HSC 1099

0.33 UTI

0.55

C_N

0.23

C_dens

0.75

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 60

Core radius and density 2.5 [pc], 1.1 [pc^-2]

C3 classification AB

C_N 0.55 Moderately populated
C_dens 0.23 Very loose
C_C3 0.75 High quality
C_lit 0.06 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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HSC 1099 is a moderately populated, very loose object of high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by high extinction. It is catalogued as a massive, 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 Massive Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Data

🔍 Search references for HSC 1099 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–	37.119	60.148	0.267	-1.243	-0.812	-49.381
Hu & Soubiran	2025	37.123	60.143	–	–	–	–
Hunt & Reffert	2024	37.12	60.137	0.271	-1.253	-0.794	-32.535
Cavallo et al.	2024	37.123	60.143	0.268	–	–	–
Hunt & Reffert	2023	37.12	60.137	0.271	-1.253	-0.794	-32.535

💡 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–	3.24	3.77	1.67	205	0.025	1159	–	–
Hu & Soubiran	2025	–	–	–	–	0.040⁽⁵⁾	–	–	–
Hunt & Reffert	2024	3.24	3.77	1.67	205	–	1159⁽¹⁾	–	–
Cavallo et al.	2024	3.21	3.67	–	537	0.010	–	–	–
Hunt & Reffert	2023	3.24	3.77	1.67	205	–	–	–	–

(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 4038	100.0	37.13	60.15	0.27	-1.25	-0.81	-49.38	0.17

💡 Note: The % column shows the percentage of members that HSC 1099 shares with each listed object.

Visualization

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