Phi2 Hydrae
| Observation data ICRS )
| |
|---|---|
| Constellation | Hydra |
| Right ascension | 10h 36m 16.65960s[1] |
| Declination | −16° 20′ 39.5778″[1] |
| Apparent magnitude (V) | 6.0943[2] |
| Characteristics | |
| Spectral type | M1 III[3] |
| U−B color index | +1.95[4] |
| B−V color index | +1.64[4] |
| Variable type | SR[5] |
| Absolute magnitude (MV) | −0.80[6] |
| Details | |
| Luminosity | 703[7] L☉ |
| Temperature | 3,791[7] K |
| Database references | |
| SIMBAD | data |
Phi2 Hydrae,
ν Hydrae
.
| Period (days) |
Amplitude (magnitude) |
|---|---|
| 11.0 | 0.008 |
| 110.3 | 0.012 |
| 153.6 | 0.015 |
This is an
semiregular variable that undergoes changes in luminosity according to three pulsation periods.[5] The star is radiating an estimated 703[7] times the Sun's luminosity from its photosphere at an effective temperature of 3,791 K.[7]
Phi2 Hydrae has a faint visual companion: a magnitude 12.20 star at an
arc seconds along a position angle of 280°, as of 1959.[11]
References
- ^ S2CID 18759600.
- ^ S2CID 59451347, A61.
- Bibcode:1988mcts.book.....H.
- ^ Bibcode:1986EgUBV........0M.
- ^ S2CID 15358380.
- S2CID 119257644.
- ^ S2CID 118665352.
- ^ "* phi02 Hya". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-17.
{{cite web}}: CS1 maint: postscript (link) - S2CID 118445625.
- ^ doi:10.1086/116239.
- doi:10.1086/323920.