Collinder 101

(NGC 2251; MWSC 916; OCL 499)

0.91 UTI

0.78

C_N

1.0

C_dens

0.75

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 171

Stellar density (N₅₀/rad) 13.7 [N/pc²]

C3 classification AB

C_N 0.78 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 1.0 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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Collinder 101 is a rich, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, near 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 metallicity and mass parameters (see Parameters). It is very well-studied in the literature.

Relatively close Low extinction Near-solar metallicity Intermediate age

Almeida et al. (2025)
Mass determination: good fit. Isochrone match: good fit. Silver sample.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Collinder 101 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–	98.673	8.349	0.675	0.67	-3.816	25.601
Li et al.	2025	98.68	8.337	0.658	0.697	-3.806	–
Almeida et al.	2025	98.687	8.357	–	–	–	–
Hunt & Reffert	2024	98.676	8.344	0.678	0.642	-3.795	27.096
Cavallo et al.	2024	98.684	8.366	0.679	–	–	–
Hunt & Reffert	2023	98.676	8.344	0.678	0.642	-3.795	27.096
Just et al.	2023	98.647	8.371	–	–	–	–
Tarricq et al.	2022	98.67	8.349	0.667	0.659	-3.829	–
Jaehnig et al.	2021	98.671	8.352	0.697	0.701	-3.831	–
Rain et al.	2021	98.68	8.337	0.658	0.697	-3.806	–
Dias et al.	2021	98.687	8.357	0.647	0.676	-3.824	26.138
Cantat-Gaudin et al.	2020	98.68	8.337	0.658	0.697	-3.806	–
Cantat-Gaudin & Anders	2020	98.68	8.337	0.658	0.697	-3.806	–
Bossini et al.	2019	98.68	8.337	–	–	–	–
Soubiran et al.	2018	98.68	8.337	–	–	–	26.1
Bica et al.	2019	98.664	8.366	–	–	–	–
Cantat-Gaudin et al.	2018	98.68	8.337	0.658	0.697	-3.806	–
Loktin & Popova	2017	98.655	8.368	–	-0.526	-0.522	-16.0
Kharchenko et al.	2016	98.647	8.371	–	–	–	–
Dias et al.	2014	98.658	8.367	–	-1.13	-0.17	–
Kharchenko et al.	2013	98.655	8.37	–	-1.95	-2.34	-16.0
Gozha et al.	2012	98.658	8.367	–	–	–	–
Piskunov et al.	2008	98.65	8.37	–	–	–	–
Kharchenko et al.	2007	98.65	8.37	–	0.2	–	-16.0
van den Bergh	2006	98.65	8.367	–	–	–	–
Kharchenko et al.	2005	98.65	8.37	–	0.67	-2.79	-16.0
Kharchenko et al.	2003	98.67	8.37	–	-0.24	-2.6	–
Chen et al.	2003	98.655	8.361	–	–	–	–
Dias et al.	2002	98.658	8.367	–	-1.13	-0.17	25.33

💡 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–	1.33	0.59	1.03	275	-0.066	308	–	0.0
Li et al.	2025	1.33	0.78	–	365	-0.052	–	–	–
Almeida et al.	2025	1.31	0.92	–	325	–	365	–	–
Hunt & Reffert	2024	–	–	–	–	–	736⁽¹⁾	–	–
Cavallo et al.	2024	1.43	0.75	–	363	0.260	–	–	–
Hunt & Reffert	2023	1.39	0.58	1.03	491	–	–	–	–
Just et al.	2023	–	–	–	285	–	101	–	–
Tarricq et al.	2022	1.46	–	–	275	–	–	–	–
Jaehnig et al.	2021	1.44⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	1.45	0.56	–	263	–	–	–	0
Dias et al.	2021	1.31	0.92	–	325	-0.092	–	–	–
Cantat-Gaudin et al.	2020	1.52	0.85	–	275	–	–	–	–
Cantat-Gaudin & Anders	2020	1.45	–	–	–	–	–	–	–
Bossini et al.	2019	1.39	0.72	–	308	-0.090	–	–	–
Soubiran et al.	2018	1.45	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	1.45	–	–	–	–	–	–	–
Loktin & Popova	2017	1.34	0.58	–	273	–	–	–	–
Kharchenko et al.	2016	1.33	0.59	–	285	–	–	–	–
Kharchenko et al.	2013	1.33	0.59	–	285	0.250	–	–	–
Gozha et al.	2012	1.33	–	–	267	0.250	251	–	–
Piskunov et al.	2008	1.33	0.59	–	269	–	–	–	–
van den Bergh	2006	1.33	0.59	–	269	–	–	–	–
Kharchenko et al.	2005	1.33	0.59	–	269	–	–	–	–
Kharchenko et al.	2003	1.33	0.59	–	–	–	–	–	–
Chen et al.	2003	1.33	0.58	–	260	-0.080⁽¹⁾	–	–	–
Dias et al.	2002	1.33	0.58	–	267	-0.100	–	–	–

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

Visualization

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