Roslund 6

(OCSN 259)

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0.97 UTI
0.87
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 412
Stellar density (N50/rad) 12.6 [N/pc2]
C3 classification AA
  • CN 0.87 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
Roslund 6 is a rich, very dense object of very high 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, intermediate-age cluster, but with a large variance across recent sources for the absorption and age parameters (see Parameters). It is very well-studied in the literature.

Note: This object shares a small percentage of members with 2 later reported entries. See table with shared members information.

Yan et al. (2026)
Number of WDs: expected from single-star evolution N=2, with probability of formation through binary evolution >=0.5 N=4.

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 335 along with RSG_5, and of multiple system 79 along with RSG_5 and Theia_96.

Palma et al. (2025)
Classified as optical pair P88, along with CWNU_1075.

Almeida et al. (2025)
Mass determination: good fit. Isochrone match: good fit. Gold sample.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Richer et al. (2021)
The expected number of WDs is 5.4, 0 WD candidates found, and 0 WD candidates found in the wide search.

Data
🔍 Search references for Roslund 6 in: SciX Simbad
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Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 307.197 39.818 2.831 5.965 2.14 -8.066
Yan et al. 2026 307.593 40.356 2.831 5.95 2.13 –
Liu et al. 2025 307.59 40.36 2.83 5.95 2.13 -8.08
Li et al. 2025 307.185 39.798 2.809 5.875 2.155 –
Wei et al. 2025 307.597 40.315 2.851 6.039 2.193 –
Almeida et al. 2025 307.128 39.73 – – – –
Alfonso et al. 2024 307.184 39.853 2.798 5.897 2.041 –
Zhang et al. 2024 307.593 40.356 – – – –
Hunt & Reffert 2024 307.593 40.356 2.831 5.95 2.13 -8.082
Cavallo et al. 2024 307.179 39.765 2.833 – – –
Hunt & Reffert 2023 307.593 40.356 2.831 5.95 2.13 -8.082
Almeida et al. 2023 306.702 39.676 – – – –
Qin et al. 2023 307.4 40.0 2.83 5.95 2.15 -8.19
He et al. 2022 307.345 40.816 2.81 5.43 1.335 –
Tarricq et al. 2022 307.468 40.078 2.823 5.959 2.166 –
Richer et al. 2021 307.234 39.514 2.821 5.933 2.164 –
Dias et al. 2021 307.128 39.73 2.816 5.919 2.175 -7.1
Cantat-Gaudin et al. 2020 307.185 39.798 2.809 5.875 2.155 –
Zhong et al. 2020 307.185 39.798 – 5.875 2.155 -15.87
Cantat-Gaudin & Anders 2020 307.185 39.798 2.809 5.875 2.155 –
Bossini et al. 2019 307.185 39.798 – – – –
Soubiran et al. 2018 307.185 39.798 – – – -12.89
Cantat-Gaudin et al. 2018 307.185 39.798 2.809 5.875 2.155 –
Loktin & Popova 2017 307.2 39.327 – -0.733 -1.132 –
Dias et al. 2014 307.204 39.327 – -0.52 -4.17 –
Piskunov et al. 2008 307.197 39.256 – – – –
Piskunov et al. 2007 307.197 39.256 – – – –
Kharchenko et al. 2005 307.2 39.26 – 5.82 2.03 –
Kharchenko et al. 2003 307.23 39.19 – 5.71 0.33 –
Dias et al. 2002 307.204 39.327 – -0.52 -4.17 –

💡 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 99999– 0.365 0.17 0.44 168 0.070 244 0.365 –
Yan et al. 2026 – – – 89 – – – –
Liu et al. 2025 0.39 0.07 – 89 – – – –
Li et al. 2025 0.36 0.18 – 94 0.048 – – –
Wei et al. 2025 0.40 0.21 – 65 0.250 219 0.20 –
Almeida et al. 2025 0.35 0.12 – 259 – 270 – –
Alfonso et al. 2024 0.38 0.00 – 68 0.080 – – –
Zhang et al. 2024 – – – – 0.017(1) – – –
Hunt & Reffert 2024 – – – – – 320(1) – –
Cavallo et al. 2024 0.36 0.53 – 98 0.220 – – –
Hunt & Reffert 2023 0.34 0.07 0.44 168 – – – –
Almeida et al. 2023 0.35 0.06 – 327 0.070 502(1) 0.53 –
Qin et al. 2023 0.39 0.25 – 79 – – – –
He et al. 2022 – 0.35 – 79 – – – –
Tarricq et al. 2022 0.37 – – 91 – – – –
Richer et al. 2021 – 0.14 – 250 – – – –
Dias et al. 2021 0.35 0.12 – 259 0.078 – – –
Cantat-Gaudin et al. 2020 0.38 0.00 – 89 – – – –
Kounkel et al. 2020 0.36 0.18 – 288 – – – –
Zhong et al. 2020 0.33 0.15 – 7976 -0.010 – – –
Cantat-Gaudin & Anders 2020 0.35 – – – – – – –
Bossini et al. 2019 0.33 0.14 – 95 0.000 – – –
Soubiran et al. 2018 0.35 – – – – – – –
Cantat-Gaudin et al. 2018 0.35 – – – – – – –
Loktin & Popova 2017 0.96 1.82 – 334 – – – –
Piskunov et al. 2008 0.45 0.19 – 295 – 46(1) – –
Piskunov et al. 2007 0.45 0.19 – 295 – 14 – –
Kharchenko et al. 2005 0.45 0.19 – 295 – – – –
Kharchenko et al. 2003 0.50 0.16 – – – – – –
Dias et al. 2002 0.45 0.19 – 295 – – – –

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWWDL 14633 18.4 307.52 39.84 2.84 6.04 2.18 -7.77 0.0
CWWDL 14634 11.7 307.38 40.11 2.84 6.01 2.17 -7.94 0.0

💡 Note: The % column shows the percentage of members that Roslund 6 shares with each listed object.

Visualization
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Roslund 6 UCC
Roslund 6 HUNT23
Roslund 6 CANTAT20
Galactocentric position diagram