RSG4

(TRSG 4; UBC 1; OCSN 278)

0.49 UTI

0.4

C_N

0.26

C_dens

0.75

C_C3

0.52

C_lit

1.0

C_dup

N_m (P>50%) 40

Core radius and density 2.1 [pc], 1.3 [pc^-2]

C3 classification BA

C_N 0.4 Poorly populated
C_dens 0.26 Loose
C_C3 0.75 High quality
C_lit 0.52 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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RSG4 is a poorly populated, loose object of 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, young cluster (see Parameters). It is moderately studied in the literature.

Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.

Very close Low extinction Near-solar metallicity Young

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.

Palma et al. (2025)
Classified as optical pair P522, along with HSC_727.

Cavallo et al. (2024)
Gold sample.

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

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.4536, e_all=0.4997.

Data

🔍 Search references for RSG4 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–	287.748	56.787	3.081	-2.509	3.641	-23.078
Yan et al.	2026	287.696	56.523	3.086	-2.489	3.734	–
Li et al.	2025	287.87	56.801	3.049	-2.579	3.649	–
Yang et al.	2025	287.696	56.523	–	–	–	–
Alfonso et al.	2024	288.032	56.887	3.049	-2.479	3.717	–
Zhang et al.	2024	287.696	56.523	–	–	–	–
Hunt & Reffert	2024	287.696	56.523	3.086	-2.489	3.734	-24.333
Cavallo et al.	2024	288.053	56.753	3.08	–	–	–
Hunt & Reffert	2023	287.696	56.523	3.086	-2.489	3.734	-24.333
Qin et al.	2023	287.84	56.86	3.06	-2.5	3.6	-23.18
He et al.	2022	287.959	56.89	3.084	-2.471	3.728	–
Tarricq et al.	2022	287.68	56.955	3.089	-2.471	3.628	–
Spina et al.	2021	287.885	56.801	3.049	-2.495	3.723	–
Cantat-Gaudin et al.	2020	287.87	56.801	3.049	-2.579	3.649	–
Cantat-Gaudin & Anders	2020	287.87	56.801	3.049	-2.579	3.649	–
Bica et al.	2019	287.824	56.624	–	–	–	–
Castro-Ginard et al.	2018	287.998	56.833	3.051	-2.493	3.694	-21.46
Roser et al.	2016	288.54	56.97	–	-0.27	5.71	–

💡 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–	0.32	0.22	0.41	89	0.024	108	–	–
Yan et al.	2026	–	–	–	111	–	–	–	–
Li et al.	2025	0.31	0.02	–	102	0.049	–	–	–
Yang et al.	2025	–	–	–	112	-0.010⁽³⁾	–	–	–
Alfonso et al.	2024	0.33	0.35	–	89	0.009	–	–	–
Zhang et al.	2024	–	–	–	–	0.155⁽¹⁾	–	–	–
Hunt & Reffert	2024	0.32	0.06	0.41	112	–	108⁽¹⁾	–	–
Cavallo et al.	2024	0.33	0.39	–	87	0.260	–	–	–
Hunt & Reffert	2023	0.32	0.06	0.41	112	–	–	–	–
Qin et al.	2023	0.32	0.13	–	89	–	–	–	–
He et al.	2022	–	0.35	–	79	–	–	–	–
Spina et al.	2022	–	–	–	–	0.024	–	–	–
Tarricq et al.	2022	0.32	–	–	71	–	–	–	–
Spina et al.	2021	0.33	–	–	69	0.020⁽²⁰⁾	–	–	–
Cantat-Gaudin et al.	2020	0.33	0.35	–	69	–	–	–	–
Cantat-Gaudin & Anders	2020	0.32	–	–	–	–	–	–	–
Roser et al.	2016	0.36	0.22	–	355	–	–	–	–

(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 14676	100.0	287.77	56.73	3.08	-2.5	3.63	-23.34	0.08

💡 Note: The % column shows the percentage of members that RSG4 shares with each listed object.

Visualization

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