Theia 888
0.12
UTI
0.0
CN
0.03
Cdens
0.38
CC3
0.1
Clit
1.0
Cdup
Nm (P>50%)
23
Core radius and density
3.8 [pc], 0.1 [pc-2]
- CN 0.0 Sparse
- Cdens 0.03 Very loose
- CC3 0.38 Low 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 888 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 | 355.833 | 55.945 | 1.086 | -6.602 | -2.467 | -27.859 |
| Hu & Soubiran | 2025 | 356.216 | 55.976 | â | â | â | â |
| Yang et al. | 2025 | 355.581 | 55.944 | â | â | â | â |
| Cavallo et al. | 2024 | 356.216 | 55.976 | 1.078 | â | â | â |
| Hunt & Reffert | 2023 | 355.581 | 55.944 | 1.082 | -6.51 | -2.423 | -29.091 |
| Kounkel & Covey | 2019 | 355.066 | 55.412 | 1.225 | â | â | -24.797 |
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 | 0.91 | 0.56 | 0.35 | 455 | -0.140 | â | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.140(5) | â | â | â |
| Yang et al. | 2025 | â | â | â | 427 | -0.060(3) | â | â | â |
| Cavallo et al. | 2024 | 0.92 | 0.73 | â | 741 | -0.160 | â | â | â |
| Hunt & Reffert | 2023 | 0.91 | 0.39 | 0.35 | 426 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.82 | 0.56 | â | 483 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.99 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).