IOTA/IOTA-ES occultation update for 2005 JK186 / UCAC4 256-166978 event on 2023 Jun 22, 15:20 UT Visible from Summary ------- On 2023 Jun 22 UT, the 158.5 km diameter asteroid 2005 JK186 will occult a 14.3 mag star in the constellation Corona Australis for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.90 mag to 22.19 mag (the magnitude of the asteroid) for at most 6.520 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: predicted path center does not land on Earth. * geocentric midpoint of event [JD]: 2460118.18218933 * magnitude of target star: 14.29 * magnitude drop [mag]: 7.90 * estimated maximum duration [s]: 6.520 * Moon: 18 % sunlit, 134° distance * Sun: 164° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 159 * 1 sigma uncertainty interval [path widths]: +/- 393.32 * 1 sigma uncertainty interval [seconds]: +/- 4288.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 4.433, +/- 1.796) * 1 sigma uncertainty ellipse (major, minor, PA): (4.756", 0.508", 111°) * approx speed of asteroid's shadow [km/s]: 24.3009 * website for maps: http://www.asteroidoccultation.com Path Coordinates: No Lat/Long file for this path. Data for the target star ------------------------ * name: UCAC4 256-166978 * constellation : Corona Australis * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 23 27.5651 DE: -38 49 06.645 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 23 27.5651 DE: -38 49 06.646 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 14.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: 2005 JK186 asteroid class: TNO approx. diameter [km]: 159 approx. diameter ["]: 0.006 distance from Earth [AU]: 34.98660 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#5 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): 4.756", 0.508", 111.362° remarks: * orbital elements for 2005 JK186 : Mean anomaly = 350.8480869393 deg Arg. of pericenter = 230.0023884482 deg Long. of node = 63.2222674695 deg Inclination = 27.2908876304 deg Eccentricity = 0.2457885992 Semimajor axis = 47.3417451772 AU Perihelion dist = 35.7056839444 AU Mag: H = 6.60, G = 0.15 Epoch of elements : MJD 60117.63951389 TDT (2023 Jun 22.6395) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#52021Apr14,6.52,2023,6,22,16.372544,1.172319,-7.346847,-13.544950,-2.160118,-0.000460,0.001536,0.000001,0.000000 120.0935,-38.8065,-65.07,23.43,False UCAC4 256-166978,18.39099030,-38.8185127,0.00,14.29,0.00,0.0,0,,18.41830366,-38.8064513,7.90,0.00,0,0,1 0,2005 JK186,22.19,158.5,34.9866,0,0,-0.291,-0.55,,15.8 0,350.8462,2023,6,22,230.0024,63.2223,27.2909,0.24579,47.34175,35.70568,6.60,5.0,0.15 394.317,4.7563,0.5083,111,2.4568,Known errors,-1.00,-1,-1,-1 20230622_166978,59745.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Jun 15, 04:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org