Vel OB2

0.05 UTI

0.0

C_N

0.01

C_dens

0.25

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 10

Stellar density (N₅₀/rad) 0.1 [N/pc²]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.01 Very loose
C_C3 0.25 Low quality
C_lit 0.0 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Vel OB2 is a sparse, very loose object of low C3 quality. Its parallax locates it at a large^* distance, well below the mid-plane, affected by low extinction. It is catalogued as a massive, very young cluster (see Parameters). It is rarely studied in the literature, with no articles listed in the last 18 years.

(*): The parallax distance estimate (~6.58 kpc) differs significantly from the median photometric distance (~0.41 kpc).

⚠️ 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.

Very close Low extinction Massive Very young

Data

🔍 Search references for Vel OB2 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–	122.401	-47.905	0.152	-1.923	2.451	–
Piskunov et al.	2008	122.374	-47.899	–	–	–	–
Piskunov et al.	2007	122.374	-47.899	–	–	–	–
Kharchenko et al.	2005	122.38	-47.9	–	-6.1	8.85	15.45

💡 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–	0.41	0.09	–	18	–	1329	–	–
Piskunov et al.	2008	0.41	0.09	–	18	–	1718⁽¹⁾	–	–
Piskunov et al.	2007	0.41	0.09	–	18	–	940	–	–
Kharchenko et al.	2005	0.41	0.09	–	18	–	–	–	–

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

Visualization

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