Information on Service 'Astrometric Microlensing Events Predicted from Gaia DR2'

Further access options are discussed below

From the Gaia DR2 catalogue we predict astrometric microlensing events by foreground stars with high proper motion (µ_tot >150mas/yr) passing a background source in the next decades. Using Gaia DR2 photometry we determine an approximate mass of the lens, which we use to calculate the expected microlensing effects. This yields 3914 microlensing events by 2875 different lenses between 2010 and 2065 with expected shifts larger than 0.1 mas between the lensed and unlensed positions of the source. 513 of those are expected to happen between 2014.5 - 2026.5 and might be measured by Gaia. For 127 events we also expect a magnification between 1 mmag and 3 mag.

For a list of all services and tables belonging to this service's resource, see Information on resource 'Astrometric Microlensing Events Predicted from Gaia DR2'

Overview

You can access this service using:

scs.xml -- a standard SCS interface as defined by the IVOA to access catalog-type data; SCS clients use https://dc.zah.uni-heidelberg.de/amlensing/q2/q/scs.xml? to access the service
form -- an interface for web browsers through an HTML form

This service is published as follows:

Within the set(s) ivo_managed with the renderer dali
Within the set(s) local,ivo_managed with the renderer form
Within the set(s) ivo_managed with the renderer scs.xml

local means it is listed on our front page, ivo_managed means it has a record in the VO registry.

Input Fields

The following fields are available to provide input to the service (with some renderers, some of these fields may be unavailable):

Name	Table Head	Description	Unit	UCD
DEC	Delta (ICRS)	Declination (ICRS decimal)	deg	pos.eq.dec
dist	d_min ♁	Estimated distance at closest approach.	mas	pos.angdistance
hscs_pos	Position/Name	Coordinates (as h m s, d m s or decimal degrees), or SIMBAD-resolvable object	N/A	N/A
hscs_sr	Search radius	Search radius in arcminutes	N/A	N/A
lens_phot_g_mean_mag	L. Mag G	Mean magnitude of the lens in the integrated G band from Gaia DR2.	mag	phot.mag;em.opt.V
maxrec	Match limit	Maximum number of records returned. Pass 0 to retrieve service parameters.	N/A	N/A
ob_phot_g_mean_mag	O. Mag G	Mean magnitude of the lensed object in the integrated G band from Gaia DR2.	mag	phot.mag;em.opt.V
RA	Alpha (ICRS)	Right Ascension (ICRS decimal)	deg	pos.eq.ra
responseformat	Output Format	File format requested for output.	N/A	meta.code.mime
SR	Search Radius	Search radius	deg	N/A
tca	T_min ♁	Estimated time of the closest approach.	yr	time.epoch
verb	Verbosity	Exhaustiveness of column selection. VERB=1 only returns the most important columns, VERB=2 selects the columns deemed useful to the average user, VERB=3 returns a table with all available columns.	N/A	N/A

Default Output Fields

The following fields are contained in the output by default. More fields may be available for selection; these would be given below in the VOTable output fields.

