RSG8

(OCSN 258)

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0.87 UTI
0.84
CN
0.93
Cdens
1.0
CC3
0.86
Clit
0.97
Cdup
C3 classification AA
Number of members (P>50%) 345
Radius (P>50% members) 61.2 [arcmin]
  • CN 0.84 Rich
  • Cdens 0.93 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.86 Well-studied
  • Cdup 0.97 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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RSG8 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, young cluster (see Parameters). It is well-studied in the literature.

Note: This is a unique object, which shares a very small percentage of members with at least one previously reported entry. See table with shared members information.

Very close Low extinction Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for RSG8 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 – 345.424 59.366 2.065 5.59 -1.668 -7.678
Li et al. 2025 344.983 59.371 2.21 5.343 -1.654 –
Almeida et al. 2025 345.032 59.37 – – – –
Alfonso et al. 2024 -14.769 59.221 2.077 5.537 -1.602 –
Zhang et al. 2024 345.453 59.509 – – – –
Hunt & Reffert 2024 345.453 59.509 2.057 5.664 -1.716 -9.656
Celli et al. 2024 344.983 59.371 – – – –
Cavallo et al. 2024 345.761 59.394 2.05 – – –
Hunt & Reffert 2023 345.453 59.509 2.057 5.664 -1.716 -9.656
Qin et al. 2023 344.85 59.25 2.15 5.67 -1.54 -7.96
He et al. 2022 346.619 58.966 2.139 5.807 -1.665 –
Dias et al. 2021 345.032 59.37 2.194 5.374 -1.564 -9.41
Cantat-Gaudin et al. 2020 344.983 59.371 2.21 5.343 -1.654 –
Cantat-Gaudin & Anders 2020 344.983 59.371 2.21 5.343 -1.654 –
Soubiran et al. 2018 344.983 59.371 – – – -9.64
Cantat-Gaudin et al. 2018 344.983 59.371 2.21 5.343 -1.654 –
Roser et al. 2016 344.54 59.16 – 5.81 -0.7 –

💡 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] Bfr BSS
Li et al. 2025 0.44 0.61 – 30 0.039 – – –
Almeida et al. 2025 0.45 0.64 – 37 – 343 – –
Alfonso et al. 2024 0.43 0.53 – 30 -0.023 – – –
Zhang et al. 2024 – – – – -0.086* – – –
Hunt & Reffert 2024 – – – – – 83* – –
Celli et al. 2024 – – – 27 – 205 – –
Cavallo et al. 2024 0.51 0.83 – 9 -0.140 – – –
Hunt & Reffert 2023 0.47 0.42 0.62 14 – – – –
Qin et al. 2023 0.66 0.87 – 20 – – – –
He et al. 2022 – 1.15 – 18 – – – –
Dias et al. 2021 0.45 0.64 – 37 -0.023 – – –
Cantat-Gaudin et al. 2020 0.43 0.53 – 27 – – – –
Cantat-Gaudin & Anders 2020 0.45 – – – – – – –
Soubiran et al. 2018 0.45 – – – – – – –
Cantat-Gaudin et al. 2018 0.45 – – – – – – –
Roser et al. 2016 0.33 0.16* – 316* – – – –

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWWDL 14636 18.6 345.54 59.54 2.04 5.66 -1.67 -9.39 0.0
NGC 7429 3.2 344.03 59.88 2.36 4.81 -2.19 -12.68 0.82
CWWDL 14622 2.3 345.68 58.22 2.25 5.43 -1.31 -8.93 0.35
CWWDL 14638 2.3 344.12 59.28 2.29 5.37 -0.9 -14.39 0.1

💡 Note: The % column shows the percentage of members that RSG8 shares with each listed object.

Visualization
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RSG8 UCC
RSG8 HUNT23
RSG8 CANTAT20
Galactocentric position diagram