Astrometric and photometric standard candidates for the upcoming 4-m ILMT survey. (arXiv:2210.06473v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Dukiya_N/0/1/0/all/0/1">Naveen Dukiya</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Misra_K/0/1/0/all/0/1">Kuntal Misra</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pradhan_B/0/1/0/all/0/1">Bikram Pradhan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Negi_V/0/1/0/all/0/1">Vibhore Negi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ailawadhi_B/0/1/0/all/0/1">Bhavya Ailawadhi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kumar_B/0/1/0/all/0/1">Brajesh Kumar</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hickson_P/0/1/0/all/0/1">Paul Hickson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Surdej_J/0/1/0/all/0/1">Jean Surdej</a>
The International Liquid Mirror Telescope (ILMT) is a 4-meter class survey
telescope that has recently achieved first light and is expected to swing into
full operations by 1st January 2023. It scans the sky in a fixed 22′ wide strip
centered at the declination of $+29^o21’41”$ and works in Time Delay
Integration (TDI) mode. We present a full catalog of sources in the ILMT strip
that can serve as astrometric calibrators. The characteristics of the sources
for astrometric calibration are extracted from Gaia EDR3 as it provides a very
precise measurement of astrometric properties such as RA ($alpha$), Dec
($delta$), parallax ($pi$), and proper motions ($mu_{alpha^{*}}$ &
$mu_{delta}$). We have crossmatched the Gaia EDR3 with SDSS DR17 and
PanSTARRS-1 (PS1) and supplemented the catalog with apparent magnitudes of
these sources in g, r, and i filters. We also present a catalog of
spectroscopically confirmed white dwarfs with SDSS magnitudes that may serve as
photometric calibrators. The catalogs generated are stored in a SQLite database
for query-based access. We also report the offsets in equatorial positions
compared to Gaia for an astrometrically calibrated TDI frame observed with the
ILMT.
The International Liquid Mirror Telescope (ILMT) is a 4-meter class survey
telescope that has recently achieved first light and is expected to swing into
full operations by 1st January 2023. It scans the sky in a fixed 22′ wide strip
centered at the declination of $+29^o21’41”$ and works in Time Delay
Integration (TDI) mode. We present a full catalog of sources in the ILMT strip
that can serve as astrometric calibrators. The characteristics of the sources
for astrometric calibration are extracted from Gaia EDR3 as it provides a very
precise measurement of astrometric properties such as RA ($alpha$), Dec
($delta$), parallax ($pi$), and proper motions ($mu_{alpha^{*}}$ &
$mu_{delta}$). We have crossmatched the Gaia EDR3 with SDSS DR17 and
PanSTARRS-1 (PS1) and supplemented the catalog with apparent magnitudes of
these sources in g, r, and i filters. We also present a catalog of
spectroscopically confirmed white dwarfs with SDSS magnitudes that may serve as
photometric calibrators. The catalogs generated are stored in a SQLite database
for query-based access. We also report the offsets in equatorial positions
compared to Gaia for an astrometrically calibrated TDI frame observed with the
ILMT.
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