Theia 667
0.30
UTI
0.42
CN
0.07
Cdens
0.75
CC3
0.13
Clit
1.0
Cdup
Nm (P>50%)
42
Core radius and density
4.7 [pc], 0.3 [pc-2]
- CN 0.42 Poorly populated
- Cdens 0.07 Very loose
- CC3 0.75 High quality
- Clit 0.13 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 667 is a poorly populated, very loose object of high 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 | 352.604 | 64.014 | 1.262 | -4.882 | -4.875 | -9.579 |
| Yang et al. | 2025 | 352.486 | 63.993 | â | â | â | â |
| Hunt & Reffert | 2024 | 352.486 | 63.993 | 1.249 | -4.883 | -4.763 | -8.051 |
| Cavallo et al. | 2024 | 352.691 | 64.181 | 1.257 | â | â | â |
| Hunt & Reffert | 2023 | 352.486 | 63.993 | 1.249 | -4.883 | -4.763 | -8.051 |
| He et al. | 2022 | 352.334 | 64.068 | 1.263 | -4.888 | -4.823 | â |
| Kounkel & Covey | 2019 | 352.404 | 64.129 | 1.24 | â | â | -34.447 |
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 | 0.78 | 0.95 | 1.53 | 124 | 0.115 | 144 | â | â |
| Yang et al. | 2025 | â | â | â | 123 | -0.070(3) | â | â | â |
| Hunt & Reffert | 2024 | 0.75 | 0.95 | 1.53 | 124 | â | 144(1) | â | â |
| Cavallo et al. | 2024 | 0.82 | 1.17 | â | 191 | 0.300 | â | â | â |
| Hunt & Reffert | 2023 | 0.75 | 0.95 | 1.53 | 124 | â | â | â | â |
| He et al. | 2022 | â | 1.25 | â | 112 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.81 | 0.83 | â | 290 | 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 P586, along with UPK_219.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).