NGC 6840

(MWSC 3205)

0.21 UTI

0.0

C_N

0.04

C_dens

0.12

C_C3

0.44

C_lit

1.0

C_dup

C3 classification DC

Number of members (P>50%) 21

Radius (P>50% members) 6.6 [arcmin]

C_N 0.0 Sparse
C_dens 0.04 Very loose
C_C3 0.12 Very low quality
C_lit 0.44 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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NGC 6840 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a large^* distance, well below the mid-plane, affected by low extinction. It is catalogued as an old cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~5.13 kpc) differs significantly from the median photometric distance (~2.35 kpc).

Relatively close Low extinction Old

Data

🔍 Search references for NGC 6840 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	–	298.808	12.138	0.195	-4.778	-5.782	–
Just et al.	2023	298.824	12.128	–	–	–	–
Bica et al.	2019	298.816	12.118	–	–	–	–
Loktin & Popova	2017	298.815	12.128	–	-1.332	-5.93	–
Kharchenko et al.	2016	298.824	12.128	–	–	–	–
Dias et al.	2014	298.825	12.127	–	-0.65	1.01	–
Kharchenko et al.	2013	298.83	12.13	–	-3.98	-4.25	–
Dias et al.	2002	298.825	12.127	–	-0.65	1.01	–

💡 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]	Bfr	BSS
Just et al.	2023	–	–	–	2512	–	824	–	–
Loktin & Popova	2017	2.24	0.24	–	6310	–	–	–	–
Kharchenko et al.	2016	2.45	0.52	–	2512	–	–	–	–
Kharchenko et al.	2013	2.45	0.52	–	2512	–	–	–	–
Dias et al.	2002	1.97	0.78	–	1288	–	–	–	–

Visualization

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