IOTA/IOTA-ES occultation update for (750) Oskar / UCAC4 345-078560 event on 2024 Jun 27, 00:08 UT Visible from Summary ------- On 2024 Jun 27 UT, the 21.8588252263193 km diameter asteroid (750) Oskar will occult a 11.0 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.09 mag to 16.06 mag (the magnitude of the asteroid) for at most 3.580 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 26, 23:50 - 2024 Jun 27, 00:26 * geocentric midpoint of event [JD]: 2460488.50590958 * magnitude of target star: 10.98 * magnitude drop [mag]: 5.09 * estimated maximum duration [s]: 3.580 * Moon: 71 % sunlit, 100° distance * Sun: 146° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 0.29 * 1 sigma uncertainty interval [seconds]: +/- 3.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.001", 107°) * approx speed of asteroid's shadow [km/s]: 6.1381 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 345-078560 by 750 Oskar on 2024 Jun 27 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 -131 0 0 0 50 30 0 25 49.8 1 111 32 0 56 54 0 44 7 1 0 37 0 40 23 .... -130 0 0 0 27 15 0 25 49.3 2 111 31 0 33 39 0 20 52 0 37 22 0 17 8 0.04 -129 0 0 0 4 2 0 25 48.4 3 111 30 0 10 25 - 0 2 21 0 14 9 - 0 6 5 0.01 -128 0 0 - 0 19 9 0 25 47.2 4 111 29 - 0 12 45 - 0 25 32 - 0 9 2 - 0 29 15 0.00 -127 0 0 - 0 42 17 0 25 45.6 5 111 28 - 0 35 53 - 0 48 40 - 0 32 10 - 0 52 23 0.00 -126 0 0 - 1 5 21 0 25 43.7 6 111 27 - 0 58 58 - 1 11 44 - 0 55 14 - 1 15 27 -0.01 -125 0 0 - 1 28 21 0 25 41.4 7 111 26 - 1 21 58 - 1 34 44 - 1 18 15 - 1 38 27 -0.01 -124 0 0 - 1 51 17 0 25 38.7 8 111 25 - 1 44 54 - 1 57 40 - 1 41 11 - 2 1 23 -0.02 -123 0 0 - 2 14 8 0 25 35.7 9 111 24 - 2 7 45 - 2 20 30 - 2 4 2 - 2 24 13 -0.02 -122 0 0 - 2 36 53 0 25 32.4 11 111 23 - 2 30 31 - 2 43 15 - 2 26 48 - 2 46 58 -0.02 -121 0 0 - 2 59 32 0 25 28.7 12 111 22 - 2 53 10 - 3 5 54 - 2 49 27 - 3 9 37 -0.02 -120 0 0 - 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7 8 28 23 52 5.2 - 18 250 -52 - 7 2 9 - 7 14 47 - 6 58 28 - 7 18 28 -0.02 40 0 0 - 6 47 20 23 51 59.5 - 17 250 -51 - 6 41 0 - 6 53 39 - 6 37 19 - 6 57 21 -0.02 41 0 0 - 6 26 0 23 51 54.0 - 16 250 -50 - 6 19 40 - 6 32 20 - 6 15 59 - 6 36 2 -0.02 42 0 0 - 6 4 30 23 51 48.9 - 15 250 -49 - 5 58 10 - 6 10 51 - 5 54 29 - 6 14 32 -0.02 43 0 0 - 5 42 50 23 51 44.0 - 14 250 -48 - 5 36 30 - 5 49 11 - 5 32 48 - 5 52 53 -0.02 44 0 0 - 5 21 0 23 51 39.5 - 13 250 -47 - 5 14 39 - 5 27 21 - 5 10 57 - 5 31 3 -0.02 45 0 0 - 4 59 1 23 51 35.4 - 12 249 -45 - 4 52 40 - 5 5 22 - 4 48 58 - 5 9 4 -0.02 46 0 0 - 4 36 53 23 51 31.5 - 11 249 -44 - 4 30 31 - 4 43 14 - 4 26 49 - 4 46 56 -0.02 47 0 0 - 4 14 36 23 51 28.0 - 10 249 -43 - 4 8 14 - 4 20 57 - 4 4 31 - 4 24 40 -0.02 48 0 0 - 3 52 11 23 51 24.8 - 9 249 -42 - 3 45 49 - 3 58 33 - 3 42 6 - 4 2 15 -0.02 49 0 0 - 3 29 38 23 51 22.0 - 8 249 -41 - 3 23 16 - 3 36 0 - 3 19 33 - 3 39 43 -0.02 50 0 0 - 3 6 58 23 51 19.5 - 7 249 -40 - 3 0 36 - 3 13 21 - 2 56 53 - 3 17 3 -0.02 51 0 0 - 2 44 11 23 51 17.3 - 6 249 -39 - 2 37 49 - 2 50 34 - 2 34 6 - 2 54 17 -0.01 52 0 0 - 2 21 18 23 51 15.5 - 5 249 -38 - 2 14 56 - 2 27 41 - 2 11 12 - 2 31 24 -0.01 53 0 0 - 1 58 20 23 51 14.1 - 4 249 -37 - 1 51 57 - 2 4 43 - 1 48 13 - 2 8 26 0.00 54 0 0 - 1 35 16 23 51 13.0 - 3 249 -36 - 1 28 53 - 1 41 39 - 1 25 9 - 1 45 22 0.01 55 0 0 - 1 12 7 23 51 12.2 - 2 249 -35 - 1 5 44 - 1 18 30 - 1 2 0 - 1 22 14 0.04 56 0 0 - 0 48 54 23 51 11.9 - 1 249 -34 - 0 42 31 - 0 55 18 - 0 38 47 - 0 59 1 0.16 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 14.4 Data for the target star ------------------------ * name: UCAC4 345-078560 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 57 19.0418 DE: -21 00 17.537 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 57 19.0417 DE: -21 00 17.537 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.0 * B mag [mag]: 11.7 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (750) Oskar asteroid class: approx. diameter [km]: 22 approx. diameter ["]: 0.019 distance from Earth [AU]: 1.61560 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): 0.019", 0.001", 107.2° remarks: * orbital elements for (750)Oskar : Mean anomaly = 97.3598150824 deg Arg. of pericenter = 73.4903830133 deg Long. of node = 69.5434442274 deg Inclination = 3.9481684903 deg Eccentricity = 0.1286957614 Semimajor axis = 2.4446967266 AU Perihelion dist = 2.1300746200 AU Mag: H = 12.25, G = 0.15 Epoch of elements : MJD 60488.00590954 TDT (2024 Jun 27.0059) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr24,3.58,2024,6,27,0.141830,0.000147,0.005536,-3.464014,0.058163,0.002955,-0.000560,0.000001,0.000000 -38.0386,-21.0769,178.65,23.31,False UCAC4 345-078560,15.95528940,-21.0048713,11.69,10.98,10.60,0.1,0,,15.97945525,-21.0768705,5.09,5.03,0,0,0 750,Oskar,16.06,21.976,1.6156,0,0,-1.346,0.31,,1.4,0 0,97.1004,2024,6,26,73.4904,69.5434,3.9482,0.12870,2.44470,2.13007,12.25,5.0,0.15 1.291,0.0190,0.0013,107,0.0055,Known errors,1.40,0,-1,-1 20240627_078560,60139.40 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 09:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org