NGC 637

(MWSC 133)

0.94 UTI

0.76

C_N

1.0

C_dens

1.0

C_C3

0.97

C_lit

1.0

C_dup

N_m (P>50%) 124

Core radius and density 1.0 [pc], 13 [pc^-2]

C3 classification AA

C_N 0.76 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.97 Very well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

ℹ️

NGC 637 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, very young 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 Moderate extinction Near-solar metallicity Very young

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=0.2118, e_all=0.2186.

Data

🔍 Search references for NGC 637 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	25.782	64.04	0.345	-1.257	-0.024	–
Li et al.	2025	25.775	64.038	0.338	-1.204	0.026	–
Almeida et al.	2025	25.77	64.037	–	–	–	–
Hunt & Reffert	2024	25.771	64.041	0.343	-1.264	-0.037	–
Cavallo et al.	2024	25.76	64.043	0.345	–	–	–
Hunt & Reffert	2023	25.771	64.041	0.343	-1.264	-0.037	–
Almeida et al.	2023	25.774	64.041	–	–	–	–
Just et al.	2023	25.766	64.043	–	–	–	–
Jaehnig et al.	2021	25.775	64.039	0.367	-1.222	0.055	–
Rain et al.	2021	25.775	64.038	0.338	-1.204	0.026	–
Dias et al.	2021	25.77	64.037	0.341	-1.212	0.02	–
Cantat-Gaudin et al.	2020	25.775	64.038	0.338	-1.204	0.026	–
Cantat-Gaudin & Anders	2020	25.775	64.038	0.338	-1.204	0.026	–
Cantat-Gaudin et al.	2018	25.775	64.038	0.338	-1.204	0.026	–
Loktin & Popova	2017	25.77	64.04	–	-0.143	-0.647	-39.1
Sampedro et al.	2017	25.767	64.04	–	–	–	–
Kharchenko et al.	2016	25.766	64.043	–	–	–	–
Dias et al.	2014	25.767	64.04	–	-1.28	0.38	–
Kharchenko et al.	2013	25.777	64.045	–	-0.25	-2.0	-39.1
Gozha et al.	2012	25.767	64.04	–	–	–	–
Kharchenko et al.	2012	25.777	64.045	–	-1.16	-1.7	-39.1
Bukowiecki et al.	2011	25.779	64.036	–	–	–	–
Piskunov et al.	2008	25.753	64.039	–	–	–	–
Kharchenko et al.	2007	25.77	64.04	–	0.1	–	-39.1
Ahumada & Lapasset	2007	25.775	64.033	–	–	–	–
van den Bergh	2006	25.775	64.033	–	–	–	–
Kharchenko et al.	2005	25.77	64.04	–	0.34	-2.2	-39.1
Kharchenko et al.	2003	25.78	64.05	–	1.06	-2.91	–
Dias et al.	2002	25.767	64.04	–	-1.28	0.38	-45.58
Lynga	1987	25.761	64.007	–	–	–	–
Sulentic et al.	1973	25.768	64.009	–	–	–	–

💡 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–	2.5	1.92	1.02	14	0.046	412	0.54	0
Li et al.	2025	2.33	1.95	–	15	-0.134	–	–	–
Almeida et al.	2025	2.52	1.92	–	14	–	394	–	–
Hunt & Reffert	2024	2.63	1.81	1.02	20	–	1259⁽¹⁾	–	–
Cavallo et al.	2024	2.86	1.91	–	18	0.450	–	–	–
Hunt & Reffert	2023	2.63	1.81	1.02	20	–	–	–	–
Almeida et al.	2023	2.32	1.96	–	18	-0.003	430⁽¹⁾	0.54	–
Just et al.	2023	–	–	–	5	–	220	–	–
Jaehnig et al.	2021	2.71⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	2.73	2.02	–	10	–	–	–	0
Dias et al.	2021	2.52	1.92	–	14	0.096	–	–	–
Cantat-Gaudin et al.	2020	2.50	1.67	–	38	–	–	–	–
Kounkel et al.	2020	3.12	1.91	–	8	–	–	–	–
Cantat-Gaudin & Anders	2020	2.73	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.73	–	–	–	–	–	–	–
Loktin & Popova	2017	2.18	1.96	–	10	–	–	–	–
Kharchenko et al.	2016	2.30	1.84	–	5	–	–	–	–
Kharchenko et al.	2013	2.30	1.84	–	5	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	508	–	–
Gozha et al.	2012	2.16	–	–	10	–	85	–	–
Kharchenko et al.	2012	2.50	1.92	–	20	–	–	–	–
Bukowiecki et al.	2011	2.50⁽¹⁾	1.58	–	13	–	–	–	–
Piskunov et al.	2008	2.16	1.92	–	16	–	–	–	–
Ahumada & Lapasset	2007	–	1.99	–	10	–	–	–	0
van den Bergh	2006	2.16	1.99	–	10	–	–	–	–
Kharchenko et al.	2005	2.16	1.92	–	16	–	–	–	–
Kharchenko et al.	2003	2.17	1.89	–	–	–	–	–	–
Dias et al.	2002	2.50	2.02	–	10	–	–	–	–
Lynga	1987	2.10	1.23	–	40	–	–	–	–

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

Visualization

ℹ️

1 2 3