Theia 65
0.32
UTI
0.62
CN
0.15
Cdens
0.62
CC3
0.1
Clit
1.0
Cdup
Nm (P>50%)
73
Core radius and density
3.0 [pc], 0.7 [pc-2]
- CN 0.62 Moderately populated
- Cdens 0.15 Very loose
- CC3 0.62 Intermediate quality
- Clit 0.1 Rarely studied
- Cdup 1.0 Unique
đĨ Members
đ Colab
đŦ Bayestar19
MOCA
đ CDS
đ Simbad
đ CDS (Îą, δ)
đ Simbad (Îą, δ)
MOCA
đ CDS
đ Simbad
đ CDS (Îą, δ)
đ Simbad (Îą, δ)
Overview
Theia 65 is a moderately populated, very loose object of intermediate C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a low-mass, near-solar metallicity, very young cluster, but with a large variance across recent sources for the absorption and age parameters (see Parameters). It is rarely studied in the literature.
Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 84.151 | 23.453 | 9.201 | 5.726 | -37.56 | 13.769 |
| Swiggum et al. | 2024 | 84.259 | 23.516 | 9.263 | 6.165 | -37.626 | 13.653 |
| Cavallo et al. | 2024 | 83.862 | 23.398 | 9.263 | â | â | â |
| Hunt & Reffert | 2023 | 84.259 | 23.516 | 9.263 | 6.165 | -37.626 | 11.257 |
| He et al. | 2022 | 83.742 | 23.449 | 9.199 | 6.156 | -37.341 | â |
| Kounkel & Covey | 2019 | 84.102 | 23.276 | 9.27 | â | â | -13.416 |
đĄ Note: The UCC values are estimated from its identified members.
| Reference | Year | Dist [kpc] | Av [mag] | DAv [mag] | Age [Myr] | [Fe/H] [dex] | Mass [Msun] | Bfrac | BSS |
|---|---|---|---|---|---|---|---|---|---|
| UCC | 99999â | 0.11 | 0.345 | 0.51 | 16 | 0.290 | 30 | â | â |
| Swiggum et al. | 2024 | 0.11 | â | â | 9 | â | 30 | â | â |
| Cavallo et al. | 2024 | 0.11 | 1.19 | â | 107 | 0.290 | â | â | â |
| Hunt & Reffert | 2023 | 0.11 | 0.34 | 0.51 | 9 | â | â | â | â |
| He et al. | 2022 | â | 0.05 | â | 16 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.11 | 0.35 | â | 26 | â | â | â | â |
Palma et al. (2025)
Classified as optical pair P431, along with HSC_1460.
Cavallo et al. (2024)
Bronze sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 1.00 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).