Roslund 3

(MWSC 3213; OCL 121; FoF 2069)

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0.91 UTI
0.78
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
Nm (P>50%) 184
Core radius and density 1.2 [pc], 7.8 [pc-2]
C3 classification AB
  • CN 0.78 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
Roslund 3 is a rich, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the age, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

Note: This object contains blue stragglers according to at least one source.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1422, e_all=0.0997.

Rain et al. (2021)
This cluster was include in (Dias et al., 2002A&A...389..871D, Cat. B/ocl) however, parameters log(t)=7.643, Av=1.035, [Fe/H]=0.080 were taken from Bossini et al. (2019A&A...623A.108B, Cat. J/A+A/623/A108). Ahumada & Lapasset (2007A&A...463..789A, Cat. J/A+A/463/789) cite stars DR2 1823376864591083904=HD 350990 and HD 350991 as blue stragglers, HD 350990 is a member according to Cantat-Gaudin et al. (2018A&A...618A..93C, Cat. J/A+A18/A93) however is located in the main sequence of the cluster and not in the straggler region, on the other hand, HD 350991 was not observed by Gaia.

Ahumada & Lapasset (2007)
The dereddened colour-magnitude diagram in (1993A&AS...97..755T) was examined. Adopted cluster centre: star 41 in (1993A&AS...97..755T). Stars A=HD 350990 and B=HD 350991 have spectra B6IIIn and are cluster members (1993A&AS...97..755T). The author assigns the unusual positions of these stars in the colour-magnitude diagram to high rotation velocities.

Data
🔍 Search references for Roslund 3 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 299.699 20.509 0.574 -0.398 -5.158 -9.492
Li et al. 2025 299.695 20.509 0.585 -0.386 -5.108 –
Almeida et al. 2025 299.695 20.51 – – – –
Hunt & Reffert 2024 299.699 20.505 0.572 -0.405 -5.153 -2.928
Cavallo et al. 2024 299.71 20.508 0.572 – – –
Hunt & Reffert 2023 299.699 20.505 0.572 -0.405 -5.153 -2.928
Almeida et al. 2023 299.694 20.511 – – – –
Just et al. 2023 299.656 20.512 – – – –
Jaehnig et al. 2021 299.697 20.507 0.613 -0.387 -5.122 –
Rain et al. 2021 299.695 20.509 0.585 -0.386 -5.108 –
Richer et al. 2021 299.685 20.495 0.582 -0.388 -5.119 –
Dias et al. 2021 299.695 20.51 0.583 -0.376 -5.107 –
Cantat-Gaudin et al. 2020 299.695 20.509 0.585 -0.386 -5.108 –
Cantat-Gaudin & Anders 2020 299.695 20.509 0.585 -0.386 -5.108 –
Liu & Pang 2019 299.7 20.507 0.579 -0.379 -5.088 –
Bossini et al. 2019 299.695 20.509 – – – –
Soubiran et al. 2018 299.695 20.509 – – – -21.67
Bica et al. 2019 299.684 20.501 – – – –
Cantat-Gaudin et al. 2018 299.695 20.509 0.585 -0.386 -5.108 –
Dias et al. 2018 – – – -2.44 -4.75 –
Dib et al. 2018 299.662 20.514 – – – –
Loktin & Popova 2017 299.67 20.514 – -2.385 -8.765 -2.6
Sampedro et al. 2017 299.675 20.483 – 0.6 -4.85 –
Joshi et al. 2016 299.662 20.514 – – – –
Kharchenko et al. 2016 299.656 20.512 – – – –
Dias et al. 2014 299.675 20.483 – -0.98 -4.74 –
Kharchenko et al. 2013 299.662 20.514 – -1.72 -5.35 -2.6
Gozha et al. 2012 299.675 20.483 – – – –
Piskunov et al. 2008 299.668 20.475 – – – –
Kharchenko et al. 2007 299.67 20.48 – 0.2 – –
Piskunov et al. 2007 299.668 20.475 – – – –
Ahumada & Lapasset 2007 299.675 20.483 – – – –
van den Bergh 2006 299.675 20.483 – – – –
Kharchenko et al. 2005 299.67 20.48 – -0.7 -3.98 –
Kharchenko et al. 2003 299.67 20.52 – -1.21 -5.29 –
Chen et al. 2003 299.686 20.465 – -1.61 -5.28 -4.7
Dias et al. 2002 299.675 20.483 – -0.98 -4.74 -4.7
Lynga 1987 299.673 20.484 – – – –

💡 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– 1.58 1.07 1.38 75 0.154 508 0.58 1
Li et al. 2025 1.44 0.86 – 233 0.053 – – –
Almeida et al. 2025 1.58 1.08 – 109 – 399 – –
Hunt & Reffert 2024 1.64 0.97 1.38 75 – 793(1) – –
Cavallo et al. 2024 1.80 1.11 – 56 0.430 – – –
Hunt & Reffert 2023 1.64 0.97 1.38 75 – – – –
Almeida et al. 2023 1.62 1.15 – 105 0.112 496(1) 0.58 –
Just et al. 2023 – – – 50 – 38 – –
Jaehnig et al. 2021 1.63(1) – – – – – – –
Rain et al. 2021 1.63 1.04 – 44 – – – 0
Richer et al. 2021 – 1.05 – – – – – –
Dias et al. 2021 1.58 1.08 – 109 0.197 – – –
Cantat-Gaudin et al. 2020 1.61 0.77 – 54 – – – –
Kounkel et al. 2020 1.72 0.91 – 120 – – – –
Cantat-Gaudin & Anders 2020 1.63 – – – – – – –
Liu & Pang 2019 – – – 363 0.250 – – –
Bossini et al. 2019 1.74 1.03 – 44 0.000 – – –
Soubiran et al. 2018 1.63 – – – – – – –
Cantat-Gaudin et al. 2018 1.63 – – – – – – –
Dib et al. 2018 1.58 – – 50 – – – –
Loktin & Popova 2017 1.52 1.07 – 106 – – – –
Joshi et al. 2016 1.58 1.02 – 50 – 724 – –
Kharchenko et al. 2016 1.58 1.02 – 50 – – – –
Kharchenko et al. 2013 1.58 1.02 – 50 – – – –
Gozha et al. 2012 1.47 – – 109 – 724 – –
Piskunov et al. 2008 1.51 1.07 – 41 – 519(1) – –
Piskunov et al. 2007 1.51 1.07 – 41 – 99 – –
Ahumada & Lapasset 2007 – 1.10 – 110 – – – 2
van den Bergh 2006 1.47 1.10 – 110 – – – –
Kharchenko et al. 2005 1.51 1.07 – 41 – – – –
Kharchenko et al. 2003 1.47 1.10 – – – – – –
Chen et al. 2003 1.47 – – 100 – – – –
Dias et al. 2002 1.47 1.10 – 109 – – – –

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

Visualization
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Roslund 3 UCC
Roslund 3 HUNT23
Roslund 3 CANTAT20
Galactocentric position diagram