HD 75289
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Vela |
| Right ascension | 08h 47m 40.3894s |
| Declination | –41° 44′ 12.452″ |
| Apparent magnitude (V) | 6.36 |
| Characteristics | |
| Spectral type | G0V |
| B−V color index | 0.58 |
| Astrometry | |
| Radial velocity (Rv) | +14 km/s |
| Proper motion (μ) | RA: –20.50 mas/yr Dec.: –227.68 mas/yr |
| Parallax (π) | 34.55 ± 0.56 mas |
| Distance | 94 ± 2 ly (28.9 ± 0.5 pc) |
| Absolute magnitude (MV) | 4.05 |
| Details | |
| Mass | 1.05 M☉ |
| Radius | 1.25 R☉ |
| Luminosity | 1.82 L☉ |
| Surface gravity (log g) | 4.25 cgs |
| Temperature | 6011 K |
| Metallicity | 0.29 |
| Rotation | ~24.6 |
| Age | 4.96 years |
| Other designations | |
HD 75289 is a 6th magnitude star in the constellation of Vela. Like our Sun, it is a yellow dwarf but slightly more massive, hotter and luminous. The spectral type of the star is G0 V. Under exceptionally good circumstances it might be visible to the unaided eye; however, usually binoculars are needed.
In 2004, a possible red dwarf companion was detected.
Planetary system
In 1999 a planet HD 75289 b with half the mass of Jupiter was detected by radial velocity method.[1] This planet is a typical hot Jupiter that takes only about 3.51 days to revolve at an orbital distance of 0.0482 AU.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >0.467 ± 0.041 MJ | 0.0482 ± 0.0028 | 3.509267 ± 0.000064 | 0.034 ± 0.029 | — | — |
HD 75289 B
| Observation data Epoch 2000 Equinox 2000 |
|
|---|---|
| Constellation | Vela |
| Right ascension | 8h 47m 42.24s |
| Declination | -41° 44' 7.70" |
| Apparent magnitude (V) | ? |
| Distance | 94.36? ly (28.94? pc) |
| Spectral type | M2-M5 V |
| Other designations | |
|
n/a
|
|
HD 75289 B is a possible red dwarf star orbiting HD 75289. The stars share the same proper motion so they are probably related. Apparent distance between the two stars is about 21.5 arcseconds, at a distance of 94 light years that would be 621 astronomical units. However, the radial distance between the stars is unknown, so they are probably further apart. In any case, one revolution around the primary would take thousands of years to complete.
The study that found the red dwarf also rules out any further stellar companions beyond 140 AU and massive brown dwarf companions from 400 AU up to 2000 AU.
References
External links
- SIMBAD star entry, planet entry, component B entry
- M. Mugrauer, R. Neuhäuser, T. Mazeh, J. Alves and E. Guenther: M. A low-mass stellar companion of the planet host star HD 75289
Coordinates: 
08h 47m 40.3894s, −41° 44′ 12.452″
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