IOTA/IOTA-ES occultation update for (500839) 2013 GW137 / UCAC4 364-067194 event on 2023 May 09, 16:35 UT Visible from Summary ------- On 2023 May 09 UT, the 95.4 km diameter asteroid (500839) 2013 GW137 will occult a 14.9 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.77 mag to 23.70 mag (the magnitude of the asteroid) for at most 3.860 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 0 * date and approx. time of event: 2023 May 09, 16:25 - 2023 May 09, 16:25 * geocentric midpoint of event [JD]: 2460074.18440229 * magnitude of target star: 14.93 * magnitude drop [mag]: 8.77 * estimated maximum duration [s]: 3.860 * Moon: 81 % sunlit, 52° distance * Sun: 179° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 95 * 1 sigma uncertainty interval [path widths]: +/- 234.76 * 1 sigma uncertainty interval [seconds]: +/- 4906.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 3.987, +/- 1.654) * 1 sigma uncertainty ellipse (major, minor, PA): (4.267", 0.650", 111°) * approx speed of asteroid's shadow [km/s]: 24.6886 * website for maps: http://www.asteroidoccultation.com Path Coordinates: No Lat/Long file for this path. Data for the target star ------------------------ * name: UCAC4 364-067194 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 01 54.9381 DE: -17 20 09.029 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 01 54.9381 DE: -17 20 09.029 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 14.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (500839) 2013 GW137 asteroid class: TNO approx. diameter [km]: 95 approx. diameter ["]: 0.003 distance from Earth [AU]: 39.19720 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#6 date of fit: 2021 Apr 14 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 4.267", 0.650", 111.141° remarks: * orbital elements for (500839)2013 GW137 : Mean anomaly = 351.2466417923 deg Arg. of pericenter = 191.5365923417 deg Long. of node = 46.3140430874 deg Inclination = 5.0310585291 deg Eccentricity = 0.0581559965 Semimajor axis = 42.6545995614 AU Perihelion dist = 40.1739788175 AU Mag: H = 7.79, G = 0.15 Epoch of elements : MJD 60073.69125000 TDT (2023 May 09.6913) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#62021Apr14,3.86,2023,5,9,16.425655,0.265360,0.982669,-13.453060,3.632850,0.000027,0.000012,0.000001,0.000000 112.1986,-17.4290,-67.27,17.41,False UCAC4 364-067194,15.03192726,-17.3358415,0.00,14.93,0.00,0.0,0,,15.05396760,-17.4289713,8.76,0.00,0,0,0 500839,2013 GW137,23.70,95.4,39.1972,0,0,-0.210,0.81,,9.4 0,351.2442,2023,5,9,191.5366,46.3140,5.0311,0.05816,42.65460,40.17398,7.70,5.0,0.15 235.756,4.2673,0.6497,111,0.7878,Known errors,-1.00,-1,-1,-1 20230509_067194,59745.16 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Jun 15, 03:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org