NGC 7789

(Melotte 245; Collinder 460; MWSC 3779; OCL 269; FSR 0450; FoF 49)

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1.0 UTI
1.0
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 4180
Stellar density (N50/rad) 103.3 [N/pc2]
C3 classification AA
  • CN 1.0 Very 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 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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NGC 7789 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by low extinction. It is catalogued as a very massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the mass parameter (see Parameters). It is very well-studied in the literature.

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

Cavallo et al. (2024)
Gold sample.

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

Rain et al. (2024)
The cluster shows evidence for a double BSS sequence, less pronounced than in Melotte 66. Both sequences are consistent with different binary evolution tracks. Independent studies confirm several BSSs as binaries, but CMD positions of binary and apparently single BSSs overlap without clear separation.

Rain et al. (2021)
The red limit of the straggler area is BP-RP=0.70. There are several stragglers candidates with a radius larger than the apparent radius of the cluster (r=25.0 arcmin (Dias et al., 2002A&A...389..871D, Cat. B/ocl). Apparently, star Gaia DR2 1994778907595519616 is a massive straggler.

Ahumada & Lapasset (2007)
The first selection was based on the photometric study (1958ApJ...128..174B), which is complete (it includes stars up to 7.5' from the cluster centre); the star designations are from (1923VeBon..18....1K). A further selection took into account the detailed membership analysis for each blue straggler (1982ApJ...263..199B), and the proper-motion study (1981A&AS...43..337M). The following membership probabilities are from (1981A&AS...43..337M): star 88, 98%; star 168, 77%; star 192, 52%; star 197, 46%; star 282, 97%; star 316, 98%; star 342, 96%; star 371, 98%; star 409, 53%; star 410, 78%; star 453, 98%; star 651, 98%; star 677, 53%; star 696, 98%; star 746, 98%; star 753, 95%; star 861, 88%; star 1047, 96%; star 1097, 70%; star 1211, 97%. Star 1211 seems to be on the magnitude limit that the mass transfer theory predicts, and star 677 is above that limit (1980PASP...92..514B). An extensive halo of blue stragglers was described in (1980PASP...92..682M), but these stars would belong to the field (1985AJ.....90.1247T): at most, the strag- glers have the same radial distribution that the cluster giants. In the photometric ubvy study of 28 blue stragglers (1985AJ.....90.1247T) there appears to be no peculiar stars among them, except star 1211 (sp. Ap); in general, the objects seem to have evolved from the ZAMS. A spectroscopic study of eight, confirmed stragglers (2001A&A...366..490S) shows deficiency of surface Mg and low projected rotational velocities. Star 753 is a Delta Scuti variable (star V10 in ref. 189). In (1965ZA.....61...97S) this cluster is given E(B-V)=0.31 and age= 1.6 Gyr.

Data
🔍 Search references for NGC 7789 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– 359.313 56.725 0.476 -0.918 -1.952 -54.219
Bijavara Seshashayana et al. 2025 359.264 56.714 – – – –
Otto et al. 2026 359.329 56.724 – -0.92 -1.93 -53.2
Li et al. 2025 -0.666 56.726 0.453 -0.922 -1.933 –
Guerco et al. 2025 359.0 56.8 0.5 -0.94 -2.02 -54.4
Hu & Soubiran 2025 359.329 56.726 – – – –
Carrasco-Varela et al. 2025 359.562 56.792 – – – –
Zhang et al. 2024 359.329 56.724 – – – –
Hunt & Reffert 2024 359.329 56.724 0.479 -0.914 -1.952 -53.867
Cavallo et al. 2024 359.329 56.726 0.479 – – –
Rain et al. 2024 359.335 56.724 0.478 -0.917 -1.957 –
Hunt & Reffert 2023 359.329 56.724 0.479 -0.914 -1.952 -53.867
Angelo et al. 2023 359.387 56.724 – -0.92 -1.95 –
Just et al. 2023 359.347 56.726 – – – –
Jadhav & Subramaniam 2021 -0.666 56.726 – – – –
Jaehnig et al. 2021 359.341 56.727 0.483 -0.925 -1.933 –
Rain et al. 2021 359.334 56.726 0.453 -0.922 -1.933 –
Dias et al. 2021 342.296 56.727 0.449 -0.926 -1.931 -54.059
Spina et al. 2021 359.303 56.725 0.451 -0.926 -1.93 –
Cantat-Gaudin et al. 2020 -0.666 56.726 0.453 -0.922 -1.933 –
Donor et al. 2020 359.355 56.73 – -0.95 -1.91 -54.6
Zhong et al. 2020 -0.666 56.726 – -0.922 -1.933 -59.678
Cantat-Gaudin & Anders 2020 -0.666 56.726 0.453 -0.922 -1.933 –
Liu & Pang 2019 359.329 56.728 0.449 -0.924 -1.93 –
Soubiran et al. 2018 359.334 56.726 – – – -54.15
Bica et al. 2019 359.341 56.723 – – – –
Cantat-Gaudin et al. 2018 -0.666 56.726 0.453 -0.922 -1.933 –
Loktin & Popova 2017 359.355 56.708 – 0.145 -0.881 -54.7
Kharchenko et al. 2016 359.347 56.726 – – – –
Dias et al. 2014 359.35 56.708 – 2.86 -0.74 –
Kharchenko et al. 2013 359.355 56.73 – 0.62 -2.87 -54.7
Gozha et al. 2012 359.35 56.708 – – – –
Kharchenko et al. 2012 359.355 56.73 – 0.62 -2.87 -64.0
Bukowiecki et al. 2011 359.342 56.734 – – – –
Piskunov et al. 2008 359.309 56.709 – – – –
Kharchenko et al. 2007 359.35 56.71 – 0.27 – –
Piskunov et al. 2007 359.309 56.709 – – – –
Ahumada & Lapasset 2007 359.35 56.717 – – – –
van den Bergh 2006 359.35 56.708 – – – –
Kharchenko et al. 2005 359.31 56.71 – 3.03 -0.58 –
Kharchenko et al. 2003 359.28 56.7 – 4.08 0.21 –
Chen et al. 2003 359.252 56.712 – – – –
Dias et al. 2002 359.35 56.708 – 2.86 -0.74 -54.7
Lynga 1987 359.266 56.724 – – – –
Sulentic et al. 1973 359.267 56.722 – – – –

