Ruprecht 90

0.27 UTI

0.0

C_N

0.17

C_dens

0.5

C_C3

0.35

C_lit

1.0

C_dup

N₅₀ (P>50% members) 18

Stellar density (N₅₀/rad) 0.9 [N/pc²]

C3 classification BB

C_N 0.0 Sparse
C_dens 0.17 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.35 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Ruprecht 90 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, near 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, with no articles listed in the last 12 years.

⚠️ 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.

Distant Low extinction Extremely massive Very young

Data

🔍 Search references for Ruprecht 90 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–	157.943	-58.241	0.351	-7.163	3.262	–
Dias et al.	2014	157.75	-58.45	–	-3.9	1.53	–
Gozha et al.	2012	157.75	-58.45	–	–	–	–
Piskunov et al.	2008	157.952	-58.237	–	–	–	–
Kharchenko et al.	2007	157.75	-58.45	–	0.18	–	-40.0
Kharchenko et al.	2005	157.95	-58.24	–	-6.8	3.47	-40.0
Kharchenko et al.	2003	157.95	-58.24	–	-6.71	2.54	–

💡 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–	3.5	0.99	–	13	–	79433	–	–
Gozha et al.	2012	1.00	–	–	13	–	79433	–	–
Piskunov et al.	2008	6.00	0.99	–	13	–	–	–	–
Kharchenko et al.	2005	6.00	0.99	–	13	–	–	–	–
Kharchenko et al.	2003	1.00	0.62	–	–	–	–	–	–

Visualization

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