Haffner 6

(MWSC 1177; OCL 582)

0.94 UTI

0.86

C_N

0.89

C_dens

1.0

C_C3

0.97

C_lit

1.0

C_dup

N_m (P>50%) 386

Core radius and density 2.2 [pc], 4.5 [pc^-2]

C3 classification AA

C_N 0.86 Rich
C_dens 0.89 Dense
C_C3 1.0 Very high quality
C_lit 0.97 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 6 is a rich, 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 metallicity and mass parameters (see Parameters). It is very well-studied in the literature.

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

Distant Moderate extinction Massive 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: 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=0.0862, e_all=0.1291.

Data

🔍 Search references for Haffner 6 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–	109.991	-13.153	0.2	-1.261	2.004	71.116
Otto et al.	2026	109.991	-13.152	–	-1.22	1.96	70.0
Li et al.	2025	109.998	-13.151	0.204	-1.22	1.96	–
Hu & Soubiran	2025	109.986	-13.152	–	–	–	–
Almeida et al.	2025	109.998	-13.153	–	–	–	–
Hunt & Reffert	2024	109.991	-13.152	0.206	-1.253	2.0	84.394
Cavallo et al.	2024	109.986	-13.152	0.204	–	–	–
Hunt & Reffert	2023	109.991	-13.152	0.206	-1.253	2.0	84.394
Almeida et al.	2023	109.998	-13.152	–	–	–	–
Just et al.	2023	110.009	-13.148	–	–	–	–
Jadhav & Subramaniam	2021	109.998	-13.151	–	–	–	–
Jaehnig et al.	2021	109.997	-13.152	0.223	-1.223	1.949	–
Rain et al.	2021	109.998	-13.151	0.204	-1.22	1.96	–
Dias et al.	2021	109.998	-13.153	0.212	-1.226	1.964	69.56
Cantat-Gaudin et al.	2020	109.998	-13.151	0.204	-1.22	1.96	–
Cantat-Gaudin & Anders	2020	109.998	-13.151	0.204	-1.22	1.96	–
Bossini et al.	2019	109.998	-13.151	–	–	–	–
Soubiran et al.	2018	109.998	-13.151	–	–	–	70.03
Bica et al.	2019	109.999	-13.146	–	–	–	–
Cantat-Gaudin et al.	2018	109.998	-13.151	0.204	-1.22	1.96	–
Dias et al.	2018	–	–	–	-2.4	2.04	–
Loktin & Popova	2017	110.025	-13.15	–	-0.749	3.885	–
Sampedro et al.	2017	110.025	-13.133	–	-0.04	4.39	–
Kharchenko et al.	2016	110.009	-13.148	–	–	–	–
Dias et al.	2014	110.025	-13.133	–	-0.55	3.58	–
Kharchenko et al.	2013	110.014	-13.15	–	0.36	4.16	–
Bukowiecki et al.	2011	110.004	-13.154	–	–	–	–
Ahumada & Lapasset	2007	110.025	-13.133	–	–	–	–
van den Bergh	2006	109.988	-13.161	–	–	–	–
Dias et al.	2002	110.025	-13.133	–	-0.55	3.58	–
Lynga	1987	110.013	-13.128	–	–	–	–

💡 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–	4.11	1.63	1.56	644	-0.219	1909	0.63	1
Otto et al.	2026	–	–	–	617	-0.250⁽¹⁵⁾	–	–	–
Li et al.	2025	4.67	1.74	–	656	0.052	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.280⁽⁵⁾	–	–	–
Almeida et al.	2025	3.86	1.94	–	684	–	1696	–	–
Hunt & Reffert	2024	4.42	1.63	1.56	439	–	2806⁽¹⁾	–	–
Cavallo et al.	2024	3.27	2.14	–	603	-0.510	–	–	–
Hunt & Reffert	2023	4.42	1.63	1.56	439	–	–	–	–
Almeida et al.	2023	4.11	2.08	–	430	-0.219	1745⁽¹⁾	0.63	–
Just et al.	2023	–	–	–	733	–	733	–	–
Jadhav & Subramaniam	2021	4.47	1.36	–	617	–	2073	–	0⁽¹⁾
Jaehnig et al.	2021	4.43⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	4.29	1.42	–	661	–	–	–	1
Dias et al.	2021	3.86	1.94	–	684	-0.183	–	–	–
Cantat-Gaudin et al.	2020	4.47	1.36	–	617	–	–	–	–
Kounkel et al.	2020	3.87	1.64	–	501	–	–	–	–
Cantat-Gaudin & Anders	2020	4.29	–	–	–	–	–	–	–
Bossini et al.	2019	4.29	1.46	–	542	0.000	–	–	–
Soubiran et al.	2018	4.29	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	4.29	–	–	–	–	–	–	–
Loktin & Popova	2017	2.21	2.66	–	81	–	–	–	–
Kharchenko et al.	2016	3.32	1.91	–	733	–	–	–	–
Kharchenko et al.	2013	3.32	1.91	–	733	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	3047	–	–
Bukowiecki et al.	2011	3.78⁽¹⁾	1.58	–	631	–	–	–	–
Ahumada & Lapasset	2007	–	1.42	–	676	–	–	–	2
van den Bergh	2006	3.05	1.42	–	676	–	–	–	–
Dias et al.	2002	3.05	1.42	–	670	–	–	–	–
Lynga	1987	1.10	0.00	–	794	–	–	–	–

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

Visualization

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