Ruprecht 55

(MWSC 1451; OCL 713; ESO 430 25)

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0.58 UTI
0.52
CN
0.13
Cdens
0.25
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 54
Radius (P>50% members) 5.1 [arcmin]
C3 classification CC
  • CN 0.52 Moderately populated
  • Cdens 0.13 Very loose
  • CC3 0.25 Low quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
Ruprecht 55 is a moderately populated, very loose object of low C3 quality. Its parallax locates it at a large distance, above the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, very young cluster (see Parameters). It is very well-studied in the literature.
Distant Moderate extinction Massive Near-solar metallicity Very young

Almeida et al. (2025)
Mass determination: good fit. Isochrone match: intermediate fit.

Data
🔍 Search references for Ruprecht 55 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– 123.113 -32.573 0.165 -2.345 2.913 53.509
Almeida et al. 2025 123.113 -32.581 – – – –
He et al. 2023 123.049 -32.499 0.145 -2.42 3.223 102.2
Just et al. 2023 123.137 -32.602 – – – –
Jaehnig et al. 2021 123.072 -32.576 0.144 -2.429 3.165 –
Dias et al. 2021 123.113 -32.581 0.187 -2.316 2.921 64.253
Bica et al. 2019 123.078 -32.565 – – – –
Loktin & Popova 2017 123.12 -32.582 – -5.777 3.16 95.3
Kharchenko et al. 2016 123.137 -32.602 – – – –
Dias et al. 2014 123.112 -32.583 – -2.37 0.83 –
Kharchenko et al. 2013 123.142 -32.605 – -2.43 2.52 95.3
Gozha et al. 2012 123.112 -32.583 – – – –
Piskunov et al. 2008 123.118 -32.579 – – – –
Kharchenko et al. 2007 123.12 -32.58 – 0.2 – 95.33
Piskunov et al. 2007 123.118 -32.579 – – – –
van den Bergh 2006 123.125 -32.583 – – – –
Kharchenko et al. 2005 123.12 -32.58 – -5.06 1.32 95.33
Kharchenko et al. 2003 123.09 -32.59 – -2.7 4.15 –
Dias et al. 2002 123.112 -32.583 – -2.37 0.83 94.2
Dambis 1999 123.112 -32.583 – – – –

💡 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] Bfrac BSS
UCC 99999– 4.85 1.71 – 9 -0.226 1910 – –
Almeida et al. 2025 4.24 1.64 – 21 – 1067 – –
He et al. 2023 5.01 1.55 – 25 – – – –
Just et al. 2023 – – – 9 – 796 – –
Jaehnig et al. 2021 6.82(1) – – – – – – –
Dias et al. 2021 4.24 1.64 – 21 -0.226 – – –
Loktin & Popova 2017 4.85 1.71 – 8 – – – –
Kharchenko et al. 2016 3.64 1.87 – 9 – – – –
Kharchenko et al. 2013 3.64 1.87 – 9 – – – –
Gozha et al. 2012 4.60 – – 10 – 37154 – –
Piskunov et al. 2008 4.89 1.74 – 9 – 13740(1) – –
Piskunov et al. 2007 4.89 1.74 – 9 – 1910 – –
van den Bergh 2006 4.89 1.74 – 7 – – – –
Kharchenko et al. 2005 4.89 1.74 – 9 – – – –
Kharchenko et al. 2003 4.76 1.46 – – – – – –
Dias et al. 2002 4.60 1.40 – 10 – – – –
Dambis 1999 6.79 1.71 – 8 – – – –

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

Visualization
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Ruprecht 55 UCC
Galactocentric position diagram