Theia 227
0.20
UTI
0.0
CN
0.11
Cdens
0.75
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
22
Core radius and density
2.5 [pc], 0.6 [pc-2]
- CN 0.0 Sparse
- Cdens 0.11 Very loose
- CC3 0.75 High quality
- Clit 0.06 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 227 is a sparse, very loose object of high C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It is rarely studied in the literature.
Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.
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 | 272.02 | -16.619 | 2.08 | 0.008 | -3.873 | -12.302 |
| Swiggum et al. | 2024 | 272.09 | -16.473 | 2.108 | 0.019 | -3.979 | -12.325 |
| Cavallo et al. | 2024 | 271.641 | -17.488 | 2.104 | â | â | â |
| Hunt & Reffert | 2023 | 272.09 | -16.473 | 2.108 | 0.019 | -3.979 | -14.445 |
| Kounkel & Covey | 2019 | 271.662 | -16.434 | 3.165 | â | â | -7.754 |
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 | 0.465 | 1.35 | 1.9 | 34 | 0.000 | 201 | â | â |
| Swiggum et al. | 2024 | 0.47 | â | â | 32 | â | 201 | â | â |
| Cavallo et al. | 2024 | 0.47 | 1.45 | â | 36 | 0.000 | â | â | â |
| Hunt & Reffert | 2023 | 0.46 | 1.35 | 1.90 | 32 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.32 | 0.58 | â | 97 | â | â | â | â |
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.95 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.95 (50th percentile).