HSC 991

0.36 UTI

0.31

C_N

0.24

C_dens

0.75

C_C3

0.25

C_lit

1.0

C_dup

C3 classification AB

Number of members (P>50%) 31

Radius (P>50% members) 3.1 [arcmin]

C_N 0.31 Poorly populated
C_dens 0.24 Very loose
C_C3 0.75 High quality
C_lit 0.25 Poorly studied
C_dup 1.0 Unique

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

Overview

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HSC 991 is a poorly populated, very loose object of high C3 quality. Its parallax locates it at a large^* distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It was recently reported in the literature.

(*): The parallax distance estimate (~5.62 kpc) differs significantly from the median photometric distance (~4.18 kpc).

Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.

Distant Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for HSC 991 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	–	15.659	59.795	0.178	-1.504	-0.418	–
Zhang et al.	2024	15.656	59.798	–	–	–	–
Hunt & Reffert	2024	15.656	59.798	0.178	-1.5	-0.412	-81.867
Cavallo et al.	2024	15.68	59.782	0.186	–	–	–
Hunt & Reffert	2023	15.656	59.798	0.178	-1.5	-0.412	-81.867

💡 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
Zhang et al.	2024	–	–	–	–	0.046*	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	324*	–	–
Cavallo et al.	2024	3.78	1.80	–	162	-0.550	–	–	–
Hunt & Reffert	2023	4.58	1.43	0.84	161	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 3543	87.1	15.69	59.79	0.18	-1.51	-0.42	-81.86	0.04

💡 Note: The % column shows the percentage of members that HSC 991 shares with each listed object.

Visualization

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