Astronomy:Platais 8
| a Carinae Cluster | |
|---|---|
| Observation data (J2000.0 epoch) | |
| Constellation | Carina |
| Right ascension | 09h 06m 52.3s[1] |
| Declination | −58° 41′ 06″[1] |
| Distance | 440±1 ly (134.9±0.6 pc[1]) |
| Apparent dimensions (V) | 3.45° × 3.45°[1] |
| Physical characteristics | |
| Mass | 546+265−178[2] M☉ |
| Radius | 37.2 ± 4.9 ly (11.4 ± 1.5 pc)[2] |
| Estimated age | 60±15 Ma[3] |
| Other designations | Platais 8, HIP 45080 Cluster, MWSC 1629 |
Platais 8, also known as the a Carinae cluster or HIP 45080 Cluster is a small and faint open cluster located in the southern constellation Carina. It is estimated to be 440 light years distant based on parallax measurements.[1]
The cluster was first noticed by astronomer Imants Platais in 1998.[4] A 2005 paper suggests that Platais 8 might have formed near the area where the Scorpius-Centaurus association is located. [5] The SIMBAD database lists the cluster having 28,185 members[6] but the majority of the stars are field stars. In fact, there are only 32 members physically associated with the cluster.[1] The cluster has a combined mass of 546 M☉ and a radius of 37.2 light years Platais 8 is rather young, with an age of only 60 million years.[3]
Members
These are the members of the cluster as identified by Canat-Gaudin et al. (2018)
| Name | mv | MK Type | Dist. (ly) | Notes |
|---|---|---|---|---|
| HD 76230 | 6.57 | A0 V | 410 | Binary |
| HD 78802 | 7.33 | A2 IV | 467 | |
| HD 76413 | 7.48 | A3 V | 417 | |
| HD 80628 | 7.57 | A0/1 V | 442 | |
| HD 78761 | 7.68 | A2 V | 454 | |
| HD 78027 | 7.88 | A1 V | 444 |
The cluster also has one potential stream star located in Volans[1] and was considered to be a background object prior to 2020.
| Name | mv | MK Type | Dist. (ly) | Notes |
|---|---|---|---|---|
| HD 71863 | 5.94 | G8/K0 III | 421 | HR 3346 |
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Cantat-Gaudin, T.; Anders, F. (January 2020). "Clusters and mirages: cataloguing stellar aggregates in the Milky Way". Astronomy & Astrophysics 633: A99. doi:10.1051/0004-6361/201936691. ISSN 0004-6361. Bibcode: 2020A&A...633A..99C.
- ↑ 2.0 2.1 Piskunov, A. E.; Schilbach, E.; Kharchenko, N. V.; Röser, S.; Scholz, R.-D. (26 March 2007). "Towards absolute scales for the radii and masses of open clusters". Astronomy & Astrophysics 468 (1): 151–161. doi:10.1051/0004-6361:20077073. ISSN 0004-6361. Bibcode: 2007A&A...468..151P.
- ↑ 3.0 3.1 Vande Putte, D.; Garnier, T. P.; Ferreras, I.; Mignani, R. P.; Cropper, Mark (6 September 2010). "A kinematic study of open clusters: implications for their origin". Monthly Notices of the Royal Astronomical Society 407 (4): 2109–2121. doi:10.1111/j.1365-2966.2010.17025.x. ISSN 0035-8711. Bibcode: 2010MNRAS.407.2109V.
- ↑ Platais, Imants; Kozhurina-Platais, Vera; van Leeuwen, Floor (November 1998). "A Search for Star Clusters from the ]Hipparcos Data". The Astronomical Journal 116 (5): 2423–2430. doi:10.1086/300606. ISSN 0004-6256. Bibcode: 1998AJ....116.2423P.
- ↑ Piskunov, A. E.; Kharchenko, N. V.; Röser, S.; Schilbach, E.; Scholz, R.-D. (16 December 2005). "Revisiting the population of Galactic open clusters". Astronomy & Astrophysics 445 (2): 545–565. doi:10.1051/0004-6361:20053764. ISSN 0004-6361. Bibcode: 2006A&A...445..545P.
- ↑ "Cl Platais 8". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Cl+Platais+8.
- ↑ Cantat-Gaudin, T.; Jordi, C.; Vallenari, A.; Bragaglia, A.; Balaguer-Núñez, L.; Soubiran, C.; Bossini, D.; Moitinho, A. et al. (October 2018). "A Gaia DR2 view of the open cluster population in the Milky Way". Astronomy & Astrophysics 618: A93. doi:10.1051/0004-6361/201833476. ISSN 0004-6361. Bibcode: 2018A&A...618A..93C.
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