Haffner 8

(OCL 578; MWSC 1200; FoF 376)

0.87 UTI

0.84

C_N

1.0

C_dens

0.75

C_C3

0.87

C_lit

1.0

C_dup

N_m (P>50%) 342

Core radius and density 2.0 [pc], 8.0 [pc^-2]

C3 classification AB

C_N 0.84 Rich
C_dens 1.0 Very dense
C_C3 0.75 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 8 is a rich, very dense object of 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 absorption and metallicity parameters (see Parameters). It is well-studied in the literature.

Relatively close Low extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as optical pair P120, along with OC_0382.

Almeida et al. (2025)
Mass determination: good fit. Isochrone match: good 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=0.1584, e_all=0.1043.

Data

🔍 Search references for Haffner 8 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–	110.771	-12.307	0.326	-1.611	0.474	58.585
Li et al.	2025	110.777	-12.31	0.314	-1.626	0.446	–
Almeida et al.	2025	110.784	-12.315	–	–	–	–
Hunt & Reffert	2024	110.772	-12.303	0.335	-1.62	0.475	57.369
Cavallo et al.	2024	110.772	-12.309	0.333	–	–	–
Hunt & Reffert	2023	110.772	-12.303	0.335	-1.62	0.475	57.369
Almeida et al.	2023	110.776	-12.319	–	–	–	–
Jaehnig et al.	2021	110.768	-12.309	0.352	-1.608	0.425	–
Rain et al.	2021	110.777	-12.31	0.314	-1.626	0.446	–
Dias et al.	2021	110.784	-12.315	0.311	-1.634	0.448	61.879
Cantat-Gaudin et al.	2020	110.777	-12.31	0.314	-1.626	0.446	–
Cantat-Gaudin & Anders	2020	110.777	-12.31	0.314	-1.626	0.446	–
Liu & Pang	2019	110.771	-12.322	0.317	-1.598	0.456	–
Soubiran et al.	2018	110.777	-12.31	–	–	–	61.49
Bica et al.	2019	110.765	-12.294	–	–	–	–
Cantat-Gaudin et al.	2018	110.777	-12.31	0.314	-1.626	0.446	–
Dias et al.	2018	–	–	–	-2.34	0.97	–
Dib et al.	2018	110.793	-12.308	–	–	–	–
Sampedro et al.	2017	110.85	-12.333	–	-3.68	-0.58	–
Joshi et al.	2016	110.793	-12.308	–	–	–	–
Dias et al.	2014	110.85	-12.333	–	-3.6	-0.73	–
Gozha et al.	2012	110.85	-12.333	–	–	–	–
Bukowiecki et al.	2011	110.763	-12.303	–	–	–	–
Ahumada & Lapasset	2007	110.85	-12.333	–	–	–	–
van den Bergh	2006	110.85	-12.333	–	–	–	–
Dias et al.	2002	110.85	-12.333	–	-3.6	-0.73	–
Lynga	1987	110.84	-12.324	–	–	–	–

💡 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–	2.62	0.91	0.71	340	0.040	732	0.52	0
Li et al.	2025	2.87	1.17	–	288	0.138	–	–	–
Almeida et al.	2025	2.51	1.29	–	286	–	553	–	–
Hunt & Reffert	2024	2.62	0.91	0.71	341	–	830⁽¹⁾	–	–
Cavallo et al.	2024	3.03	1.30	–	302	0.540	–	–	–
Hunt & Reffert	2023	2.62	0.91	0.71	340	–	–	–	–
Almeida et al.	2023	2.50	1.29	–	340	-0.116	633⁽¹⁾	0.52	–
Jaehnig et al.	2021	2.84⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	2.91	0.09	–	316	–	–	–	0
Dias et al.	2021	2.51	1.29	–	286	-0.078	–	–	–
Cantat-Gaudin et al.	2020	3.01	1.16	–	240	–	–	–	–
Kounkel et al.	2020	2.93	1.37	–	339	–	–	–	–
Cantat-Gaudin & Anders	2020	2.91	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	63	0.500	–	–	–
Soubiran et al.	2018	2.91	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.91	–	–	–	–	–	–	–
Dib et al.	2018	1.20	–	–	1084	–	–	–	–
Joshi et al.	2016	1.20	0.09	–	1084	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	1145	–	–
Gozha et al.	2012	1.18	–	–	1413	0.020	–	–	–
Bukowiecki et al.	2011	3.24⁽¹⁾	0.47	–	794	–	–	–	–
Paunzen et al.	2010	–	–	–	–	0.020	–	–	–
Ahumada & Lapasset	2007	–	0.09	–	1413	–	–	–	0
van den Bergh	2006	1.18	0.09	–	1413	–	–	–	–
Dias et al.	2002	2.38	0.10	–	316	0.060	–	–	–
Lynga	1987	1.70	0.00	–	501	–	–	–	–

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

Visualization

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