Haffner 26

(MWSC 1459; OCL 707; ESO 430 29; FoF 1438)

0.76 UTI

0.76

C_N

0.32

C_dens

1.0

C_C3

0.87

C_lit

1.0

C_dup

N_m (P>50%) 140

Core radius and density 2.9 [pc], 1.6 [pc^-2]

C3 classification AA

C_N 0.76 Rich
C_dens 0.32 Loose
C_C3 1.0 Very high quality
C_lit 0.87 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 26 is a rich, loose object of very high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by low extinction. It is catalogued as a 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.

Relatively close Low extinction Near-solar metallicity Intermediate age

Almeida et al. (2025)
Mass determination: invalid due to poor quality CMD. Isochrone match: worst fit.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 1.00 (50th percentile), true positive (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 1.00 (50th percentile), true positive (human-assigned).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.3964, e_all=0.153.

Data

🔍 Search references for Haffner 26 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–	123.905	-30.854	0.32	-1.571	2.392	53.711
Li et al.	2025	123.911	-30.851	0.303	-1.588	2.37	–
Hu & Soubiran	2025	123.898	-30.848	–	–	–	–
Almeida et al.	2025	123.906	-30.848	–	–	–	–
Hunt & Reffert	2024	123.898	-30.85	0.323	-1.574	2.387	52.532
Cavallo et al.	2024	123.898	-30.848	0.323	–	–	–
Hunt & Reffert	2023	123.898	-30.85	0.323	-1.574	2.387	52.532
Almeida et al.	2023	123.9	-30.844	–	–	–	–
Cordoni et al.	2023	123.906	-30.848	0.305	-1.584	2.371	–
Just et al.	2023	123.916	-30.826	–	–	–	–
Jadhav & Subramaniam	2021	123.911	-30.851	–	–	–	–
Dias et al.	2021	123.906	-30.848	0.305	-1.584	2.371	55.051
Cantat-Gaudin et al.	2020	123.911	-30.851	0.303	-1.588	2.37	–
Cantat-Gaudin & Anders	2020	123.911	-30.851	0.303	-1.588	2.37	–
Liu & Pang	2019	123.917	-30.857	0.292	-1.748	2.422	–
Bossini et al.	2019	123.911	-30.851	–	–	–	–
Soubiran et al.	2018	123.911	-30.851	–	–	–	55.08
Bica et al.	2019	123.908	-30.861	–	–	–	–
Cantat-Gaudin et al.	2018	123.911	-30.851	0.303	-1.588	2.37	–
Sampedro et al.	2017	123.912	-30.833	–	0.52	-0.3	–
Kharchenko et al.	2016	123.916	-30.826	–	–	–	–
Dias et al.	2014	123.913	-30.833	–	0.42	-0.99	–
Kharchenko et al.	2013	123.922	-30.829	–	-2.89	0.93	62.4
Bukowiecki et al.	2011	123.925	-30.823	–	–	–	–
Piskunov et al.	2008	123.907	-30.825	–	–	–	–
Kharchenko et al.	2005	123.91	-30.83	–	-4.54	4.31	–
Lynga	1987	123.846	-30.836	–	–	–	–

💡 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–	2.63	0.63	0.68	537	-0.061	466	0.6	0
Li et al.	2025	2.63	0.64	–	597	-0.067	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.220⁽⁵⁾	–	–	–
Almeida et al.	2025	2.52	0.76	–	587	–	263	–	–
Hunt & Reffert	2024	2.74	0.22	0.68	673	–	868⁽¹⁾	–	–
Cavallo et al.	2024	2.63	0.63	–	676	-0.020	–	–	–
Hunt & Reffert	2023	2.74	0.23	0.68	673	–	–	–	–
Almeida et al.	2023	2.63	0.62	–	661	-0.055	602⁽¹⁾	0.51	–
Cordoni et al.	2023	2.52	0.76	–	587	-0.121	14564	0.69	0⁽¹⁾
Just et al.	2023	–	–	–	100	–	80	–	–
Jadhav & Subramaniam	2021	2.79	0.46	–	537	–	372	–	0⁽¹⁾
Dias et al.	2021	2.52	0.76	–	587	-0.121	–	–	–
Cantat-Gaudin et al.	2020	2.79	0.46	–	537	–	–	–	–
Kounkel et al.	2020	3.31	0.75	–	295	–	–	–	–
Cantat-Gaudin & Anders	2020	3.01	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	661	0.000	–	–	–
Bossini et al.	2019	2.92	0.57	–	511	0.000	–	–	–
Soubiran et al.	2018	3.01	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	3.01	–	–	–	–	–	–	–
Kharchenko et al.	2016	2.59	1.31	–	100	–	–	–	–
Kharchenko et al.	2013	2.59	1.31	–	100	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	466	–	–
Bukowiecki et al.	2011	2.27⁽¹⁾	1.07	–	16	–	–	–	–
Piskunov et al.	2008	1.00	0.25	–	30	–	–	–	–
Kharchenko et al.	2005	1.00	0.25	–	30	–	–	–	–

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

Visualization

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