Theia 625
0.10
UTI
0.0
CN
0.17
Cdens
0.25
CC3
0.03
Clit
1.0
Cdup
Nm (P>50%)
22
Core radius and density
1.5 [pc], 0.9 [pc-2]
- CN 0.0 Sparse
- Cdens 0.17 Very loose
- CC3 0.25 Low quality
- Clit 0.03 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 625 is a sparse, very loose object of low C3 quality. Its parallax locates it at a close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (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 | 289.445 | -13.779 | 1.892 | 5.821 | 0.491 | -24.004 |
| Cavallo et al. | 2024 | 289.247 | -14.213 | 1.908 | â | â | â |
| Hunt & Reffert | 2023 | 289.447 | -13.775 | 1.9 | 5.84 | 0.281 | -14.966 |
| Kounkel & Covey | 2019 | 288.064 | -12.756 | 2.109 | â | â | 4.082 |
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 | 0.5 | 0.61 | 0.98 | 166 | -0.160 | â | â | â |
| Cavallo et al. | 2024 | 0.52 | 0.76 | â | 120 | -0.160 | â | â | â |
| Hunt & Reffert | 2023 | 0.50 | 0.32 | 0.98 | 166 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.47 | 0.61 | â | 288 | â | â | â | â |
Palma et al. (2025)
Classified as optical pair P475, along with HSC_255.
Cavallo et al. (2024)
Gold 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).