Name	Table Head	Description	Unit	UCD
_r	Dist.	Distance to cone center	deg	pos.distance
dist	d_min ♁	Estimated distance at closest approach.	mas	pos.angdistance
err_dist	Err. d_min ♁	Error d_min.	mas	stat.error;pos.angdistance
err_magnification	Err. δm ♁	Error in magnification.	mag	stat.error;phot.mag;arith.ratio
err_shift	Err. A shift ♁	Error in shift	mas	stat.error;pos;arith.diff
err_shift_lum	Err. L shift ♁	Error in shift_lum.	mas	stat.error;pos;arith.diff
err_shift_plus	Err. shift+ ♁	Error in shift_plus.	mas	stat.error;pos;arith.diff
err_tca	Err. T_min ♁	Error in tca.	yr	stat.error;time.epoch
err_theta_e	Err. θ_E	Error in the Einstein radius of the event	mas	stat.error;phys.angsize
err_u	Err. u ♁	Error in u.	N/A	N/A
event_id	Event ID	Unique identifier of this event. This is the decimal representation of the Gaia DR2 source_id of the lens, and a disambiguator for the lensed object.	N/A	meta.id;meta.main
l2_dist	d_min L2	Estimated distance at closest approachas seen from Earth-Sun L2 point.	mas	pos.angdistance
l2_err_dist	Err. d_min L2	Error l2_d_min.	mas	stat.error;pos.angdistance
l2_err_magnification	Err. δm L2	Error in l2_magnification.	mag	stat.error;phot.mag;arith.ratio
l2_err_shift	Err. A shift L2	Error in l2_shift	mas	stat.error;pos;arith.diff
l2_err_shift_lum	Err. L shift L2	Error in l2_shift_lum.	mas	stat.error;pos;arith.diff
l2_err_shift_plus	Err. shift+ L2	Error in l2_shift_plus.	mas	stat.error;pos;arith.diff
l2_err_tca	Err. T_min L2	Error in l2_tca.	yr	stat.error;time.epoch
l2_err_u	Err. u L2	Error in l2_u.	N/A	N/A
l2_magnification	δm L2	Maximal magnificationas seen from Earth-Sun L2 point.	mag	phot.mag;arith.ratio
l2_shift	A shift L2	Maximal astrometric shift of the center of lightas seen from Earth-Sun L2 point.	mas	pos;arith.diff
l2_shift_lum	L shift L2	Maximal astrometric shift including lens-luminosity effectsas seen from Earth-Sun L2 point.	mas	pos;arith.diff
l2_shift_plus	Shift+ L2	Maximal astrometric shift of brighter imageas seen from Earth-Sun L2 point.	mas	pos;arith.diff
l2_tca	T_min L2	Estimated time of the closest approachas seen from Earth-Sun L2 point.	yr	time.epoch
l2_u	u L2	Estimated distance at closest approach in Einstein radiias seen from Earth-Sun L2 point.	N/A	N/A
lens_dec	L. Dec	Gaia DR2 Declication of the lens	deg	pos.eq.dec;meta.main
lens_err_dec	Err(L.dec)	Error of lens__dec from Gaia DR2	deg	stat.error;pos.eq.dec;meta.main
lens_err_ra	Err(L. RA)	Error of lens__ra from Gaia DR2	deg	stat.error;pos.eq.ra;meta.main
lens_parallax	L. Parallax	Parallax of the lens from Gaia DR2	deg	pos.parallax
lens_phot_bp_mean_mag	L. Mag BP	Mean magnitude of the lens in the integrated BP band from Gaia DR2.	mag	phot.mag;em.opt.B
lens_phot_g_mean_mag	L. Mag G	Mean magnitude of the lens in the integrated G band from Gaia DR2.	mag	phot.mag;em.opt.V
lens_phot_rp_mean_mag	L. Mag RP	Mean magnitude of the lens in the integrated RP band from Gaia DR2.	mag	phot.mag;em.opt.R
lens_pmdec	L. PM Dec	Proper motion in Declination of the lens from Gaia DR2	deg/yr	pos.pm;pos.eq.ra
lens_pmra	L. PM RA	Proper motion in RA of the lens from Gaia DR2	deg/yr	pos.pm;pos.eq.ra
lens_ra	L. RA	Gaia DR2 RA of the lens	deg	pos.eq.ra;meta.main
magnification	δm ♁	Maximal magnification.	mag	phot.mag;arith.ratio
mass	L. Mass	Estimated mass of the lens from Gaia DR2	solMass	phys.mass
ob_dec	O. Dec	Gaia DR2 Declication of the lensed object	deg	pos.eq.dec
ob_err_dec	Err(L.dec)	Error of ob__dec from Gaia DR2	deg	stat.error;pos.eq.dec
ob_err_ra	Err(O. RA)	Error of ob__ra from Gaia DR2	deg	stat.error;pos.eq.ra
ob_parallax	O. Parallax	Parallax of the lensed object from Gaia DR2	deg	pos.parallax
ob_phot_bp_mean_mag	O. Mag BP	Mean magnitude of the lensed object in the integrated BP band from Gaia DR2.	mag	phot.mag;em.opt.B
ob_phot_g_mean_mag	O. Mag G	Mean magnitude of the lensed object in the integrated G band from Gaia DR2.	mag	phot.mag;em.opt.V
ob_phot_rp_mean_mag	O. Mag RP	Mean magnitude of the lensed object in the integrated RP band from Gaia DR2.	mag	phot.mag;em.opt.R
ob_pmdec	O. PM Dec	Proper motion in Declination of the lensed object from Gaia DR2	deg/yr	pos.pm;pos.eq.ra
ob_pmra	O. PM RA	Proper motion in RA of the lensed object from Gaia DR2	deg/yr	pos.pm;pos.eq.ra
ob_ra	O. RA	Gaia DR2 RA of the lensed object	deg	pos.eq.ra
shift	A shift ♁	Maximal astrometric shift of the center of light.	mas	pos;arith.diff
shift_lum	L shift ♁	Maximal astrometric shift including lens-luminosity effects.	mas	pos;arith.diff
shift_plus	Shift+ ♁	Maximal astrometric shift of brighter image.	mas	pos;arith.diff
star_type	L. Class	Type of the lensing star: WD = White Dwarf, MS = Main Sequence, RG = Red Giant, BD = Brown Dwarf	N/A	src.class
tca	T_min ♁	Estimated time of the closest approach.	yr	time.epoch
theta_e	θ_E	Einstein radius of the event	mas	phys.angsize
time_scale	Duration	Approximate duration of the event	yr	time.duration
u	u ♁	Estimated distance at closest approach in Einstein radii.	N/A	N/A

VOTable Output Fields

The following fields are available in VOTable output. The verbosity level is a number intended to represent the relative importance of the field on a scale of 1 to 30. The services take a VERB argument. A field is included in the output if their verbosity level is less or equal VERB*10.

