Haffner 9

(MWSC 1214; OCL 600; FSR 1240; FoF 197)

0.85 UTI

0.8

C_N

1.0

C_dens

0.75

C_C3

0.84

C_lit

1.0

C_dup

N_m (P>50%) 229

Core radius and density 1.1 [pc], 13 [pc^-2]

C3 classification AB

C_N 0.8 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.84 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 9 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate distance, near 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 age and mass parameters (see Parameters). It is well-studied in the literature.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as optical pair (not dynamically associated) P121, along with UBC_220.

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 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=0.2205, e_all=0.0503.

Data

🔍 Search references for Haffner 9 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–	111.177	-16.995	0.312	-0.86	0.446	–
Almeida et al.	2025	111.174	-17.001	–	–	–	–
Hunt & Reffert	2024	111.18	-16.997	0.308	-0.861	0.438	52.851
Cavallo et al.	2024	111.18	-16.997	0.309	–	–	–
Hunt & Reffert	2023	111.18	-16.997	0.308	-0.861	0.438	52.851
Almeida et al.	2023	111.171	-17.004	–	–	–	–
Just et al.	2023	111.169	-16.998	–	–	–	–
Jadhav & Subramaniam	2021	111.175	-17.001	–	–	–	–
Dias et al.	2021	111.174	-17.001	0.337	-0.844	0.423	–
Cantat-Gaudin et al.	2020	111.175	-17.001	0.337	-0.832	0.424	–
Sánchez et al.	2020	111.175	-17.003	–	-0.828	0.545	–
Cantat-Gaudin & Anders	2020	111.175	-17.001	0.337	-0.832	0.424	–
Liu & Pang	2019	111.173	-16.993	0.344	-0.836	0.483	–
Bossini et al.	2019	111.175	-17.001	–	–	–	–
Bica et al.	2019	111.179	-16.994	–	–	–	–
Cantat-Gaudin et al.	2018	111.175	-17.001	0.337	-0.832	0.424	–
Dias et al.	2018	–	–	–	-2.35	0.18	–
Dib et al.	2018	111.175	-17.0	–	–	–	–
Loktin & Popova	2017	111.18	-17.0	–	-2.319	4.716	–
Sampedro et al.	2017	111.175	-17.003	–	1.85	1.56	–
Joshi et al.	2016	111.175	-17.0	–	–	–	–
Kharchenko et al.	2016	111.169	-16.998	–	–	–	–
Dias et al.	2014	111.175	-17.003	–	1.36	2.09	–
Kharchenko et al.	2013	111.175	-17.0	–	-2.08	5.68	–
Bukowiecki et al.	2011	111.175	-16.995	–	–	–	–
Dias et al.	2002	111.175	-17.003	–	1.36	2.09	–
Lynga	1987	111.137	-17.004	–	–	–	–

💡 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–	2.68	1.915	2.01	141	0.000	680	0.64	0
Almeida et al.	2025	2.60	2.23	–	96	–	511	–	–
Hunt & Reffert	2024	2.93	2.17	2.01	205	–	1671⁽¹⁾	–	–
Cavallo et al.	2024	2.68	2.31	–	288	0.030	–	–	–
Hunt & Reffert	2023	2.93	2.17	2.01	205	–	–	–	–
Almeida et al.	2023	2.65	2.21	–	93	-0.145	582⁽¹⁾	0.64	–
Just et al.	2023	–	–	–	141	–	45	–	–
Jadhav & Subramaniam	2021	2.91	1.38	–	380	–	1141	–	0⁽¹⁾
Dias et al.	2021	2.60	2.23	–	96	-0.172	–	–	–
Cantat-Gaudin et al.	2020	2.91	1.38	–	380	–	–	–	–
Kounkel et al.	2020	2.84	2.09	–	324	–	–	–	–
Cantat-Gaudin & Anders	2020	2.74	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	363	0.250	–	–	–
Bossini et al.	2019	2.96	1.61	–	445	0.000	–	–	–
Cantat-Gaudin et al.	2018	2.74	–	–	–	–	–	–	–
Dib et al.	2018	1.80	–	–	141	–	–	–	–
Loktin & Popova	2017	3.70	1.57	–	646	–	–	–	–
Joshi et al.	2016	1.80	1.74	–	141	–	–	–	–
Kharchenko et al.	2016	1.80	1.74	–	141	–	–	–	–
Kharchenko et al.	2013	1.80	1.74	–	141	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	779	–	–
Bukowiecki et al.	2011	2.19⁽¹⁾	2.24	–	112	–	–	–	–
Dias et al.	2002	1.90	1.70	–	141	–	–	–	–

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

Visualization

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