Theia 2505
0.30
UTI
0.0
CN
0.23
Cdens
0.75
CC3
0.25
Clit
1.0
Cdup
Stellar density (N50/rad)
1.1 [N/pc2]
- CN 0.0 Sparse
- Cdens 0.23 Very loose
- CC3 0.75 High quality
- Clit 0.25 Poorly 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 2505 is a sparse, very loose object of high C3 quality. Its parallax locates it at a relatively close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a metal-poor, young cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It was recently reported 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 | 263.275 | -30.007 | 0.646 | -0.735 | -2.651 | -8.231 |
| Liu et al. | 2025 | 263.25 | -30.02 | 0.64 | -0.76 | -2.66 | -18.22 |
| Hunt & Reffert | 2024 | 263.246 | -30.024 | 0.636 | -0.761 | -2.663 | -18.217 |
| Cavallo et al. | 2024 | 263.268 | -30.01 | 0.635 | â | â | â |
| Hunt & Reffert | 2023 | 263.246 | -30.024 | 0.636 | -0.761 | -2.663 | -18.217 |
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 | 1.48 | 1.76 | 2.15 | 32 | -0.760 | 285 | â | â |
| Liu et al. | 2025 | 2.33 | 0.58 | â | 32 | â | â | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 285(1) | â | â |
| Cavallo et al. | 2024 | 1.48 | 2.47 | â | 81 | -0.760 | â | â | â |
| Hunt & Reffert | 2023 | 1.48 | 1.76 | 2.15 | 24 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Liu et al. (2025)
Classified as primordial binary cluster 364 along with Theia_2803, and as tidal capture (resonant trapping binary) 371 along with Trumpler_26, and of multiple system 82 along with Theia_2803 and Trumpler_26.
Palma et al. (2025)
Part of multiple system G240, along with Theia_2803 and Trumpler_26.
Cavallo et al. (2024)
Silver sample.