NGC 2180

(MWSC 765)

0.18 UTI

0.0

C_N

0.02

C_dens

0.25

C_C3

0.32

C_lit

1.0

C_dup

N_m (P>50%) 20

Core radius and density 4.3 [pc], 0.1 [pc^-2]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.02 Very loose
C_C3 0.25 Low quality
C_lit 0.32 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

ℹ️

NGC 2180 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate^* distance, well below the mid-plane, affected by low extinction. It is catalogued as a low-mass, old cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~4.95 kpc) differs significantly from the median photometric distance (~1.88 kpc).

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Relatively close Low extinction Low mass Old

Cantat-Gaudin & Anders (2020)
Investigated multiple times as a dissolving cluster, but Gaia DR2 proper motions and parallaxes show no coherent group; confirmed as an asterism. More details in Appendix A of the article.

Data

🔍 Search references for NGC 2180 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	92.454	4.788	0.202	0.156	0.2	48.648
Just et al.	2023	92.43	4.806	–	–	–	–
Bica et al.	2019	92.45	4.806	–	–	–	–
Angelo et al.	2019	92.433	4.823	–	–	–	–
Dias et al.	2018	–	–	–	0.61	-3.01	–
Dib et al.	2018	92.437	4.805	–	–	–	–
Loktin & Popova	2017	92.445	4.807	–	0.039	-0.495	–
Sampedro et al.	2017	92.45	4.807	–	-1.85	-3.93	–
Kharchenko et al.	2016	92.43	4.806	–	–	–	–
Dias et al.	2014	92.45	4.807	–	-1.55	-3.55	–
Kharchenko et al.	2013	92.437	4.805	–	0.6	0.19	–
Piskunov et al.	2008	92.436	4.81	–	–	–	–
Kharchenko et al.	2005	92.44	4.81	–	1.34	-1.83	–

💡 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–	1.88	0.92	–	2002	–	31	–	–
Just et al.	2023	–	–	–	2265	–	35	–	–
Angelo et al.	2019	1.05	–	–	710	–	27	–	–
Dib et al.	2018	1.88	–	–	2265	–	–	–	–
Loktin & Popova	2017	1.96	0.92	–	126	–	–	–	–
Kharchenko et al.	2016	1.88	1.25	–	2265	–	–	–	–
Kharchenko et al.	2013	1.88	1.25	–	2265	–	–	–	–
Piskunov et al.	2008	0.91	0.00	–	1738	–	–	–	–
Kharchenko et al.	2005	0.91	0.00	–	1738	–	–	–	–

Visualization

ℹ️