Surveys · 4 of 6
ZTFDR24
Ground-based, bands g, r, i. Detections from 2018-03-20 to 2025-10-22.
Footprint
Brightness is stars per cell with a light curve from ZTF (HEALPix order 6, log scale), over the whole archive in gray. Galactic Mollweide, Galactic center in the middle, east left, 30° graticule. It shows where the archive holds light curves, not the survey's full footprint.
Time system
- native column
- hmjd
- time scale
- UTC
- reference frame
- heliocentric
- origin
- MJD (JD − 2400000.5)
- reference position
- source
- archive time axis
- BJD_TDB (bjd_tdb)
Converted to BJD_TDB by removing the heliocentric correction and applying the barycentric one. The native hmjd is also served.
Bands
| band | λ_eff | saturation | collection | stars with a light curve | epochs | detections | era |
|---|---|---|---|---|---|---|---|
| ZTF gztf:g | 483 nm | 12.5 mag | curves_live | 4,561,787 | 2,395,589,404 | 2,098,811,380 | 2018-03-25 → 2025-10-22 |
| ZTF rztf:r | 646 nm | 12.5 mag | curves_live | 4,669,734 | 4,278,285,975 | 3,587,418,696 | 2018-03-20 → 2025-10-22 |
| ZTF iztf:i | 790 nm | 12.5 mag | curves_live | 2,738,221 | 348,664,648 | 228,987,088 | 2018-04-06 → 2025-09-26 |
Joint fit: g + r share one multiband periodogram; i is fitted alone.
Epoch selection
- good epochs
- catflags = 0
- detections
- every good epoch (no limiting magnitude is published)
- non-detections
- not reported
Alias frequencies
|f ± k·f_sid| (k=1,2), |f ± 1/365.25|, window at 365.25 / 182.63 / 29.53 d
Crossmatch to VSX
Fixed radius (not measured).
One radius was used for the whole scan; each link stores it as link_radius_arcsec.
- ID column
- objectid
- catalog epoch
- J2021
ZTF object IDs change between data releases, and each names one filter, field and CCD quadrant rather than a star.
Caveats
- A star in overlapping fields has an object ID in each; the archive groups them into one star.
- Statistics and periodograms remove zero-point offsets per field and CCD quadrant (fieldid, rcid).
- 1,555 DR24 epochs have photometry but no time; they are set aside and not served.
Bulk access
Light curves are in the nested lc_ztf column of curves_live.
# read the release directly over HTTPS
import json, lsdb
from upath import UPath
root = UPath("https://data.varchive.app")
ptr = json.loads((root / "catalogs/latest.json").read_text())
RA, DEC = 0.0, 0.0 # your field center, degrees
# curves_live: ZTF g, r, i
live = lsdb.read_hats(root / ptr["collections"]["curves_live"]["path"],
columns=["varchive_id", "ra", "dec", "lc_ztf"])
df = live.cone_search(RA, DEC, 600).compute() # radius in arcsec
lc = df["lc_ztf"].iloc[0] # band, bjd_tdb, mag, mag_err, detected, hmjd, catflags, fieldid, rcid
g = lc[lc["band"] == "g"] # one band at a time
# never concatenate across bands or surveys; bjd_tdb is the time axis for scienceMore in the data guide.
Citation
- Bellm et al. 2019, PASP 131, 018002 The Zwicky Transient Facility: System Overview, Performance, and First Results
- Masci et al. 2019, PASP 131, 018003 The Zwicky Transient Facility: Data Processing, Products, and Archive
- Chen et al. 2020, ApJS 249, 18 The Zwicky Transient Facility Catalog of Periodic Variable Stars
Based on observations obtained with the Samuel Oschin 48-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grant No. AST-1440341 and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, the University of Washington, Deutsches Elektronen-Synchrotron and Humboldt University, Los Alamos National Laboratories, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, and Lawrence Berkeley National Laboratories. Operations are conducted by COO, IPAC, and UW.
