Theia 862
0.15
UTI
0.0
CN
0.07
Cdens
0.38
CC3
0.16
Clit
1.0
Cdup
Nm (P>50%)
24
Core radius and density
2.2 [pc], 0.3 [pc-2]
- CN 0.0 Sparse
- Cdens 0.07 Very loose
- CC3 0.38 Low quality
- Clit 0.16 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 862 is a sparse, very loose object of low C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is rarely studied in the literature.
â ī¸ Warning: the low UTI value and no obvious signs of duplication (Cdup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 37.578 | 56.614 | 1.409 | 0.184 | -3.647 | -27.934 |
| Yang et al. | 2025 | 37.4 | 56.746 | â | â | â | â |
| Zhang et al. | 2024 | 37.4 | 56.746 | â | â | â | â |
| Hunt & Reffert | 2024 | 37.4 | 56.746 | 1.395 | 0.227 | -3.708 | -26.477 |
| Cavallo et al. | 2024 | 38.353 | 56.367 | 1.394 | â | â | â |
| Hunt & Reffert | 2023 | 37.4 | 56.746 | 1.395 | 0.227 | -3.708 | -26.477 |
| He et al. | 2022 | 37.751 | 56.632 | 1.412 | 0.163 | -3.618 | â |
| Kounkel & Covey | 2019 | 38.945 | 56.258 | 1.387 | â | â | -20.008 |
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 | 0.7 | 1.08 | 2.41 | 287 | -0.079 | 70 | â | â |
| Yang et al. | 2025 | â | â | â | 257 | -0.100(3) | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | -0.079(1) | â | â | â |
| Hunt & Reffert | 2024 | 0.68 | 1.08 | 2.41 | 258 | â | 70(1) | â | â |
| Cavallo et al. | 2024 | 0.74 | 1.35 | â | 316 | 0.220 | â | â | â |
| Hunt & Reffert | 2023 | 0.68 | 1.08 | 2.41 | 258 | â | â | â | â |
| He et al. | 2022 | â | 1.30 | â | 794 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.72 | 0.75 | â | 420 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Palma et al. (2025)
Part of multiple system G250, along with Theia_1432, Theia_863 and Trumpler_2.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.34 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.34 (50th percentile).