Surveys · 3 of 6

OGLEOCVS

Ground-based, bands I, V, 3 series. Detections from 1997-01-07 to 2026-01-15.

https://ogle.astrouw.edu.pl/ · replaced at the survey's next data release

epochs held

1.39 billion

1.39 billion of them detections

stars with a light curve

683,856

683,856 with ≥ 1 detection

median epochs per star

654

all bands

sky with light curves

10.0%

HEALPix order-6 cells, as mapped

Where its stars are

Footprint

Brightness is stars per cell with a light curve from OGLE (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.

native → BJD_TDB

Time system

native column: hjd
time scale: UTC
reference frame: heliocentric
origin: JD − 2450000
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 hjd is also served.

Bands

band	λ_eff	saturation	collection	stars with a light curve	epochs	detections	era
OGLE-II Iogle:ii:I	789 nm	12 mag	curves_static	60,414	17,630,186	17,630,186	1997-01-07 → 2001-02-20
OGLE-II Vogle:ii:V	551 nm	12 mag	curves_static	58,170	543,400	542,944	1997-01-23 → 2000-06-11
OGLE-III Iogle:iii:I	789 nm	12 mag	curves_static	300,475	171,472,082	171,472,082	2001-06-12 → 2009-05-26
OGLE-III Vogle:iii:V	551 nm	12 mag	curves_static	277,677	1,824,225	1,824,225	2001-07-22 → 2009-05-04
OGLE-IV Iogle:iv:I	789 nm	12 mag	curves_static	669,930	1,165,247,844	1,165,247,844	2010-03-05 → 2026-01-15
OGLE-IV Vogle:iv:V	551 nm	12 mag	curves_static	526,032	33,124,048	33,124,011	2010-03-05 → 2025-09-14

quality rules

Epoch selection

good epochs: every epoch (no quality flag is published)
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

linking

Crossmatch to VSX

Measured radius 1″, 0.27% chance matches.

VSX imported OGLE's positions, so name and position are not independent. The ~1% of counterparts beyond 1.0″ are linked by name.

ID column: ogle_id
catalog epoch: J2015

OGLE IDs are not permanent: the December 2024 revision removed and reclassified some.

Caveats

OGLE-II, -III and -IV are separate series and are processed separately.

LSDB

Bulk access

Light curves are in the nested lc_ogle column of curves_static.

PythonOGLE light curves around a position

# 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_static: OGLE I, V
static = lsdb.read_hats(root / ptr["collections"]["curves_static"]["path"],
                        columns=["varchive_id", "ra", "dec", "lc_ogle"])
df = static.cone_search(RA, DEC, 600).compute()   # radius in arcsec
lc = df["lc_ogle"].iloc[0]   # band, bjd_tdb, mag, mag_err, detected, series, hjd
i = lc[(lc["band"] == "I") & (lc["series"] == "iv")]   # one band, one series

# never concatenate across bands or surveys; bjd_tdb is the time axis for science

Citation

Udalski et al. 2015, AcA 65, 1 OGLE-IV: Fourth Phase of the Optical Gravitational Lensing Experiment

This work uses data from the Optical Gravitational Lensing Experiment (OGLE) Collection of Variable Stars.

BibTeX · 1 entry from NASA ADS

@ARTICLE{2015AcA....65....1U,
       author = {{Udalski}, A. and {Szyma{\'n}ski}, M.~K. and {Szyma{\'n}ski}, G.},
        title = "{OGLE-IV: Fourth Phase of the Optical Gravitational Lensing Experiment}",
      journal = {\actaa},
     keywords = {Surveys, Techniques: Photometric, Galaxy: bulge, Galaxy: disk, Magellanic Clouds, Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics},
         year = 2015,
        month = mar,
       volume = {65},
       number = {1},
        pages = {1-38},
          doi = {10.48550/arXiv.1504.05966},
archivePrefix = {arXiv},
       eprint = {1504.05966},
 primaryClass = {astro-ph.SR},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2015AcA....65....1U},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

Also cite, by subset · 34 subsets, 27 papers; a star's page names its own

blg/cep, blg/t2cep → Soszyński et al. 2017, AcA 67, 297, Udalski et al. 2018, AcA 68, 315, Soszyński et al. 2020, AcA 70, 101
gal/acep → Soszyński et al. 2017, AcA 67, 103, Soszyński et al. 2017, AcA 67, 297, Udalski et al. 2018, AcA 68, 315, Soszyński et al. 2020, AcA 70, 101
gd/cep, gd/t2cep → Udalski et al. 2018, AcA 68, 315, Soszyński et al. 2020, AcA 70, 101
lmc/cep, smc/cep → Soszyński et al. 2015, AcA 65, 297
lmc/acep, smc/acep → Soszyński et al. 2015, AcA 65, 233
lmc/t2cep, smc/t2cep → Soszyński et al. 2018, AcA 68, 89
blg/rrlyr → Soszyński et al. 2014, AcA 64, 177, Soszyński et al. 2019, AcA 69, 321
gd/rrlyr → Soszyński et al. 2019, AcA 69, 321
lmc/rrlyr, smc/rrlyr → Soszyński et al. 2016, AcA 66, 131
blg/dsct → Pietrukowicz et al. 2020, AcA 70, 241, Soszyński et al. 2021, AcA 71, 189, Pietrukowicz et al. 2022, AcA 72, 161
gd/dsct → Soszyński et al. 2021, AcA 71, 189
lmc/dsct → Soszyński et al. 2023, AcA 73, 105
smc/dsct → Soszyński et al. 2022, AcA 72, 245
blg/ecl → Soszyński et al. 2016, AcA 66, 405
blg/short_period_ecl → Soszyński et al. 2015, AcA 65, 39
blg/dpv → Rojas García et al. 2021, ApJ 922, 30
lmc/ecl, smc/ecl → Głowacki et al. 2024, AcA 74, 241
blg/hb, lmc/hb, smc/hb → Wrona et al. 2022, ApJS 259, 16, Wrona et al. 2022, ApJ 928, 135
blg/lpv, gd/lpv → Iwanek et al. 2022, ApJS 260, 46
blg/rot → Iwanek et al. 2024, AcA 74, 1
blg/transits → Mróz et al. 2023, AcA 73, 127
CBO → Urbanowicz et al. 2026, AcA 76, 83
CV → Mróz et al. 2015, AcA 65, 313
M54 → Hamanowicz et al. 2016, AcA 66, 197

Also cite AAVSO VSX and Gaia.

license: public, with the per-class discovery paper requested
data: https://ogle.astrouw.edu.pl/
release: OCVS