IOTA/IOTA-ES occultation update for (778) Theobalda / UCAC4 258-150442 event on 2024 Jun 02, 19:04 UT Visible from Summary ------- On 2024 Jun 02 UT, the 61.128468611923 km diameter asteroid (778) Theobalda will occult a 11.5 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 4.15 mag to 15.61 mag (the magnitude of the asteroid) for at most 4.020 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: 99 * date and approx. time of event: 2024 Jun 02, 18:57 - 2024 Jun 02, 19:11 * geocentric midpoint of event [JD]: 2460464.29485904 * magnitude of target star: 11.48 * magnitude drop [mag]: 4.15 * estimated maximum duration [s]: 4.020 * Moon: 18 % sunlit, 112° distance * Sun: 157° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 61 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 2.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.002", 81°) * approx speed of asteroid's shadow [km/s]: 15.2526 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 258-150442 by 778 Theobalda on 2024 Jun 2 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 2 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 1 46 3 .. .. .. 1 40 54 .... 3 0 0 1 19 19 19 11 33.0 1 129 -19 1 40 40 0 57 58 1 45 49 0 52 50 .... 4 0 0 0 31 20 19 11 32.7 2 129 -20 0 52 40 0 10 1 0 57 48 0 4 53 0.02 5 0 0 - 0 16 28 19 11 32.2 4 129 -22 0 4 49 - 0 37 45 0 9 57 - 0 42 53 -0.02 6 0 0 - 1 4 5 19 11 31.5 5 129 -23 - 0 42 49 - 1 25 20 - 0 37 42 - 1 30 27 -0.04 7 0 0 - 1 51 28 19 11 30.6 6 129 -24 - 1 30 15 - 2 12 40 - 1 25 8 - 2 17 47 -0.05 8 0 0 - 2 38 35 19 11 29.5 7 129 -25 - 2 17 24 - 2 59 45 - 2 12 18 - 3 4 51 -0.05 9 0 0 - 3 25 25 19 11 28.3 9 128 -27 - 3 4 17 - 3 46 32 - 2 59 11 - 3 51 37 -0.06 10 0 0 - 4 11 56 19 11 26.8 10 128 -28 - 3 50 51 - 4 33 0 - 3 45 46 - 4 38 4 -0.06 11 0 0 - 4 58 6 19 11 25.1 11 128 -29 - 4 37 4 - 5 19 7 - 4 32 0 - 5 24 10 -0.06 12 0 0 - 5 43 54 19 11 23.2 12 128 -30 - 5 22 55 - 6 4 51 - 5 17 52 - 6 9 54 -0.07 13 0 0 - 6 29 18 19 11 21.2 14 128 -31 - 6 8 23 - 6 50 12 - 6 3 20 - 6 55 14 -0.07 14 0 0 - 7 14 16 19 11 18.9 15 128 -33 - 6 53 25 - 7 35 7 - 6 48 24 - 7 40 8 -0.07 15 0 0 - 7 58 48 19 11 16.5 16 128 -34 - 7 38 1 - 8 19 35 - 7 33 1 - 8 24 35 -0.07 16 0 0 - 8 42 53 19 11 14.0 17 128 -35 - 8 22 9 - 9 3 35 - 8 17 10 - 9 8 35 -0.07 17 0 0 - 9 26 28 19 11 11.2 19 128 -36 - 9 5 49 - 9 47 6 - 9 0 50 - 9 52 4 -0.07 18 0 0 -10 9 32 19 11 8.3 20 127 -37 - 9 48 58 -10 30 7 - 9 44 0 -10 35 4 -0.07 19 0 0 -10 52 6 19 11 5.2 21 127 -38 -10 31 35 -11 12 36 -10 26 39 -11 17 32 -0.07 20 0 0 -11 34 7 19 11 2.0 22 127 -40 -11 13 41 -11 54 32 -11 8 45 -11 59 27 -0.07 21 0 0 -12 15 34 19 10 58.7 23 127 -41 -11 55 13 -12 35 55 -11 50 18 -12 40 49 -0.07 22 0 0 -12 56 28 19 10 55.2 25 127 -42 -12 36 11 -13 16 44 -12 31 17 -13 21 37 -0.07 23 0 0 -13 36 46 19 10 51.6 26 127 -43 -13 16 34 -13 56 57 -13 11 41 -14 1 49 -0.07 24 0 0 -14 16 28 19 10 47.8 27 126 -44 -13 56 21 -14 36 35 -13 51 30 -14 41 26 -0.07 25 0 0 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Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.4 Data for the target star ------------------------ * name: UCAC4 258-150442 * constellation : Corona Australis * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 59 11.3584 DE: -38 32 43.697 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 59 11.3584 DE: -38 32 43.697 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.5 * B mag [mag]: 12.7 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (778) Theobalda asteroid class: approx. diameter [km]: 61 approx. diameter ["]: 0.028 distance from Earth [AU]: 3.01310 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#52 date of fit: 2023 Apr 24 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): 0.017", 0.002", 80.7° remarks: * orbital elements for (778)Theobalda : Mean anomaly = 160.9818890724 deg Arg. of pericenter = 135.0814717380 deg Long. of node = 321.2017238559 deg Inclination = 13.7117810483 deg Eccentricity = 0.2565755329 Semimajor axis = 3.1796529859 AU Perihelion dist = 2.3638318267 AU Mag: H = 9.77, G = 0.15 Epoch of elements : MJD 60463.79485946 TDT (2024 Jun 02.7949) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr24,4.02,2024,6,2,19.076617,-0.001510,0.066839,-8.606726,-0.196493,-0.001763,0.001432,0.000001,0.000000 92.3355,-38.5474,-106.61,22.32,False UCAC4 258-150442,17.98648845,-38.5454712,12.66,11.48,10.84,0.1,0,,18.01491946,-38.5473590,4.16,4.34,0,0,0 778,Theobalda,15.61,61.347,3.0131,0,0,-2.141,-0.57,,3.0,0 0,160.8437,2024,6,2,135.0815,321.2017,13.7118,0.25658,3.17965,2.36383,9.77,5.0,0.15 1.120,0.0167,0.0025,81,0.0034,Known errors,0.79,0,-1,-1 20240602_150442,60139.37 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 08:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org