RSG8

(OCSN 258)

0.87 UTI

0.84

C_N

0.93

C_dens

1.0

C_C3

0.87

C_lit

0.97

C_dup

N₅₀ (P>50% members) 345

Stellar density (N₅₀/rad) 4.6 [N/pc²]

C3 classification AA

C_N 0.84 Rich
C_dens 0.93 Very dense
C_C3 1.0 Very high quality
C_lit 0.87 Well-studied
C_dup 0.97 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, 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

Palma et al. (2025)
Classified as tidal capture (resonant trapping pair) P59, along with HSC_899.

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg53' along with RSG 7.

Cavallo et al. (2024)
Gold sample.

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

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	99999–	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
Spina et al.	2021	345.102	59.386	2.178	5.47	-1.643	–
Cantat-Gaudin et al.	2020	344.983	59.371	2.21	5.343	-1.654	–
Zhong et al.	2020	344.983	59.371	–	5.343	-1.654	-26.517
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]	B_frac	BSS
UCC	99999–	0.45	0.61	0.62	27	-0.023	205	–	–
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⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	83⁽¹⁾	–	–
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	–	–	–
Spina et al.	2021	0.46	–	–	27	0.009⁽²⁰⁾	–	–	–
Cantat-Gaudin et al.	2020	0.43	0.53	–	27	–	–	–	–
Zhong et al.	2020	0.00	0.00	–	0	0.000	–	–	–
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	–	–	–	–

(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 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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