Waterloo 7

(MWSC 1220)

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0.73 UTI
0.51
CN
0.86
Cdens
0.75
CC3
0.77
Clit
1.0
Cdup
Nm (P>50%) 52
Core radius and density 1.1 [pc], 4.3 [pc-2]
C3 classification AB
  • CN 0.51 Moderately populated
  • Cdens 0.86 Dense
  • CC3 0.75 High quality
  • Clit 0.77 Well-studied
  • Cdup 1.0 Unique
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 MOCAMOCA πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
Waterloo 7 is a moderately populated, dense object of high C3 quality. Its parallax locates it at a moderate distance, above 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 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.

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=0.4101, e_all=0.3035.

Rain et al. (2021)
This cluster was include in (Dias et al., 2002A&A...389..871D, Cat. B/ocl) however, parameters log(t)=7.76, Av=0.418, Z=0.025were taken from Monteiro & Dias (2019MNRAS.487.2385M).

Bica et al. (2019)
Web updates in DAML02, some were later removed (2003 to 2010).

Data
πŸ” Search references for Waterloo 7 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 111.537 -15.093 0.275 -1.529 1.724 62.438
Li et al. 2025 111.532 -15.09 0.27 -1.514 1.695 –
Almeida et al. 2025 111.532 -15.088 – – – –
Hunt & Reffert 2024 111.537 -15.092 0.264 -1.521 1.728 59.398
Cavallo et al. 2024 111.547 -15.089 0.263 – – –
Hunt & Reffert 2023 111.537 -15.092 0.264 -1.521 1.728 59.398
Just et al. 2023 111.526 -15.091 – – – –
Rain et al. 2021 111.532 -15.09 0.27 -1.514 1.695 –
Dias et al. 2021 111.532 -15.088 0.267 -1.521 1.681 –
Cantat-Gaudin et al. 2020 111.532 -15.09 0.27 -1.514 1.695 –
SΓ‘nchez et al. 2020 111.533 -15.093 – -1.875 1.684 –
Cantat-Gaudin & Anders 2020 111.532 -15.09 0.27 -1.514 1.695 –
Monteiro & Dias 2019 111.533 -15.093 – -1.484 1.697 2.58
Bossini et al. 2019 111.532 -15.09 – – – –
Soubiran et al. 2018 111.532 -15.09 – – – 65.91
Bica et al. 2019 111.541 -15.09 – – – –
Cantat-Gaudin et al. 2018 111.532 -15.09 0.27 -1.514 1.695 –
Loktin & Popova 2017 111.54 -15.091 – -2.705 0.737 83.0
Sampedro et al. 2017 111.533 -15.093 – 0.46 2.28 –
Kharchenko et al. 2016 111.526 -15.091 – – – –
Dias et al. 2014 111.533 -15.093 – 0.28 1.27 –
Kharchenko et al. 2013 111.532 -15.093 – -1.79 2.63 83.0
Bukowiecki et al. 2011 111.529 -15.097 – – – –
van den Bergh 2006 111.533 -15.093 – – – –
Dias et al. 2002 111.533 -15.093 – -1.79 2.63 –

πŸ’‘ 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– 3.265 1.29 0.95 73 0.025 368 – 1
Li et al. 2025 3.12 1.26 – 79 0.033 – – –
Almeida et al. 2025 2.84 1.41 – 67 – 201 – –
Hunt & Reffert 2024 3.20 1.10 0.95 192 – 503(1) – –
Cavallo et al. 2024 3.33 1.50 – 20 0.210 – – –
Hunt & Reffert 2023 3.20 1.10 0.95 192 – – – –
Just et al. 2023 – – – 339 – 2366 – –
Rain et al. 2021 3.35 1.29 – 58 – – – 1
Dias et al. 2021 2.84 1.41 – 67 -0.107 – – –
Cantat-Gaudin et al. 2020 3.56 1.48 – 30 – – – –
Kounkel et al. 2020 3.43 1.16 – 182 – – – –
Cantat-Gaudin & Anders 2020 3.35 – – – – – – –
Monteiro & Dias 2019 3.73 1.32 – 58 0.025 – – –
Bossini et al. 2019 3.68 1.32 – 45 0.000 – – –
Soubiran et al. 2018 3.35 – – – – – – –
Cantat-Gaudin et al. 2018 3.35 – – – – – – –
Loktin & Popova 2017 4.23 0.58 – 93 – – – –
Kharchenko et al. 2016 2.93 1.12 – 339 – – – –
Kharchenko et al. 2013 2.93 1.12 – 339 – – – –
Bukowiecki et al. 2012 – – – – – 232 – –
Bukowiecki et al. 2011 1.98(1) 0.82 – 28 – – – –
van den Bergh 2006 2.80 1.32 – – – – – –
Dias et al. 2002 2.80 1.32 – – – – – –

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

Visualization
ℹ️
Waterloo 7 UCC
Waterloo 7 HUNT23
Waterloo 7 CANTAT20
Galactocentric position diagram