6] With five times the Sun's mass, this star is radiating 1,035[5] times as much luminosity from its outer atmosphere at an effective temperature of 12,593 K.[6] This heat gives it the blue-white hue of a B-type star.[8] The companion may be a variable star.[9]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 5.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 6.2 6.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
- HR 8512
- Image Rho Aquarii (English)
- Aladin sky atlas, image (English)
