Riddle 6
(MWSC 3478)
0.67
UTI
0.76
CN
0.98
Cdens
1.0
CC3
0.3
Clit
1.0
Cdup
Stellar density (N50/rad)
4.9 [N/pc2]
- CN 0.76 Rich
- Cdens 0.98 Very dense
- CC3 1.0 Very high quality
- Clit 0.3 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
Riddle 6 is a rich, very dense object of very high C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster (see Parameters). It is poorly studied in the literature.
Note: This object shares a moderate 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 | 318.035 | 59.902 | 1.173 | -2.527 | -3.511 | -23.218 |
| Liu et al. | 2025 | 317.97 | 59.98 | 1.18 | -2.5 | -3.51 | -22.37 |
| Hunt & Reffert | 2024 | 317.968 | 59.983 | 1.178 | -2.497 | -3.505 | -22.366 |
| Cavallo et al. | 2024 | 317.923 | 60.058 | 1.177 | â | â | â |
| Hunt & Reffert | 2023 | 317.968 | 59.983 | 1.178 | -2.497 | -3.505 | -22.366 |
| Bica et al. | 2019 | 317.931 | 59.968 | â | â | â | â |
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 | 0.93 | 1.26 | 1.67 | 9 | 0.490 | 105 | â | â |
| Liu et al. | 2025 | 1.20 | 0.46 | â | 20 | â | â | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 105(1) | â | â |
| Cavallo et al. | 2024 | 0.93 | 1.26 | â | 9 | 0.490 | â | â | â |
| Hunt & Reffert | 2023 | 0.81 | 1.37 | 1.67 | 9 | 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 302 along with OC_0158, and of multiple system 49 along with HSC_764 and OC_0158.
Dias et al. (2002)
Asterism (Kronberger, M. 2005, private communication); cat V3.5 (Jan 2016)
Palma et al. (2025)
Part of multiple system G222, along with OC_0158 and HSC_764.
Cavallo et al. (2024)
Gold sample.