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

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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'

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Input Fields

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

NameTable Head DescriptionUnitUCD
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.

NameTable Head DescriptionUnitUCD
_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.

NameTable Head DescriptionUnitUCD 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

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