NGC 1807

(MWSC 479)

0.14 UTI

0.0

C_N

0.07

C_dens

0.38

C_C3

0.13

C_lit

1.0

C_dup

N_m (P>50%) 24

Core radius and density 3.8 [pc], 0.3 [pc^-2]

C3 classification BC

C_N 0.0 Sparse
C_dens 0.07 Very loose
C_C3 0.38 Low quality
C_lit 0.13 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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NGC 1807 is a sparse, very loose object of low C3 quality. Its parallax locates it at a relatively close^* distance, below the mid-plane, affected by moderate extinction. It is catalogued as an intermediate-age cluster (see Parameters). It is rarely studied in the literature.

(*): The parallax distance estimate (~1.85 kpc) differs significantly from the median photometric distance (~2.81 kpc).

Note: This object shares a large percentage of members with at least one entry reported in the same catalogue. See table with shared members information.

⚠️ 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 Moderate extinction Intermediate age

Bica et al. (2019)
Web updates in DAML02, some were later removed (2003 to 2010).

Dias et al. (2002)
Asterism (Balaguer-Núñez et al. 2004, A&A 426, 827; 819); cat V3.5 (Jan 2016)

Data

🔍 Search references for NGC 1807 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–	77.785	16.553	0.54	0.447	-0.942	65.358
Just et al.	2023	77.695	16.522	–	–	–	–
Kharchenko et al.	2016	77.695	16.522	–	–	–	–
Tadross	2014	77.679	16.522	–	–	–	–
Kharchenko et al.	2013	77.703	16.522	–	0.75	-1.35	–
Lynga	1987	77.67	16.525	–	–	–	–
Sulentic et al.	1973	77.661	16.53	–	–	–	–

💡 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–	2.81	1.755	–	178	–	649	–	–
Just et al.	2023	–	–	–	178	–	649	–	–
Kharchenko et al.	2016	2.81	2.50	–	178	–	–	–	–
Tadross	2014	0.96	1.01	–	1000	–	–	–	–
Kharchenko et al.	2013	2.81	2.50	–	178	–	–	–	–
Lynga	1987	–	0.60	–	–	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
NGC 1817	76.0	78.14	16.7	0.57	0.43	-0.93	65.74	1.0

💡 Note: The % column shows the percentage of members that NGC 1807 shares with each listed object.

Visualization

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