Theia 775
0.06
UTI
0.0
CN
0.06
Cdens
0.12
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
24
Core radius and density
2.4 [pc], 0.3 [pc-2]
- CN 0.0 Sparse
- Cdens 0.06 Very loose
- CC3 0.12 Very low quality
- Clit 0.06 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 775 is a sparse, very loose object of very 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 | 356.713 | 62.781 | 1.199 | 1.263 | 0.803 | -18.047 |
| Yang et al. | 2025 | 356.867 | 62.817 | â | â | â | â |
| Cavallo et al. | 2024 | 355.402 | 62.279 | 1.196 | â | â | â |
| Hunt & Reffert | 2023 | 356.867 | 62.817 | 1.193 | 1.156 | 0.893 | -21.575 |
| Kounkel & Covey | 2019 | 355.747 | 62.295 | 1.23 | â | â | -8.086 |
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 | 0.81 | 1.18 | 2.19 | 214 | 0.105 | â | â | â |
| Yang et al. | 2025 | â | â | â | 138 | -0.200(3) | â | â | â |
| Cavallo et al. | 2024 | 0.88 | 1.21 | â | 288 | 0.410 | â | â | â |
| Hunt & Reffert | 2023 | 0.80 | 1.18 | 2.19 | 139 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.81 | 0.90 | â | 356 | 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 G199, along with Theia_153, HSC_900 and HSC_922.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.95 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.95 (50th percentile).