Stephenson 1

(MWSC 3018; Del L; delta Lyr; OCL 137; FoF 2433; OCSN 263)

Click to load Aladin Lite
0.98 UTI
0.88
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 438
Radius (P>50% members) 37.2 [arcmin]
  • CN 0.88 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high 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¸
Stephenson 1 is a rich, very dense object of very high C3 quality. Its parallax locates it at a very close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the absorption and metallicity parameters (see Parameters). It is very well-studied in the literature.
Very close Low extinction Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Stephenson 1 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 283.548 36.827 2.79 1.129 -3.007 -19.121
Li et al. 2025 283.568 36.899 2.779 1.11 -3.01 –
Wei et al. 2025 283.557 36.801 2.786 1.124 -2.97 –
Almeida et al. 2025 283.523 36.932 – – – –
Alfonso et al. 2024 283.549 36.826 2.75 1.106 -2.948 –
Zhang et al. 2024 283.578 36.881 – – – –
Hunt & Reffert 2024 283.578 36.881 2.798 1.121 -3.018 -20.127
Celli et al. 2024 283.568 36.899 – – – –
Cavallo et al. 2024 283.508 36.825 2.795 – – –
Hunt & Reffert 2023 283.578 36.881 2.798 1.121 -3.018 -20.127
Almeida et al. 2023 283.556 36.907 – – – –
Qin et al. 2023 283.6 36.87 2.8 1.15 -3.07 -18.46
Just et al. 2023 283.51 36.803 – – – –
He et al. 2022 283.387 35.762 2.78 1.15 -3.014 –
Dias et al. 2021 283.523 36.932 2.776 1.16 -2.998 -18.895
Cantat-Gaudin et al. 2020 283.568 36.899 2.779 1.11 -3.01 –
Cantat-Gaudin & Anders 2020 283.568 36.899 2.779 1.11 -3.01 –
Liu & Pang 2019 283.536 36.901 2.783 1.19 -2.975 –
Bossini et al. 2019 283.568 36.899 – – – –
Soubiran et al. 2018 283.568 36.899 – – – -18.69
Bica et al. 2019 283.601 36.87 – – – –
Cantat-Gaudin et al. 2018 283.568 36.899 2.779 1.11 -3.01 –
Loktin & Popova 2017 283.38 36.917 – 1.4 -2.46 -27.5
Kharchenko et al. 2016 283.51 36.803 – – – –
Dias et al. 2014 283.375 36.917 – 1.4 -2.46 –
Kharchenko et al. 2013 283.515 36.805 – 1.95 -3.48 -27.5
Gozha et al. 2012 283.375 36.917 – – – –
Piskunov et al. 2008 283.495 36.822 – – – –
Kharchenko et al. 2007 283.38 36.92 – 0.87 – -27.47
Piskunov et al. 2007 283.495 36.822 – – – –
van den Bergh 2006 283.5 36.817 – – – –
Kharchenko et al. 2005 283.5 36.82 – 1.66 -2.84 -21.6
Kharchenko et al. 2003 283.51 36.88 – 1.01 -2.89 –
Dias et al. 2002 283.375 36.917 – 1.4 -2.46 -27.47

💡 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
Li et al. 2025 0.37 0.23 – 38 0.151 – – –
Wei et al. 2025 0.35 0.05 – 42 0.500 353 0.42 –
Almeida et al. 2025 0.35 0.23 – 43 – 92 – –
Alfonso et al. 2024 0.34 0.22 – 40 0.055 – – –
Zhang et al. 2024 – – – – 0.158* – – –
Hunt & Reffert 2024 – – – – – 237* – –
Celli et al. 2024 – – – 28 – 90 – –
Cavallo et al. 2024 0.37 0.62 – 17 0.000 – – –
Hunt & Reffert 2023 0.35 0.17 0.64 27 – – – –
Almeida et al. 2023 0.35 0.43 – 62 0.182 204* 0.26 –
Qin et al. 2023 0.33 0.16 – 45 – – – –
Just et al. 2023 – – – 33 – 58 – –
He et al. 2022 – 0.45 – 35 – – – –
Dias et al. 2021 0.35 0.23 – 43 0.055 – – –
Cantat-Gaudin et al. 2020 0.34 0.22 – 28 – – – –
Cantat-Gaudin & Anders 2020 0.36 – – – – – – –
Liu & Pang 2019 – – – 46 0.250 – – –
Bossini et al. 2019 0.35 0.16 – 27 0.000 – – –
Soubiran et al. 2018 0.36 – – – – – – –
Cantat-Gaudin et al. 2018 0.36 – – – – – – –
Loktin & Popova 2017 0.37 0.12 – 54 – – – –
Kharchenko et al. 2016 0.37 0.10 – 33 – – – –
Kharchenko et al. 2013 0.37 0.10 – 33 – – – –
Gozha et al. 2012 0.39 – – 54 – 955 – –
Piskunov et al. 2008 0.37 0.12 – 49 – 589* – –
Piskunov et al. 2007 0.37 0.12 – 49 – 333 – –
van den Bergh 2006 0.39 0.12 – 54 – – – –
Kharchenko et al. 2005 0.37 0.12 – 49 – – – –
Kharchenko et al. 2003 0.39 0.12 – – – – – –
Dias et al. 2002 0.39 0.12 – 54 – – – –

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Visualization
ℹī¸
Stephenson 1 UCC
Stephenson 1 HUNT23
Stephenson 1 CANTAT20
Galactocentric position diagram