Theia 228
0.21
UTI
0.5
CN
0.1
Cdens
0.38
CC3
0.03
Clit
1.0
Cdup
Nm (P>50%)
51
Core radius and density
4.1 [pc], 0.5 [pc-2]
- CN 0.5 Moderately populated
- Cdens 0.1 Very loose
- CC3 0.38 Low quality
- Clit 0.03 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 228 is a moderately populated, very loose object of low C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young 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 | 300.629 | 20.211 | 3.036 | 0.32 | -5.502 | -20.232 |
| Cavallo et al. | 2024 | 301.868 | 21.024 | 3.008 | â | â | â |
| Hunt & Reffert | 2023 | 300.308 | 19.648 | 2.981 | 0.62 | -5.343 | -22.303 |
| Kounkel & Covey | 2019 | 300.971 | 19.925 | 3.145 | â | â | -0.427 |
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 | 0.33 | 0.19 | 0.57 | 97 | 0.300 | â | â | â |
| Cavallo et al. | 2024 | 0.35 | 0.44 | â | 54 | 0.300 | â | â | â |
| Hunt & Reffert | 2023 | 0.32 | 0.12 | 0.57 | 98 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.33 | 0.19 | â | 97 | â | â | â | â |
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.42 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.42 (50th percentile).