Based on observations obtained with the Samuel Oschin Telescope 48-inch and the 60-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grant No. AST-2034437 and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, and IN2P3, France. Operations are conducted by COO, IPAC, and UW.
BibTeX · 3 entries from NASA ADS
@ARTICLE{2019PASP..131a8002B,
author = {{Bellm}, Eric C. and {Kulkarni}, Shrinivas R. and {Graham}, Matthew J. and {Dekany}, Richard and {Smith}, Roger M. and {Riddle}, Reed and {Masci}, Frank J. and {Helou}, George and {Prince}, Thomas A. and {Adams}, Scott M. and {Barbarino}, C. and {Barlow}, Tom and {Bauer}, James and {Beck}, Ron and {Belicki}, Justin and {Biswas}, Rahul and {Blagorodnova}, Nadejda and {Bodewits}, Dennis and {Bolin}, Bryce and {Brinnel}, Valery and {Brooke}, Tim and {Bue}, Brian and {Bulla}, Mattia and {Burruss}, Rick and {Cenko}, S. Bradley and {Chang}, Chan-Kao and {Connolly}, Andrew and {Coughlin}, Michael and {Cromer}, John and {Cunningham}, Virginia and {De}, Kishalay and {Delacroix}, Alex and {Desai}, Vandana and {Duev}, Dmitry A. and {Eadie}, Gwendolyn and {Farnham}, Tony L. and {Feeney}, Michael and {Feindt}, Ulrich and {Flynn}, David and {Franckowiak}, Anna and {Frederick}, S. and {Fremling}, C. and {Gal-Yam}, Avishay and {Gezari}, Suvi and {Giomi}, Matteo and {Goldstein}, Daniel A. and {Golkhou}, V. Zach and {Goobar}, Ariel and {Groom}, Steven and {Hacopians}, Eugean and {Hale}, David and {Henning}, John and {Ho}, Anna Y.~Q. and {Hover}, David and {Howell}, Justin and {Hung}, Tiara and {Huppenkothen}, Daniela and {Imel}, David and {Ip}, Wing-Huen and {Ivezi{\'c}}, {\v{Z}}eljko and {Jackson}, Edward and {Jones}, Lynne and {Juric}, Mario and {Kasliwal}, Mansi M. and {Kaspi}, S. and {Kaye}, Stephen and {Kelley}, Michael S.~P. and {Kowalski}, Marek and {Kramer}, Emily and {Kupfer}, Thomas and {Landry}, Walter and {Laher}, Russ R. and {Lee}, Chien-De and {Lin}, Hsing Wen and {Lin}, Zhong-Yi and {Lunnan}, Ragnhild and {Giomi}, Matteo and {Mahabal}, Ashish and {Mao}, Peter and {Miller}, Adam A. and {Monkewitz}, Serge and {Murphy}, Patrick and {Ngeow}, Chow-Choong and {Nordin}, Jakob and {Nugent}, Peter and {Ofek}, Eran and {Patterson}, Maria T. and {Penprase}, Bryan and {Porter}, Michael and {Rauch}, Ludwig and {Rebbapragada}, Umaa and {Reiley}, Dan and {Rigault}, Mickael and {Rodriguez}, Hector and {van Roestel}, Jan and {Rusholme}, Ben and {van Santen}, Jakob and {Schulze}, S. and {Shupe}, David L. and {Singer}, Leo P. and {Soumagnac}, Maayane T. and {Stein}, Robert and {Surace}, Jason and {Sollerman}, Jesper and {Szkody}, Paula and {Taddia}, F. and {Terek}, Scott and {Van Sistine}, Angela and {van Velzen}, Sjoert and {Vestrand}, W. Thomas and {Walters}, Richard and {Ward}, Charlotte and {Ye}, Quan-Zhi and {Yu}, Po-Chieh and {Yan}, Lin and {Zolkower}, Jeffry},
title = "{The Zwicky Transient Facility: System Overview, Performance, and First Results}",
journal = {\pasp},
keywords = {Astrophysics - Instrumentation and Methods for Astrophysics},
