Theia 2803
0.11
UTI
0.37
CN
1.0
Cdens
1.0
CC3
0.06
Clit
0.22
Cdup
Stellar density (N50/rad)
7.7 [N/pc2]
- CN 0.37 Poorly populated
- Cdens 1.0 Very dense
- CC3 1.0 Very high quality
- Clit 0.06 Rarely studied
- Cdup 0.22 Likely duplicate
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 2803 is a poorly populated, very dense object of very 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: This is likely a duplicate object, which shares a large percentage of members with at least one previously reported entry. See table with shared members information.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 263.156 | -30.871 | 0.638 | -0.748 | -2.713 | â |
| Liu et al. | 2025 | 263.15 | -30.85 | 0.62 | -0.75 | -2.68 | â |
| Hunt & Reffert | 2024 | 263.153 | -30.855 | 0.618 | -0.754 | -2.679 | â |
| Cavallo et al. | 2024 | 263.147 | -30.855 | 0.618 | â | â | â |
| Hunt & Reffert | 2023 | 263.153 | -30.855 | 0.618 | -0.754 | -2.679 | â |
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 | 1.5 | 2.58 | 1.23 | 42 | -0.830 | 473 | â | â |
| Liu et al. | 2025 | 3.78 | 0.90 | â | 42 | â | â | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 473(1) | â | â |
| Cavallo et al. | 2024 | 1.21 | 3.27 | â | 46 | -0.830 | â | â | â |
| Hunt & Reffert | 2023 | 1.50 | 2.58 | 1.23 | 29 | 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_2505, and of multiple system 82 along with Theia_2505 and Trumpler_26.
Palma et al. (2025)
Part of multiple system G240, along with Trumpler_26 and Theia_2505.
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).