Theia 771
0.30
UTI
0.55
CN
0.12
Cdens
0.62
CC3
0.1
Clit
1.0
Cdup
Nm (P>50%)
60
Core radius and density
2.7 [pc], 0.6 [pc-2]
- CN 0.55 Moderately populated
- Cdens 0.12 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 771 is a moderately populated, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by low 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.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 199.083 | -59.231 | 1.163 | -14.952 | -1.81 | -11.525 |
| Hu & Soubiran | 2025 | 199.533 | -59.201 | â | â | â | â |
| Hunt & Reffert | 2024 | 198.889 | -59.23 | 1.164 | -14.932 | -1.808 | -12.502 |
| Cavallo et al. | 2024 | 199.533 | -59.201 | 1.161 | â | â | â |
| Hunt & Reffert | 2023 | 198.889 | -59.23 | 1.164 | -14.932 | -1.808 | -12.502 |
| Kounkel & Covey | 2019 | 197.9 | -59.703 | 1.249 | â | â | -6.283 |
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 | 0.66 | 0.56 | 361 | 0.250 | 50 | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.140(5) | â | â | â |
| Hunt & Reffert | 2024 | 0.82 | 0.66 | 0.56 | 326 | â | 50(1) | â | â |
| Cavallo et al. | 2024 | 0.78 | 0.47 | â | 525 | 0.640 | â | â | â |
| Hunt & Reffert | 2023 | 0.82 | 0.66 | 0.56 | 326 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.80 | 0.67 | â | 396 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Palma et al. (2025)
Classified as optical pair P570, along with Theia_1082.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).