Auner 1

(MWSC 1087; ESO 558 08)

0.71 UTI

0.75

C_N

0.65

C_dens

1.0

C_C3

0.58

C_lit

1.0

C_dup

N_m (P>50%) 101

Core radius and density 1.6 [pc], 3.3 [pc^-2]

C3 classification AA

C_N 0.75 Rich
C_dens 0.65 Moderately dense
C_C3 1.0 Very high quality
C_lit 0.58 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Auner 1 is a rich, moderately dense object of very high C3 quality. Its parallax locates it at a very large distance, well below the mid-plane, affected by moderate extinction. It is catalogued as a very massive, metal-poor, old cluster, but with a large variance across recent sources for the mass parameter (see Parameters). It is moderately studied in the literature.

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

Very distant Moderate extinction Very massive Metal-poor Old Contains BSS

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.20 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.20 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.2462, e_all=0.2921.

Data

🔍 Search references for Auner 1 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–	106.061	-19.749	0.091	-0.312	0.989	134.816
Hu & Soubiran	2025	106.057	-19.759	–	–	–	–
Hunt & Reffert	2024	106.064	-19.747	0.1	-0.304	0.99	133.439
Cavallo et al.	2024	106.057	-19.759	0.097	–	–	–
Hunt & Reffert	2023	106.064	-19.747	0.1	-0.304	0.99	133.439
Just et al.	2023	106.054	-19.742	–	–	–	–
Jadhav & Subramaniam	2021	106.06	-19.748	–	–	–	–
Cantat-Gaudin et al.	2020	106.06	-19.748	0.093	-0.28	1.015	–
Cantat-Gaudin & Anders	2020	106.06	-19.748	0.093	-0.28	1.015	–
Bica et al.	2019	106.068	-19.742	–	–	–	–
Cantat-Gaudin et al.	2018	106.06	-19.748	0.093	-0.28	1.015	–
Loktin & Popova	2017	106.08	-19.75	–	3.706	3.77	–
Sampedro et al.	2017	106.067	-19.75	–	-3.62	0.39	–
Kharchenko et al.	2016	106.054	-19.742	–	–	–	–
Dias et al.	2014	106.067	-19.75	–	-1.85	0.45	–
Kharchenko et al.	2013	106.06	-19.744	–	0.97	4.01	–
Gozha et al.	2012	106.067	-19.75	–	–	–	–
Bukowiecki et al.	2011	106.062	-19.751	–	–	–	–
Dias et al.	2002	106.067	-19.75	–	-1.85	0.45	–
Lynga	1987	106.068	-19.742	–	–	–	–

💡 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–	8.18	1.25	1.95	2239	-0.500	5117	–	9
Hu & Soubiran	2025	–	–	–	–	-0.380⁽⁵⁾	–	–	–
Hunt & Reffert	2024	7.82	1.61	1.95	1234	–	873⁽¹⁾	–	–
Cavallo et al.	2024	8.36	1.00	–	2455	-0.240	–	–	–
Hunt & Reffert	2023	7.82	1.61	1.95	1233	–	–	–	–
Just et al.	2023	–	–	–	2239	–	5117	–	–
Jadhav & Subramaniam	2021	8.99	0.99	–	3090	–	8081	–	9⁽¹⁾
Cantat-Gaudin et al.	2020	8.99	0.99	–	3090	–	–	–	–
Kounkel et al.	2020	6.46	1.46	–	1148	–	–	–	–
Cantat-Gaudin & Anders	2020	8.18	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	8.18	–	–	–	–	–	–	–
Loktin & Popova	2017	3.40	1.74	–	525	–	–	–	–
Kharchenko et al.	2016	7.15	1.25	–	2239	–	–	–	–
Kharchenko et al.	2013	7.15	1.25	–	2239	-0.500	–	–	–
Gozha et al.	2012	8.90	–	–	3236	-0.500	–	–	–
Bukowiecki et al.	2011	9.14⁽¹⁾	0.82	–	3981	–	–	–	–
Dias et al.	2002	8.90	1.01	–	3236	-0.500	–	–	–

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

Visualization

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