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Beta Delphini |
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation (pronunciation) |
Delphinus |
| Right ascension | 20h 37m 32.9411s |
| Declination | +14° 35' 42.313"' |
| Apparent magnitude (V) | 3.632 |
| Characteristics | |
| Spectral type | F5 IV |
| U-B color index | ? |
| B-V color index | ? |
| Variable type | None |
| Astrometry | |
| Radial velocity (Rv) | -22.7 km/s |
| Proper motion (μ) | RA: 118.28 mas/yr Dec.: -47.65 mas/yr |
| Parallax (π) | 33.49 ± 0.88 mas |
| Distance | 97 ± 3 ly (29.9 ± 0.8 pc) |
| Absolute magnitude (MV) | 4.044 |
| Details | |
| Mass | > 2 / < 2 M☉ |
| Radius | ? R☉ |
| Surface gravity (log g) | ? |
| Luminosity | 18 / 8 L☉ |
| Temperature | ? K |
| Metallicity | ? |
| Rotation | ? |
| Age | ? years |
| Visual binary orbit | |
| Companion | Beta Delphini B |
| Period (P) | 26.7 yr |
| Semimajor axis (a) | 8 - 18 AU" |
| Eccentricity (e) | 0 |
| Inclination (i) | 0° |
| Longitude of the node (Ω) | 0° |
| Periastron epoch (T) | 0 |
| Other designations | |
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2E 4395, JP11 3257, TYC 1100-1720-1, bet Del, GC 28709, 2MASS J20373291+1435421, UBV 17888, 6 Del, GCRV 12902, N30 4554, UBV M 25011, BU 151AB, PLX 4906, BU 151, GSC 01100-01720, ROT 3004, YZ 14 8041, ADS 14073 AB, HIC 101769, 1RXS J203732.7+143537, BD+14° 4369, HIP 101769, SAO 106316, CCDM J20375+1436AB, HR 7882, SBC7 821, CSI+14° 4369 1, IDS 20328+1415, 2E 2035.2+1425, IRC +10473, TD1 27036.
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| Database references | |
| SIMBAD | data |
Beta Delphini, also known as Beta Del, is a multiple star in the constellation Delphinus. As a practical joke, the astronomer Niccolò Cacciatore gave it the name Rotanev, which is a reversal of his Latinized family name, Venator. The star has five components; components A and B are a physical binary; C, D, and E are optical.
| Observation data Epoch J2000.0 (ICRS) Equinox J2000.0 (ICRS) |
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|---|---|
| Constellation (pronunciation) |
Delphinus |
| Right ascension | 20h 37m 33.7s/30.9s/25.3s |
| Declination | +14° 35′ 33″ +14° 36′ 17″ +14° 35′ 46″ |
| Apparent magnitude (V) | 13.1/11.0/unknown |
| Other designations | |
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CCDM J20375+1436C/D/E; also, see designations for Beta Delphini A/B
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See also
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