Name	Table Head	Description	Unit	UCD	Verb. Level
event_id	Event ID	Unique identifier of this event. This is the decimal representation of the Gaia DR2 source_id of the lens, and a disambiguator for the lensed object.	N/A	meta.id;meta.main	1
lens_ra	L. RA	Gaia DR2 RA of the lens	deg	pos.eq.ra;meta.main	1
lens_dec	L. Dec	Gaia DR2 Declication of the lens	deg	pos.eq.dec;meta.main	1
ob_ra	O. RA	Gaia DR2 RA of the lensed object	deg	pos.eq.ra	1
ob_dec	O. Dec	Gaia DR2 Declication of the lensed object	deg	pos.eq.dec	1
lens_phot_g_mean_mag	L. Mag G	Mean magnitude of the lens in the integrated G band from Gaia DR2.	mag	phot.mag;em.opt.V	5
lens_phot_rp_mean_mag	L. Mag RP	Mean magnitude of the lens in the integrated RP band from Gaia DR2.	mag	phot.mag;em.opt.R	5
lens_phot_bp_mean_mag	L. Mag BP	Mean magnitude of the lens in the integrated BP band from Gaia DR2.	mag	phot.mag;em.opt.B	5
ob_phot_g_mean_mag	O. Mag G	Mean magnitude of the lensed object in the integrated G band from Gaia DR2.	mag	phot.mag;em.opt.V	5
ob_phot_rp_mean_mag	O. Mag RP	Mean magnitude of the lensed object in the integrated RP band from Gaia DR2.	mag	phot.mag;em.opt.R	5
ob_phot_bp_mean_mag	O. Mag BP	Mean magnitude of the lensed object in the integrated BP band from Gaia DR2.	mag	phot.mag;em.opt.B	5
star_type	L. Class	Type of the lensing star: WD = White Dwarf, MS = Main Sequence, RG = Red Giant, BD = Brown Dwarf	N/A	src.class	5
theta_e	θ_E	Einstein radius of the event	mas	phys.angsize	5
time_scale	Duration	Approximate duration of the event	yr	time.duration	5
tca	T_min ♁	Estimated time of the closest approach.	yr	time.epoch	5
dist	d_min ♁	Estimated distance at closest approach.	mas	pos.angdistance	5
err_dist	Err. d_min ♁	Error d_min.	mas	stat.error;pos.angdistance	5
shift	A shift ♁	Maximal astrometric shift of the center of light.	mas	pos;arith.diff	5
shift_lum	L shift ♁	Maximal astrometric shift including lens-luminosity effects.	mas	pos;arith.diff	5
shift_plus	Shift+ ♁	Maximal astrometric shift of brighter image.	mas	pos;arith.diff	5
magnification	δm ♁	Maximal magnification.	mag	phot.mag;arith.ratio	5
l2_tca	T_min L2	Estimated time of the closest approachas seen from Earth-Sun L2 point.	yr	time.epoch	5
l2_dist	d_min L2	Estimated distance at closest approachas seen from Earth-Sun L2 point.	mas	pos.angdistance	5
l2_err_dist	Err. d_min L2	Error l2_d_min.	mas	stat.error;pos.angdistance	5
l2_shift	A shift L2	Maximal astrometric shift of the center of lightas seen from Earth-Sun L2 point.	mas	pos;arith.diff	5
l2_shift_lum	L shift L2	Maximal astrometric shift including lens-luminosity effectsas seen from Earth-Sun L2 point.	mas	pos;arith.diff	5
l2_shift_plus	Shift+ L2	Maximal astrometric shift of brighter imageas seen from Earth-Sun L2 point.	mas	pos;arith.diff	5
l2_magnification	δm L2	Maximal magnificationas seen from Earth-Sun L2 point.	mag	phot.mag;arith.ratio	5
_r	Dist.	Distance to cone center	deg	pos.distance	10
lens_err_ra	Err(L. RA)	Error of lens__ra from Gaia DR2	deg	stat.error;pos.eq.ra;meta.main	15
lens_err_dec	Err(L.dec)	Error of lens__dec from Gaia DR2	deg	stat.error;pos.eq.dec;meta.main	15
lens_pmra	L. PM RA	Proper motion in RA of the lens from Gaia DR2	deg/yr	pos.pm;pos.eq.ra	15
lens_pmdec	L. PM Dec	Proper motion in Declination of the lens from Gaia DR2	deg/yr	pos.pm;pos.eq.ra	15
