HSC 1999

0.56 UTI

0.52

C_N

1.0

C_dens

0.75

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 55

Stellar density (N₅₀/rad) 6.2 [N/pc²]

C3 classification AB

C_N 0.52 Moderately populated
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.25 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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HSC 1999 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It was recently reported in the literature.

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

Distant High extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for HSC 1999 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–	116.762	-33.207	0.253	-3.23	3.044	56.396
Hu & Soubiran	2025	116.782	-33.216	–	–	–	–
Hunt & Reffert	2024	116.755	-33.198	0.25	-3.196	3.048	53.897
Cavallo et al.	2024	116.782	-33.216	0.252	–	–	–
Hunt & Reffert	2023	116.755	-33.198	0.25	-3.196	3.048	53.897

💡 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–	3.47	4.745	1.96	622	-0.325	892	–	–
Hu & Soubiran	2025	–	–	–	–	-0.290⁽⁵⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	892⁽¹⁾	–	–
Cavallo et al.	2024	3.61	4.55	–	851	-0.360	–	–	–
Hunt & Reffert	2023	3.33	4.94	1.96	394	–	–	–	–

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 2978	100.0	116.76	-33.21	0.26	-3.22	3.05	56.69	0.16

💡 Note: The % column shows the percentage of members that HSC 1999 shares with each listed object.

Visualization

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