Ruprecht 3

0.05 UTI

0.0

C_N

0.02

C_dens

0.25

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 19

Stellar density (N₅₀/rad) 0.1 [N/pc²]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.02 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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Ruprecht 3 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 low-mass, old cluster (see Parameters). It is rarely studied in the literature, with no articles listed in the last 7 years.

(*): The parallax distance estimate (~6.63 kpc) differs significantly from the median photometric distance (~1.56 kpc).

Note: This object shares a very small 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 Low extinction Low mass Old

Cantat-Gaudin & Anders (2020)
Appears as a tight group of bright stars, but Gaia DR1 and DR2 parallaxes and proper motions show it is an asterism. More details in Appendix A of the article.

Data

🔍 Search references for Ruprecht 3 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–	100.479	-29.466	0.151	-0.874	1.535	–
Angelo et al.	2019	100.533	-29.452	–	–	–	–
Bukowiecki et al.	2011	100.529	-29.452	–	–	–	–

💡 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–	1.56	0.0	–	1449	–	24	–	–
Angelo et al.	2019	2.29	–	–	1120	–	24	–	–
Bukowiecki et al.	2011	0.83⁽¹⁾	0.00	–	1778	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Ruprecht 2	4.0	100.3	-29.51	0.12	-0.47	1.79	69.32	0.17

💡 Note: The % column shows the percentage of members that Ruprecht 3 shares with each listed object.

Visualization

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