Theia 978
0.30
UTI
0.44
CN
0.19
Cdens
0.38
CC3
0.25
Clit
1.0
Cdup
Stellar density (N50/rad)
1.0 [N/pc2]
- CN 0.44 Poorly populated
- Cdens 0.19 Very loose
- CC3 0.38 Low 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 978 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a metal-rich, intermediate-age cluster (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 | 290.514 | 22.319 | 1.346 | -1.837 | -1.503 | -11.369 |
| Liu et al. | 2025 | 290.42 | 22.34 | 1.32 | -1.88 | -1.56 | -13.95 |
| Hunt & Reffert | 2024 | 290.421 | 22.341 | 1.315 | -1.881 | -1.559 | -13.945 |
| Cavallo et al. | 2024 | 290.383 | 22.432 | 1.316 | â | â | â |
| Hunt & Reffert | 2023 | 290.421 | 22.341 | 1.315 | -1.881 | -1.559 | -13.945 |
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 | 0.84 | 2.31 | 2.52 | 119 | 0.770 | 82 | â | â |
| Liu et al. | 2025 | 1.57 | 0.70 | â | 89 | â | â | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 82(1) | â | â |
| Cavallo et al. | 2024 | 0.84 | 2.33 | â | 120 | 0.770 | â | â | â |
| Hunt & Reffert | 2023 | 0.73 | 2.31 | 2.52 | 119 | 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 353 along with HSC_446, and as tidal capture (resonant trapping binary) 392 along with UPK_65, and of multiple system 81 along with HSC_446 and UPK_65.
Palma et al. (2025)
Part of multiple system G178, along with HSC_437, HSC_446, UPK_56 and UPK_65.
Cavallo et al. (2024)
Gold sample.