Haffner 4

(MWSC 1094; OCL 583)

0.88 UTI

0.77

C_N

1.0

C_dens

0.75

C_C3

0.94

C_lit

1.0

C_dup

N₅₀ (P>50% members) 143

Stellar density (N₅₀/rad) 29.2 [N/pc²]

C3 classification AB

C_N 0.77 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.94 Very well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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

Note: This object contains blue stragglers according to at least one source.

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

Distant Moderate extinction Near-solar metallicity Intermediate age Contains BSS

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Data

🔍 Search references for Haffner 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	99999–	106.512	-15.006	0.197	-0.411	0.948	57.316
Otto et al.	2026	106.515	-15.005	–	-0.42	0.9	59.7
Li et al.	2025	106.512	-15.002	0.223	-0.417	0.904	–
Hu & Soubiran	2025	106.506	-15.002	–	–	–	–
Almeida et al.	2025	106.51	-15.0	–	–	–	–
Hunt & Reffert	2024	106.515	-15.005	0.201	-0.407	0.96	58.414
Cavallo et al.	2024	106.506	-15.002	0.2	–	–	–
Hunt & Reffert	2023	106.515	-15.005	0.201	-0.407	0.96	58.414
Almeida et al.	2023	106.51	-15.004	–	–	–	–
Just et al.	2023	106.516	-14.993	–	–	–	–
Jadhav & Subramaniam	2021	106.512	-15.002	–	–	–	–
Netopil et al.	2022	106.512	-15.001	0.209	-0.406	0.927	59.25
Dias et al.	2021	106.51	-15.0	0.24	-0.39	0.918	–
Spina et al.	2021	106.513	-15.002	0.225	-0.393	0.902	–
Cantat-Gaudin et al.	2020	106.512	-15.002	0.223	-0.417	0.904	–
Donor et al.	2020	106.522	-14.995	–	-0.48	0.92	59.5
Cantat-Gaudin & Anders	2020	106.512	-15.002	0.223	-0.417	0.904	–
Soubiran et al.	2018	106.512	-15.002	–	–	–	57.05
Bica et al.	2019	106.519	-14.999	–	–	–	–
Cantat-Gaudin et al.	2018	106.512	-15.002	0.223	-0.417	0.904	–
Dias et al.	2018	–	–	–	-1.86	1.42	–
Loktin & Popova	2017	106.53	-14.997	–	3.736	-1.05	–
Sampedro et al.	2017	106.55	-14.983	-0.7	-1.26	–	–
Kharchenko et al.	2016	106.516	-14.993	–	–	–	–
Dias et al.	2014	106.55	-14.983	–	0.25	-0.39	–
Kharchenko et al.	2013	106.522	-14.995	–	4.42	-0.1	–
Gozha et al.	2012	106.55	-14.983	–	–	–	–
Bukowiecki et al.	2011	106.517	-15.003	–	–	–	–
Dias et al.	2002	106.55	-14.983	–	0.25	-0.39	–
Lynga	1987	106.542	-14.976	–	–	–	–

💡 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–	4.165	1.47	1.45	562	-0.164	722	0.8	1
Otto et al.	2026	–	–	–	457	-0.170⁽¹⁵⁾	–	–	–
Li et al.	2025	4.44	1.31	–	743	-0.150	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.360⁽⁵⁾	–	–	–
Almeida et al.	2025	4.02	1.60	–	422	–	405	–	–
Hunt & Reffert	2024	–	–	–	–	–	739⁽¹⁾	–	–
Cavallo et al.	2024	4.06	1.47	–	562	0.240	–	–	–
Hunt & Reffert	2023	4.14	1.13	1.45	509	–	–	–	–
Almeida et al.	2023	4.20	1.49	–	733	-0.237	1119⁽¹⁾	0.80	–
Just et al.	2023	–	–	–	1303	–	451	–	–
Spina et al.	2022	–	–	–	–	-0.160	–	–	–
Jadhav & Subramaniam	2021	5.06	1.05	–	457	–	722	–	1⁽¹⁾
Netopil et al.	2022	3.98⁽¹⁾	1.42	–	447	-0.160⁽¹⁾	–	–	–
Dias et al.	2021	4.02	1.60	–	422	-0.126	–	–	–
Spina et al.	2021	4.06	–	–	457	-0.164⁽²⁰⁾	–	–	–
Cantat-Gaudin et al.	2020	5.06	1.05	–	457	–	–	–	–
Kounkel et al.	2020	4.19	1.63	–	617	–	–	–	–
Donor et al.	2020	–	–	–	–	-0.160	–	–	–
Cantat-Gaudin & Anders	2020	3.98	–	–	–	–	–	–	–
Soubiran et al.	2018	3.98	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	3.98	–	–	–	–	–	–	–
Loktin & Popova	2017	3.21	1.07	–	813	–	–	–	–
Kharchenko et al.	2016	4.46	1.51	–	1303	–	–	–	–
Kharchenko et al.	2013	4.46	1.51	–	1303	-0.380	–	–	–
Gozha et al.	2012	4.45	–	–	1259	-0.380	–	–	–
Bukowiecki et al.	2011	5.93⁽¹⁾	1.23	–	1122	–	–	–	–
Dias et al.	2002	4.50	1.58	–	501	-0.380	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OC 0389	19.6	106.52	-15.0	0.19	-0.41	0.97	57.32	0.0

💡 Note: The % column shows the percentage of members that Haffner 4 shares with each listed object.

Visualization

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