NGC 1891

0.12 UTI

0.25

C_N

0.08

C_dens

0.25

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 25

Stellar density (N₅₀/rad) 0.4 [N/pc²]

C3 classification CC

C_N 0.25 Poorly populated
C_dens 0.08 Very loose
C_C3 0.25 Low quality
C_lit 0.0 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 1891 is a poorly populated, 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 an old cluster (see Parameters). It is rarely studied in the literature, with no articles listed in the last 12 years.

(*): The parallax distance estimate (~3.86 kpc) differs significantly from the median photometric distance (~860.00 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.

Extremely distant Low extinction Old

Dias et al. (2002)
Asterism (Carraro, G. et al. 2004, astro-ph/0412019); cat V3.5 (Jan 2016)

Data

🔍 Search references for NGC 1891 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–	80.371	-35.757	0.259	-0.789	1.947	63.674
Tadross	2014	80.354	-35.74	–	–	–	–

💡 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–	860.0	0.09	–	2000	–	–	–	–
Tadross	2014	860.00	0.09	–	2000	–	–	–	–

Visualization

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