Surveys · 6 of 6

MASCARAMVS

Ground-based, band V. Detections from 2015-02-02 to 2016-04-01.

https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/617/A32 · final: no new data will come

epochs held

26.7 million

26.7 million of them detections

stars with a light curve

3,265

3,265 with ≥ 1 detection

median epochs per star

8,636

all bands

sky with light curves

6.2%

HEALPix order-6 cells, as mapped

Where its stars are

Footprint

Brightness is stars per cell with a light curve from MASCARA (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
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
MASCARA Vmascara:V	600 nm	2 mag	curves_static	3,265	26,698,497	26,698,496	2015-02-02 → 2016-04-01

Magnitude system: The served mag is apparent V: the V magnitude from MASCARA's tables plus its published difference, which is also served as mag_delta.

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 5″, 0.29% chance matches.

MASCARA positions come from ASCC-2.5, which shares Tycho with VSX, so position cannot verify a link; 210 stars are verified by MASCARA's own VSX crossmatch.

ID column: ascc_id
catalog epoch: J2016

ASCC-2.5 IDs are stable, and the MASCARA data set is final.

Caveats

No camera column: overlapping cameras' ~0.02 mag offsets remain in the scatter.
Unfiltered CCD calibrated to V, so its λ_eff is approximate.

LSDB

Bulk access

Light curves are in the nested lc_mascara column of curves_static.

PythonMASCARA 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: MASCARA V
static = lsdb.read_hats(root / ptr["collections"]["curves_static"]["path"],
                        columns=["varchive_id", "ra", "dec", "lc_mascara"])
df = static.cone_search(RA, DEC, 600).compute()   # radius in arcsec
lc = df["lc_mascara"].iloc[0]   # band, bjd_tdb, mag, mag_err, detected, hjd, mag_delta
v = lc[lc["band"] == "V"]   # one band at a time

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

Citation

Talens et al. 2017, A&A 601, A11 The Multi-site All-Sky CAmeRA (MASCARA). Finding transiting exoplanets around bright (mV < 8) stars
Burggraaff et al. 2018, A&A 617, A32 Studying bright variable stars with the Multi-site All-Sky CAmeRA (MASCARA)

This work uses data from the Multi-site All-Sky CAmeRA (MASCARA).

BibTeX · 2 entries from NASA ADS

@ARTICLE{2017A&A...601A..11T,
       author = {{Talens}, G.~J.~J. and {Spronck}, J.~F.~P. and {Lesage}, A.-L. and {Otten}, G.~P.~P.~L. and {Stuik}, R. and {Pollacco}, D. and {Snellen}, I.~A.~G.},
        title = "{The Multi-site All-Sky CAmeRA (MASCARA). Finding transiting exoplanets around bright (m$_{V}$ < 8) stars}",
      journal = {\aap},
     keywords = {surveys, planetary systems, eclipses, telescopes, instrumentation: detectors, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Earth and Planetary Astrophysics},
         year = 2017,
        month = may,
       volume = {601},
          eid = {A11},
        pages = {A11},
          doi = {10.1051/0004-6361/201630319},
archivePrefix = {arXiv},
       eprint = {1702.03931},
 primaryClass = {astro-ph.IM},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2017A&A...601A..11T},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

@ARTICLE{2018A&A...617A..32B,
       author = {{Burggraaff}, O. and {Talens}, G.~J.~J. and {Spronck}, J. and {Lesage}, A.-L. and {Stuik}, R. and {Otten}, G.~P.~P.~L. and {Van Eylen}, V. and {Pollacco}, D. and {Snellen}, I.~A.~G.},
        title = "{Studying bright variable stars with the Multi-site All-Sky CAmeRA (MASCARA)}",
      journal = {\aap},
     keywords = {stars: variables: general, stars: variables: Cepheids, binaries: eclipsing, Astrophysics - Solar and Stellar Astrophysics},
         year = 2018,
        month = sep,
       volume = {617},
          eid = {A32},
        pages = {A32},
          doi = {10.1051/0004-6361/201833142},
archivePrefix = {arXiv},
       eprint = {1806.02247},
 primaryClass = {astro-ph.SR},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2018A&A...617A..32B},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

Also cite AAVSO VSX and Gaia.

license: public (CDS/VizieR)
data: https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/617/A32
release: MVS