IOTA/IOTA-ES occultation update for 2001 KH76 / UCAC4 338-147249 event on 2023 Sep 03, 00:08 UT Visible from Summary ------- On 2023 Sep 03 UT, the 144.5 km diameter asteroid 2001 KH76 will occult a 12.5 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 10.69 mag to 23.22 mag (the magnitude of the asteroid) for at most 18.940 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]: 2460190.94520579 * magnitude of target star: 12.53 * magnitude drop [mag]: 10.69 * estimated maximum duration [s]: 18.940 * Moon: 85 % sunlit, 110° distance * Sun: 116° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 145 * 1 sigma uncertainty interval [path widths]: +/- 835.17 * 1 sigma uncertainty interval [seconds]: +/- 151492.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 38.407, +/- 5.466) * 1 sigma uncertainty ellipse (major, minor, PA): (38.622", 3.648", 84°) * approx speed of asteroid's shadow [km/s]: 7.6308 * website for maps: http://www.asteroidoccultation.com Path Coordinates: No Lat/Long file for this path. Data for the target star ------------------------ * name: UCAC4 338-147249 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 25 30.7945 DE: -22 26 03.441 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 25 30.7945 DE: -22 26 03.441 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: 2001 KH76 asteroid class: TNO approx. diameter [km]: 145 approx. diameter ["]: 0.005 distance from Earth [AU]: 41.93800 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#4 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): 38.622", 3.648", 83.924° remarks: * orbital elements for 2001 KH76 : Mean anomaly = 315.9694135544 deg Arg. of pericenter = 70.7072095620 deg Long. of node = 261.6965584351 deg Inclination = 3.2506085181 deg Eccentricity = 0.1258891488 Semimajor axis = 46.1589166678 AU Perihelion dist = 40.3480099385 AU Mag: H = 6.80, G = 0.15 Epoch of elements : MJD 60190.00569444 TDT (2023 Sep 03.0057) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#42021Apr14,18.94,2023,9,3,10.684939,-0.250470,3.838450,-4.297736,-0.283273,0.005304,0.000209,0.000001,0.000000 134.1501,-22.4215,19.60,7.56,False UCAC4 338-147249,18.42522069,-22.4342893,0.00,12.53,0.00,0.0,0,,18.44907644,-22.4215333,10.69,0.00,0,0,1 0,2001 KH76,23.22,144.5,41.9380,0,0,-0.066,-0.06,,14.5 0,315.9694,2023,9,3,70.7072,261.6966,3.2506,0.12589,46.15892,40.34801,6.80,5.0,0.15 836.171,38.6217,3.6483,84,3.9677,Known errors,-1.00,-1,-1,-1 20230903_147249,59745.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Jun 15, 04:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org