Sco OB5

0.55 UTI

0.5

C_N

1.0

C_dens

0.75

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 51

Stellar density (N₅₀/rad) 7.0 [N/pc²]

C3 classification AB

C_N 0.5 Moderately populated
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.25 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Sco OB5 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a relatively close^* distance, below the mid-plane, affected by low extinction. It is catalogued as an extremely massive, very young cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~1.22 kpc) differs significantly from the median photometric distance (~3.31 kpc).

Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.

Distant Low extinction Extremely massive Very young

Data

🔍 Search references for Sco OB5 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–	268.109	-38.704	0.817	2.902	-1.812	-14.824
He et al.	2023	268.137	-38.728	0.804	2.884	-1.796	-17.98
Piskunov et al.	2008	268.129	-38.644	–	–	–	–
Piskunov et al.	2007	268.129	-38.644	–	–	–	–
Kharchenko et al.	2005	268.14	-38.64	–	2.46	-1.8	–

💡 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–	3.31	0.71	–	7	–	349626	–	–
He et al.	2023	1.29	1.00	–	16	–	–	–	–
Piskunov et al.	2008	3.31	0.71	–	7	–	588844⁽¹⁾	–	–
Piskunov et al.	2007	3.31	0.71	–	7	–	110408	–	–
Kharchenko et al.	2005	3.31	0.71	–	7	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Alessi 80B	98.0	268.11	-38.69	0.81	2.9	-1.77	-17.98	0.21

💡 Note: The % column shows the percentage of members that Sco OB5 shares with each listed object.

Visualization

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