HSC 2899

0.21 UTI

0.45

C_N

0.05

C_dens

0.5

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 45

Core radius and density 5.7 [pc], 0.3 [pc^-2]

C3 classification BB

C_N 0.45 Poorly populated
C_dens 0.05 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.03 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 2899 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, above 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.

⚠️ 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 High extinction Massive Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.10 (50th percentile), false positive (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.10 (50th percentile), false positive (human-assigned).

Data

🔍 Search references for HSC 2899 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–	258.6	-35.922	0.319	-0.94	-2.205	-23.814
Hunt & Reffert	2024	258.556	-35.898	0.336	-0.961	-2.208	-39.894
Cavallo et al.	2024	258.558	-35.945	0.341	–	–	–
Hunt & Reffert	2023	258.556	-35.898	0.336	-0.961	-2.208	-39.894

💡 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–	2.53	4.97	3.0	982	-0.250	4111	–	–
Hunt & Reffert	2024	2.53	4.97	3.00	982	–	4111⁽¹⁾	–	–
Cavallo et al.	2024	3.65	4.76	–	603	-0.250	–	–	–
Hunt & Reffert	2023	2.53	4.97	3.00	982	–	–	–	–

(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 3976	77.8	258.75	-35.98	0.28	-0.94	-2.21	-3.49	0.22

💡 Note: The % column shows the percentage of members that HSC 2899 shares with each listed object.

Visualization

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