Theia 290
0.22
UTI
0.0
CN
0.17
Cdens
0.75
CC3
0.1
Clit
1.0
Cdup
Nm (P>50%)
23
Core radius and density
1.5 [pc], 0.8 [pc-2]
- CN 0.0 Sparse
- Cdens 0.17 Very loose
- CC3 0.75 High 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 290 is a sparse, very loose object of high C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low 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 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 | 262.459 | -35.703 | 1.153 | -1.315 | -3.776 | -3.191 |
| Hunt & Reffert | 2024 | 262.465 | -35.75 | 1.15 | -1.327 | -3.778 | 0.782 |
| Cavallo et al. | 2024 | 262.481 | -35.71 | 1.149 | â | â | â |
| Hunt & Reffert | 2023 | 262.465 | -35.75 | 1.15 | -1.327 | -3.778 | 0.782 |
| Kounkel & Covey | 2019 | 262.562 | -35.644 | 1.183 | â | â | 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 | 0.81 | 0.88 | 0.73 | 98 | -0.760 | 74 | â | â |
| Liu et al. | 2025 | 1.17 | 0.31 | â | 98 | â | â | â | â |
| Hunt & Reffert | 2024 | 0.81 | 0.88 | 0.73 | 103 | â | 74(1) | â | â |
| Cavallo et al. | 2024 | 0.73 | 1.39 | â | 59 | -0.760 | â | â | â |
| Hunt & Reffert | 2023 | 0.81 | 0.88 | 0.73 | 103 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.85 | 0.82 | â | 90 | 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 tidal capture (resonant trapping binary) 251 along with HSC_2885.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.99 (50th percentile), true positive (human-assigned).
Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.99 (50th percentile), true positive (human-assigned).