Theia 11
0.48
UTI
0.34
CN
1.0
Cdens
1.0
CC3
0.03
Clit
1.0
Cdup
Nm (P>50%)
34
Core radius and density
0.8 [pc], 5.7 [pc-2]
- CN 0.34 Poorly populated
- Cdens 1.0 Very dense
- CC3 1.0 Very high 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 11 is a poorly populated, very dense object of very high C3 quality. Its parallax locates it at a very close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It is rarely studied in the literature.
Note: This object shares a large percentage of members with 3 later reported entries. See table with shared members information.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 341.517 | 75.134 | 2.905 | 7.387 | 0.292 | -16.689 |
| Cavallo et al. | 2024 | 341.089 | 75.238 | 2.915 | â | â | â |
| Hunt & Reffert | 2023 | 341.328 | 75.155 | 2.913 | 7.332 | 0.521 | -44.971 |
| Kounkel & Covey | 2019 | 341.373 | 75.182 | 2.79 | â | â | -5.477 |
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 | 0.36 | 0.8 | 1.77 | 6 | 0.170 | â | â | â |
| Cavallo et al. | 2024 | 0.39 | 1.85 | â | 6 | 0.170 | â | â | â |
| Hunt & Reffert | 2023 | 0.33 | 0.49 | 1.77 | 5 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.36 | 0.80 | â | 6 | â | â | â | â |
Palma et al. (2025)
Classified as optical pair (not dynamically associated) P87, along with Collinder_471.
Cavallo et al. (2024)
Silver sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.49 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.49 (50th percentile).