💡 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– 2.07 0.78 0.26 1616 -0.046 8356 0.24 16
Bijavara Seshashayana et al. 2025 – 0.83 – 1550 -0.020(14) – – –
Otto et al. 2026 – – – 1549 0.030(15) – – –
Li et al. 2025 1.95 0.95 – 1709 -0.046 – – –
Guerco et al. 2025 – – – 1550 -0.030 – – –
Hu & Soubiran 2025 – – – – -0.090(5) – – –
Carrasco-Varela et al. 2025 1.91 1.02 – 1614 -0.100 – – 16(1)
Zhang et al. 2024 – – – – -0.085(1) – – –
Hunt & Reffert 2024 – – – – – 17849(1) – –
Cavallo et al. 2024 1.98 1.03 – 1349 0.160 – – –
Rain et al. 2024 1.91 1.08 – 1590 – 22150 0.24 –
Hunt & Reffert 2023 1.96 0.78 0.26 1567 – – – –
Angelo et al. 2023 1.86 0.95 – 1585 0.000 31(1) – –
Just et al. 2023 – – – 1841 – 1854 – –
Spina et al. 2022 – – – – -0.010 – – –
Jadhav & Subramaniam 2021 2.10 0.83 – 1549 – 22265 – 16(1)
Jaehnig et al. 2021 2.06(1) – – – – – – –
Rain et al. 2021 2.07 1.86 – 3311 – – – 16
Dias et al. 2021 1.91 1.02 – 1618 0.026 – – –
Spina et al. 2021 2.23 – – 1549 -0.013(20) – – –
Cantat-Gaudin et al. 2020 2.10 0.83 – 1549 – – – –
Kounkel et al. 2020 2.09 0.95 – 1445 – – – –
Donor et al. 2020 – – – – -0.010 – – –
Zhong et al. 2020 2.07(1) 0.70 – 9265 -0.059 – – –
Cantat-Gaudin & Anders 2020 2.07 – – – – – – –
Liu & Pang 2019 – – – 2290 -0.500 – – –
Soubiran et al. 2018 2.07 – – – – – – –
Cantat-Gaudin et al. 2018 2.07 – – – – – – –
Loktin & Popova 2017 2.40 0.67 – 1671 – – – –
Kharchenko et al. 2016 1.80 0.70 – 1841 – – – –
Kharchenko et al. 2013 1.80 0.70 – 1841 -0.240 – – –
Bukowiecki et al. 2012 – – – – – 10944 – –
Gozha et al. 2012 1.79 – – 1413 -0.240 6166 – –
Kharchenko et al. 2012 1.80 0.70 – 1841 -0.240 – – –
Bukowiecki et al. 2011 1.95(1) 0.66 – 1413 – – – –
Piskunov et al. 2008 2.34 0.69 – 1698 – 8356(1) – –
Piskunov et al. 2007 2.34 0.69 – 1698 – 2056 – –
Ahumada & Lapasset 2007 – 0.69 – 1738 – – – 22
van den Bergh 2006 2.34 0.69 – 1738 – – – –
Kharchenko et al. 2005 2.34 0.69 – 1698 – – – –
Kharchenko et al. 2003 2.34 0.69 – – – – – –
Chen et al. 2003 2.34 0.68 – 1710 -0.080(1) – – –
Dias et al. 2002 1.79 0.88 – 1413 0.020 – – –
Lynga 1987 1.90 0.85 – 1585 -0.100 – – –

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

Visualization
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NGC 7789 UCC
NGC 7789 HUNT23
NGC 7789 CANTAT20
Galactocentric position diagram