NGC 1857

(Melotte 32; Collinder 61; MWSC 505; OCL 428; FSR 0755)

0.96 UTI

0.82

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 290

Stellar density (N₅₀/rad) 18.2 [N/pc²]

C3 classification AA

C_N 0.82 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very 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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NGC 1857 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, above 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 metallicity parameter (see Parameters). It is very well-studied in the literature.

Note: This object shares a very small percentage of members with 2 later reported entries. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 278 along with UBC_432.

Palma et al. (2025)
Classified as optical pair P543, along with UBC_432.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg23' along with Czernik 20.

Data

🔍 Search references for NGC 1857 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–	80.03	39.332	0.336	0.481	-1.375	-0.301
Otto et al.	2026	80.029	39.329	–	0.55	-1.31	0.4
Guerco et al.	2025	80.0	39.7	0.31	0.38	-1.55	1.38
Almeida et al.	2025	80.032	39.337	–	–	–	–
Zhang et al.	2024	80.029	39.329	–	–	–	–
Hunt & Reffert	2024	80.029	39.329	0.331	0.47	-1.384	-3.071
Cavallo et al.	2024	80.028	39.337	0.331	–	–	–
Hunt & Reffert	2023	80.029	39.329	0.331	0.47	-1.384	-3.071
Almeida et al.	2023	80.034	39.334	–	–	–	–
Just et al.	2023	80.005	39.29	–	–	–	–
Dias et al.	2021	80.032	39.337	0.319	0.565	-1.31	0.417
Spina et al.	2021	80.032	39.34	0.314	0.556	-1.32	–
Cantat-Gaudin et al.	2020	80.031	39.336	0.32	0.553	-1.31	–
Donor et al.	2020	80.014	39.29	–	0.75	-1.2	1.3
Zhong et al.	2020	80.031	39.336	–	0.553	-1.31	2.517
Cantat-Gaudin & Anders	2020	80.031	39.336	0.32	0.553	-1.31	–
Soubiran et al.	2018	80.031	39.336	–	–	–	0.49
Bica et al.	2019	80.029	39.34	–	–	–	–
Cantat-Gaudin et al.	2018	80.031	39.336	0.32	0.553	-1.31	–
Loktin & Popova	2017	80.025	39.343	–	-1.065	-0.21	–
Kharchenko et al.	2016	80.005	39.29	–	–	–	–
Tadross	2014	80.05	39.35	–	–	–	–
Dias et al.	2014	80.025	39.343	–	-1.94	-3.84	–
Kharchenko et al.	2013	80.014	39.29	–	-4.73	-0.55	–
Kharchenko et al.	2012	80.014	39.29	–	-4.73	-0.55	–
Bukowiecki et al.	2011	80.013	39.308	–	–	–	–
Dias et al.	2002	80.025	39.343	–	-1.94	-3.84	–
Lynga	1987	80.029	39.34	–	–	–	–
Sulentic et al.	1973	80.008	39.358	–	–	–	–

💡 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–	2.87	1.58	0.42	269	-0.140	883	0.56	–
Otto et al.	2026	–	–	–	251	-0.180⁽¹⁵⁾	–	–	–
Liu et al.	2025	5.42	0.57	–	166	–	–	–	–
Guerco et al.	2025	–	–	–	250	-0.220	–	–	–
Almeida et al.	2025	2.43	1.70	–	269	–	586	–	–
Zhang et al.	2024	–	–	–	–	-0.078⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	1409⁽¹⁾	–	–
Cavallo et al.	2024	2.72	1.51	–	263	0.180	–	–	–
Hunt & Reffert	2023	2.75	1.27	0.42	207	–	–	–	–
Almeida et al.	2023	2.51	1.67	–	273	-0.123	732⁽¹⁾	0.56	–
Just et al.	2023	–	–	–	468	–	883	–	–
Spina et al.	2022	–	–	–	–	-0.140	–	–	–
Dias et al.	2021	2.43	1.70	–	269	-0.199	–	–	–
Spina et al.	2021	3.13	–	–	251	-0.174⁽²⁰⁾	–	–	–
Cantat-Gaudin et al.	2020	2.90	1.38	–	251	–	–	–	–
Kounkel et al.	2020	2.97	1.62	–	288	–	–	–	–
Donor et al.	2020	–	–	–	–	-0.140	–	–	–
Zhong et al.	2020	2.87⁽¹⁾	1.58	–	8670	-0.088	–	–	–
Cantat-Gaudin & Anders	2020	2.87	–	–	–	–	–	–	–
Soubiran et al.	2018	2.87	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.87	–	–	–	–	–	–	–
Loktin & Popova	2017	3.51	0.89	–	575	–	–	–	–
Kharchenko et al.	2016	3.30	1.58	–	468	–	–	–	–
Tadross	2014	1.54	3.06	–	160	–	–	–	–
Kharchenko et al.	2013	3.30	1.58	–	468	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	1457	–	–
Kharchenko et al.	2012	3.30	1.58	–	468	–	–	–	–
Bukowiecki et al.	2011	2.55⁽¹⁾	1.48	–	251	–	–	–	–
Dias et al.	2002	2.49	1.48	–	316	-0.360	–	–	–
Lynga	1987	1.90	1.20	–	–	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Teutsch 88	5.2	80.12	39.54	0.29	0.53	-1.58	31.26	0.08
Czernik 20	2.4	80.12	39.54	0.27	0.56	-1.59	31.08	0.79

💡 Note: The % column shows the percentage of members that NGC 1857 shares with each listed object.

Visualization

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