Hogg 4

(MWSC 1734; OCL 793; ESO 167 13; FSR 1515)

0.94 UTI

1.0

C_N

1.0

C_dens

1.0

C_C3

0.86

C_lit

1.0

C_dup

C3 classification AA

Number of members (P>50%) 639

Radius (P>50% members) 5.2 [arcmin]

C_N 1.0 Very rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.86 Well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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Hogg 4 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and mass parameters (see Parameters). It is well-studied in the literature.

Distant Moderate extinction Massive Near-solar metallicity Intermediate age

Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: intermediate fit. Silver sample.

Cavallo et al. (2024)
Gold sample.

Dias et al. (2002)
No cluster (Piatti, A. E.; Clariá, J. J.; Ahumada, A. V. 2011, NewA 16, 161)

Data

🔍 Search references for Hogg 4 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	–	149.415	-54.616	0.238	-5.034	4.476	26.492
Li et al.	2025	149.424	-54.612	0.21	-5.022	4.484	–
Hu & Soubiran	2025	149.404	-54.61	–	–	–	–
Almeida et al.	2025	149.423	-54.608	–	–	–	–
Hunt & Reffert	2024	149.427	-54.632	0.243	-5.035	4.472	23.941
Cavallo et al.	2024	149.404	-54.61	0.241	–	–	–
Hunt & Reffert	2023	149.427	-54.632	0.243	-5.035	4.472	23.941
Almeida et al.	2023	149.414	-54.61	–	–	–	–
Just et al.	2023	149.462	-54.622	–	–	–	–
Dias et al.	2021	149.423	-54.608	0.205	-5.016	4.503	26.578
Cantat-Gaudin et al.	2020	149.424	-54.612	0.21	-5.022	4.484	–
Cantat-Gaudin & Anders	2020	149.424	-54.612	0.21	-5.022	4.484	–
Soubiran et al.	2018	149.424	-54.612	–	–	–	26.57
Bica et al.	2019	149.435	-54.622	–	–	–	–
Cantat-Gaudin et al.	2018	149.424	-54.612	0.21	-5.022	4.484	–
Kharchenko et al.	2016	149.462	-54.622	–	–	–	–
Kharchenko et al.	2013	149.467	-54.625	–	-1.9	1.5	–

💡 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	3.60	1.83	–	1076	0.045	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.150*	–	–	–
Almeida et al.	2025	3.71	1.93	–	982	–	1943	–	–
Hunt & Reffert	2024	–	–	–	–	–	5453*	–	–
Cavallo et al.	2024	3.01	1.82	–	1230	0.110	–	–	–
Hunt & Reffert	2023	3.72	1.84	1.70	822	–	–	–	–
Almeida et al.	2023	3.48	1.92	–	998	-0.046	2165*	0.73	–
Just et al.	2023	–	–	–	200	–	70	–	–
Dias et al.	2021	3.71	1.93	–	982	-0.044	–	–	–
Cantat-Gaudin et al.	2020	4.02	1.04	–	1479	–	–	–	–
Cantat-Gaudin & Anders	2020	4.18	–	–	–	–	–	–	–
Soubiran et al.	2018	4.18	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	4.18	–	–	–	–	–	–	–
Kharchenko et al.	2016	1.77	1.03	–	200	–	–	–	–
Kharchenko et al.	2013	1.77	1.03	–	200	–	–	–	–

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

Visualization

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