Hogg 20

(MWSC 2451; OCL 976; ESO 277 09)

0.25 UTI

0.0

C_N

0.01

C_dens

0.62

C_C3

0.31

C_lit

1.0

C_dup

C3 classification AC

Number of members (P>50%) 10

Radius (P>50% members) 9.6 [arcmin]

C_N 0.0 Sparse
C_dens 0.01 Very loose
C_C3 0.62 Intermediate quality
C_lit 0.31 Poorly studied
C_dup 1.0 Unique

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

Overview

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Hogg 20 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a large^* distance, below the mid-plane, affected by moderate extinction. It is catalogued as a young cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~5.81 kpc) differs significantly from the median photometric distance (~1.78 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 Moderate extinction Young

Data

🔍 Search references for Hogg 20 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	–	251.11	-47.587	0.172	-4.265	-4.434	-114.917
Just et al.	2023	251.127	-47.655	–	–	–	–
Bica et al.	2019	251.173	-47.582	–	–	–	–
Kharchenko et al.	2016	251.127	-47.655	–	–	–	–
Dias et al.	2014	251.125	-47.633	–	-2.02	-4.07	–
Kharchenko et al.	2013	251.137	-47.655	–	-3.2	-5.33	–

💡 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	–	–	–	28	–	159	–	–
Kharchenko et al.	2016	1.78	1.94	–	28	–	–	–	–
Kharchenko et al.	2013	1.78	1.94	–	28	–	–	–	–

Visualization

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