HD 182509
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 19h 27m 48.11739s[1] |
| Declination | −54° 19′ 30.9786″[1] |
| Apparent magnitude (V) | 5.69±0.01[2] |
| Characteristics | |
| Evolutionary stage | red giant branch[3] |
| Spectral type | K4 III[4] |
| U−B color index | +1.68[5] |
| B−V color index | +1.40[5] |
| Astrometry | |
| Radial velocity (Rv) | −5±4.3[6] km/s |
| Proper motion (μ) | RA: −5.554 mas/yr[1] Dec.: +9.807 mas/yr[1] |
| Parallax (π) | 5.1371±0.0763 mas[1] |
| Distance | 635 ± 9 ly (195 ± 3 pc) |
| Absolute magnitude (MV) | −0.38[7] |
| Details | |
| Mass | 1.12[8] M☉ |
| Radius | 32.6[9] R☉ |
| Luminosity | 329[10] L☉ |
| Surface gravity (log g) | 1.35[8] cgs |
| Temperature | 4,316±122[9] K |
| Metallicity [Fe/H] | −0.02[8] dex |
| Rotational velocity (v sin i) | <1[11] km/s |
| Other designations | |
| 59 G. Telescopii[12], CD−54°8308, CPD−54°9371, FK5 1504, GC 26834, HD 182509, HIP 95690, HR 7370, SAO 246110, WDS J19278-5420A[13] | |
| Database references | |
| SIMBAD | data |
HD 182509, also designated as HR 7370, is an orange hued star located in the southern constellation Telescopium. It has an apparent magnitude of 5.69,[2] making it faintly visible to the naked eye if viewed under ideal conditions. Parallax measurements place the object at a distance of 635 light years.[1] It has a poorly constrained heliocentric radial velocity of −5 km/s,[6] indicating that it is drifting towards the Solar System.
HD 182509 has a stellar classification of K4 III,[4] indicating that it is a red giant. Gaia DR3 stellar evolution models place it on the red giant branch.[3] It has 1.12 times the mass of the Sun[8] but has expanded to 32.6 times its girth.[9] It shines with a luminosity of 329 L☉[10] from its enlarged photosphere at an effective temperature of 4,316 K.[9] HD 182509 iron abundance is 95% that of the Sun, placing it at solar metallicity.[8] Like most giants, it spins slowly with a projected rotational velocity of <1 km/s.[11]
HD 182466 is a high proper motion star located 76.1″ away along a position angle of 236°.[14] Eggleton and Tokovonin (2008) list the pair as a binary star.[15] However, its parallax and proper motion indicate that it is instead a foreground object.[16] Components C and D are instead faint optical background objects, while the E component is probably non-existent.[14]