year = 2019,
month = jan,
volume = {131},
number = {995},
pages = {018002},
doi = {10.1088/1538-3873/aaecbe},
archivePrefix = {arXiv},
eprint = {1902.01932},
primaryClass = {astro-ph.IM},
adsurl = {https://ui.adsabs.harvard.edu/abs/2019PASP..131a8002B},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
@ARTICLE{2019PASP..131a8003M,
author = {{Masci}, Frank J. and {Laher}, Russ R. and {Rusholme}, Ben and {Shupe}, David L. and {Groom}, Steven and {Surace}, Jason and {Jackson}, Edward and {Monkewitz}, Serge and {Beck}, Ron and {Flynn}, David and {Terek}, Scott and {Landry}, Walter and {Hacopians}, Eugean and {Desai}, Vandana and {Howell}, Justin and {Brooke}, Tim and {Imel}, David and {Wachter}, Stefanie and {Ye}, Quan-Zhi and {Lin}, Hsing-Wen and {Cenko}, S. Bradley and {Cunningham}, Virginia and {Rebbapragada}, Umaa and {Bue}, Brian and {Miller}, Adam A. and {Mahabal}, Ashish and {Bellm}, Eric C. and {Patterson}, Maria T. and {Juri{\'c}}, Mario and {Golkhou}, V. Zach and {Ofek}, Eran O. and {Walters}, Richard and {Graham}, Matthew and {Kasliwal}, Mansi M. and {Dekany}, Richard G. and {Kupfer}, Thomas and {Burdge}, Kevin and {Cannella}, Christopher B. and {Barlow}, Tom and {Van Sistine}, Angela and {Giomi}, Matteo and {Fremling}, Christoffer and {Blagorodnova}, Nadejda and {Levitan}, David and {Riddle}, Reed and {Smith}, Roger M. and {Helou}, George and {Prince}, Thomas A. and {Kulkarni}, Shrinivas R.},
title = "{The Zwicky Transient Facility: Data Processing, Products, and Archive}",
journal = {\pasp},
keywords = {Astrophysics - Instrumentation and Methods for Astrophysics},
year = 2019,
month = jan,
volume = {131},
number = {995},
pages = {018003},
doi = {10.1088/1538-3873/aae8ac},
archivePrefix = {arXiv},
eprint = {1902.01872},
primaryClass = {astro-ph.IM},
adsurl = {https://ui.adsabs.harvard.edu/abs/2019PASP..131a8003M},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
@ARTICLE{2020ApJS..249...18C,
author = {{Chen}, Xiaodian and {Wang}, Shu and {Deng}, Licai and {de Grijs}, Richard and {Yang}, Ming and {Tian}, Hao},
title = "{The Zwicky Transient Facility Catalog of Periodic Variable Stars}",
journal = {\apjs},
keywords = {Periodic variable stars, Pulsating variable stars, Cepheid variable stars, RR Lyrae variable stars, Delta Scuti variable stars, Long period variable stars, Mira variable stars, Eclipsing binary stars, Galaxy structure, Distance indicators, 1213, 1307, 218, 1410, 370, 935, 1066, 444, 622, 394, Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Astrophysics of Galaxies},
year = 2020,
month = jul,
volume = {249},
number = {1},
eid = {18},
pages = {18},
doi = {10.3847/1538-4365/ab9cae},
archivePrefix = {arXiv},
eprint = {2005.08662},
primaryClass = {astro-ph.SR},
adsurl = {https://ui.adsabs.harvard.edu/abs/2020ApJS..249...18C},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}Also cite AAVSO VSX and Gaia.
- license
- public (IRSA/IPAC open data)
- data
- https://irsa.ipac.caltech.edu/Missions/ztf.html
- release
- DR24