lens_parallax	L. Parallax	Parallax of the lens from Gaia DR2	deg	pos.parallax	15
ob_err_ra	Err(O. RA)	Error of ob__ra from Gaia DR2	deg	stat.error;pos.eq.ra	15
ob_err_dec	Err(L.dec)	Error of ob__dec from Gaia DR2	deg	stat.error;pos.eq.dec	15
ob_pmra	O. PM RA	Proper motion in RA of the lensed object from Gaia DR2	deg/yr	pos.pm;pos.eq.ra	15
ob_pmdec	O. PM Dec	Proper motion in Declination of the lensed object from Gaia DR2	deg/yr	pos.pm;pos.eq.ra	15
ob_parallax	O. Parallax	Parallax of the lensed object from Gaia DR2	deg	pos.parallax	15
err_theta_e	Err. θ_E	Error in the Einstein radius of the event	mas	stat.error;phys.angsize	15
err_tca	Err. T_min ♁	Error in tca.	yr	stat.error;time.epoch	15
u	u ♁	Estimated distance at closest approach in Einstein radii.	N/A	N/A	15
err_u	Err. u ♁	Error in u.	N/A	N/A	15
err_shift	Err. A shift ♁	Error in shift	mas	stat.error;pos;arith.diff	15
err_shift_lum	Err. L shift ♁	Error in shift_lum.	mas	stat.error;pos;arith.diff	15
err_shift_plus	Err. shift+ ♁	Error in shift_plus.	mas	stat.error;pos;arith.diff	15
err_magnification	Err. δm ♁	Error in magnification.	mag	stat.error;phot.mag;arith.ratio	15
l2_err_tca	Err. T_min L2	Error in l2_tca.	yr	stat.error;time.epoch	15
l2_u	u L2	Estimated distance at closest approach in Einstein radiias seen from Earth-Sun L2 point.	N/A	N/A	15
l2_err_u	Err. u L2	Error in l2_u.	N/A	N/A	15
l2_err_shift	Err. A shift L2	Error in l2_shift	mas	stat.error;pos;arith.diff	15
l2_err_shift_lum	Err. L shift L2	Error in l2_shift_lum.	mas	stat.error;pos;arith.diff	15
l2_err_shift_plus	Err. shift+ L2	Error in l2_shift_plus.	mas	stat.error;pos;arith.diff	15
l2_err_magnification	Err. δm L2	Error in l2_magnification.	mag	stat.error;phot.mag;arith.ratio	15
mass	L. Mass	Estimated mass of the lens from Gaia DR2	solMass	phys.mass	20
lens_id	L. ID	Gaia DR2 source_id of the lens.	N/A	meta.id	25
lens_err_pmra	Err(L. PM RA)	Error of lens_pmra from Gaia DR2	deg/yr	pos.pm;pos.eq.ra	25
lens_err_pmdec	Err(L. PM Dec)	Error of lens_pmdec from Gaia DR2	deg/yr	pos.pm;pos.eq.dec	25
lens_err_parallax	Err. L. Par.	Standard error of the parallax the lens from Gaia DR2	deg	stat.error;pos.parallax	25
ob_id	O. ID	Gaia DR2 source_id of the lensed object.	N/A	meta.id	25
ob_err_pmra	Err(O. PM RA)	Error of ob_pmra from Gaia DR2	deg/yr	pos.pm;pos.eq.ra	25
ob_err_pmdec	Err(O. PM Dec)	Error of ob_pmdec from Gaia DR2	deg/yr	pos.pm;pos.eq.dec	25
ob_err_parallax	Err. O. Par.	Standard error of the parallax the lensed object from Gaia DR2	deg	stat.error;pos.parallax	25
err_mass	Err. L. Mass	Error in the mass of the lens from Gaia DR2	solMass	stat.error;phys.mass	30

Copyright, License, Acknowledgements

To the extent possible under law, the publisher has waived all copyright and related or neighboring rights to the catalogue of astrometric microlensing events. For details, see the Creative Commons CC0 1.0 Public Domain dedication. Of course, you should still give proper credit when using this data as required by good scientific practice.
https://spdx.org/licenses/CC0-1.0.html
This work has made use of data from the European Space Agency (ESA) mission Gaia, processed by the Gaia Data Processing and Analysis Consortium (DPAC). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.

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