OCSN 31

0.00 UTI

0.26

C_N

0.49

C_dens

0.62

C_C3

0.25

C_lit

0.0

C_dup

N₅₀ (P>50% members) 26

Stellar density (N₅₀/rad) 2.4 [N/pc²]

C3 classification CA

C_N 0.26 Poorly populated
C_dens 0.49 Loose
C_C3 0.62 Intermediate quality
C_lit 0.25 Poorly studied
C_dup 0.0 Very likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

ℹ️

OCSN 31 is a poorly populated, loose object of intermediate C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It was recently reported in the literature.

⚠️ Warning: This is very likely a duplicate object, which shares a large percentage of members with at least one previously reported entry. See table with shared members information.

Very close Low extinction Near-solar metallicity Young

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as a moving group.

Data

🔍 Search references for OCSN 31 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	330.055	50.774	3.637	9.54	-0.475	-5.466
Zhang et al.	2024	329.656	50.786	–	–	–	–
Cavallo et al.	2024	330.917	51.335	3.676	–	–	–
Hunt & Reffert	2023	329.656	50.786	3.649	9.603	-0.444	-8.846
Qin et al.	2023	329.53	50.84	3.58	9.68	-0.36	-5.2

💡 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–	0.28	0.28	0.41	37	-0.169	–	–	–
Zhang et al.	2024	–	–	–	–	-0.428⁽¹⁾	–	–	–
Cavallo et al.	2024	0.28	0.43	–	37	0.090	–	–	–
Hunt & Reffert	2023	0.26	0.11	0.41	74	–	–	–	–
Qin et al.	2023	0.30	0.28	–	32	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Theia 136	100.0	330.17	51.09	3.64	9.54	-0.41	-4.86	0.31

💡 Note: The % column shows the percentage of members that OCSN 31 shares with each listed object.

Visualization

ℹ️

1 2