Ruprecht 9

(MWSC 1070)

0.23 UTI

0.0

C_N

0.01

C_dens

0.62

C_C3

0.25

C_lit

1.0

C_dup

C3 classification AC

Number of members (P>50%) 11

Radius (P>50% members) 5.4 [arcmin]

C_N 0.0 Sparse
C_dens 0.01 Very loose
C_C3 0.62 Intermediate quality
C_lit 0.25 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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Ruprecht 9 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a large^* distance, well below the mid-plane, affected by moderate extinction. It is catalogued as an intermediate-age cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~8.31 kpc) differs significantly from the median photometric distance (~3.43 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.

Distant Moderate extinction Intermediate age

Data

🔍 Search references for Ruprecht 9 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	–	105.506	-21.944	0.12	-0.333	1.358	91.657
Just et al.	2023	105.524	-21.915	–	–	–	–
Kharchenko et al.	2016	105.524	-21.915	–	–	–	–
Dias et al.	2014	105.529	-21.917	–	-5.76	5.75	–
Kharchenko et al.	2013	105.529	-21.917	–	-1.7	3.96	–

💡 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]	Bfr	BSS
Just et al.	2023	–	–	–	624	–	525	–	–
Kharchenko et al.	2016	3.43	2.13	–	624	–	–	–	–
Kharchenko et al.	2013	3.43	2.13	–	624	–	–	–	–

Visualization

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