AG Draconis
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AG Draconis |
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| Observation data Epoch J2000 |
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|---|---|
| Constellation (pronunciation) |
Draco |
| Right ascension | 16h 01m 41.0135s |
| Declination | +66° 48' 10.139"' |
| Apparent magnitude (V) | 9.82 |
| Characteristics | |
| Spectral type | K0 |
| U-B color index | ? |
| B-V color index | ? |
| Variable type | nova variable |
| Astrometry | |
| Radial velocity (Rv) | -137.6 km/s |
| Proper motion (μ) | RA: -6.18 mas/yr Dec.: -5.47 mas/yr |
| Parallax (π) | -1.72 ± 0.98 mas |
| Distance | approx. -2000 ly (approx. -600 pc) |
| Absolute magnitude (MV) | 11.3 |
| Details | |
| Mass | 1.5 / 0.5 M☉ |
| Radius | 0.9 R☉ |
| Surface gravity (log g) | ? |
| Luminosity | 1500 L☉ |
| Temperature | 3.500–5.000 K |
| Metallicity | ? |
| Rotation | ? |
| Age | ? years |
| Visual binary orbit | |
| Companion | AG Draconis B |
| Period (P) | 1.516769336 yr |
| Semimajor axis (a) | 0.01081" |
| Other designations | |
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AG Dra, GCRV 9231, PPM 19692, TYC 4195-254-1, [[ AG]]+66° 715, RBS 1547, UBV 13635, BD+67° 922, GSC 04195-00254, 2RE J160133+664805, BPS BS 16087-0012, HIC 78512, 2RE J1601+664, 2E 1601.3+6656, HIP 78512, RX J1601.6+6648, AAVSO 1601+67, 2E 3573, IRAS 16013+6656, 1RXS J160141.2+664811, JP11 236, SAO 16931, 1ES 1601+66.9, 2MASS J16014101+6648101.
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| Database references | |
| SIMBAD | data |
AG Draconis is a binary system ( orange-red giant and a white dwarf). The star erupts every 10-15 years, it is a nova variable.
[edit] References
- http://jumk.de/astronomie/special-stars/ag-draconis.shtml
- http://hubblesite.org/newscenter/archive/releases/1999/32
[edit] See also
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