HSC 2874

0.25 UTI

0.29

C_N

0.25

C_dens

0.5

C_C3

0.25

C_lit

0.83

C_dup

N₅₀ (P>50% members) 29

Stellar density (N₅₀/rad) 1.2 [N/pc²]

C3 classification BB

C_N 0.29 Poorly populated
C_dens 0.25 Loose
C_C3 0.5 Intermediate quality
C_lit 0.25 Poorly studied
C_dup 0.83 Very likely unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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HSC 2874 is a poorly populated, loose object of intermediate 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, very young cluster, but with a large variance across recent sources for the distance parameter (see Parameters). It was recently reported in the literature.

Note: This is very likely a unique object, which shares a small percentage of members with at least one previously reported entry. See table with shared members information.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=0.83) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Relatively close High extinction Massive Near-solar metallicity Very young

Liu et al. (2025)
Classified as primordial binary cluster 249 along with HSC_2870.

Palma et al. (2025)
Part of multiple system G168, along with OC_0680 and HSC_2870.

Cavallo et al. (2024)
Silver sample.

Data

🔍 Search references for HSC 2874 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–	259.085	-39.339	0.392	-0.472	-1.423	-43.017
Hunt & Reffert	2024	259.106	-39.314	0.394	-0.469	-1.45	40.246
Cavallo et al.	2024	259.087	-39.305	0.393	–	–	–
Hunt & Reffert	2023	259.106	-39.314	0.394	-0.469	-1.45	40.246

💡 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–	2.75	4.23	2.04	11	0.300	1257	–	–
Liu et al.	2025	8.91	1.40	–	13	–	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	1257⁽¹⁾	–	–
Cavallo et al.	2024	2.75	4.23	–	11	0.300	–	–	–
Hunt & Reffert	2023	2.41	4.43	2.04	11	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UBC 559	17.2	259.15	-39.65	0.39	-0.47	-1.42	-26.57	0.53

💡 Note: The % column shows the percentage of members that HSC 2874 shares with each listed object.

Visualization

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