IOTA/IOTA-ES occultation update for (250) Bettina / TYC 7327-01196-1 event on 2023 Aug 10, 12:44 UT Visible from SE Australia Summary ------- On 2023 Aug 10 UT, the 99.1 km diameter asteroid (250) Bettina will occult a 10.0 mag star in the constellation Lupus for observers along a path across SE Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.69 mag to 13.67 mag (the magnitude of the asteroid) for at most 11.720 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: 100 * date and approx. time of event: 2023 Aug 10, 12:33 - 2023 Aug 10, 12:56 * geocentric midpoint of event [JD]: 2460167.03121263 * magnitude of target star: 10.02 * magnitude drop [mag]: 3.69 * estimated maximum duration [s]: 11.720 * Moon: 30 % sunlit, 167° distance * Sun: 103° distance * rough path description: SE Australia The occultation path -------------------- * approximate projected width [km]: 109 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.004, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.005", 0.000", 116°) * approx speed of asteroid's shadow [km/s]: 8.4592 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7327-01196-1 by 250 Bettina on 2023 Aug 10 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 - 19 0 0 -26 35 0 12 33 30.5 0 126 46 -27 11 52 .. .. .. -27 16 12 .. .. .. .... - 18 0 0 -27 13 41 12 33 30.8 1 125 46 -27 50 35 -26 37 0 -27 54 55 -26 32 43 0.44 - 17 0 0 -27 52 15 12 33 31.3 2 125 46 -28 29 11 -27 15 32 -28 33 31 -27 11 15 0.46 - 16 0 0 -28 30 40 12 33 32.1 3 124 45 -29 7 38 -27 53 57 -29 11 58 -27 49 39 0.47 - 15 0 0 -29 8 56 12 33 33.3 5 124 45 -29 45 55 -28 32 12 -29 50 16 -28 27 55 0.47 - 14 0 0 -29 47 1 12 33 34.7 6 123 44 -30 24 1 -29 10 16 -30 28 21 -29 5 59 0.48 - 13 0 0 -30 24 54 12 33 36.4 7 123 44 -31 1 53 -29 48 9 -31 6 14 -29 43 51 0.48 - 12 0 0 -31 2 33 12 33 38.3 8 122 43 -31 39 32 -30 25 48 -31 43 52 -30 21 30 0.48 - 11 0 0 -31 39 56 12 33 40.6 9 122 43 -32 16 55 -31 3 12 -32 21 15 -30 58 55 0.48 - 10 0 0 -32 17 4 12 33 43.1 10 121 42 -32 54 1 -31 40 20 -32 58 21 -31 36 3 0.48 - 9 0 0 -32 53 53 12 33 45.9 11 120 42 -33 30 49 -32 17 11 -33 35 9 -32 12 55 0.48 - 8 0 0 -33 30 24 12 33 48.9 12 120 41 -34 7 18 -32 53 44 -34 11 38 -32 49 27 0.48 - 7 0 0 -34 6 35 12 33 52.2 13 119 40 -34 43 26 -33 29 57 -34 47 46 -33 25 41 0.48 - 6 0 0 -34 42 25 12 33 55.7 14 119 40 -35 19 14 -34 5 50 -35 23 33 -34 1 34 0.48 - 5 0 0 -35 17 53 12 33 59.4 15 118 39 -35 54 38 -34 41 20 -35 58 57 -34 37 5 0.48 - 4 0 0 -35 52 57 12 34 3.3 16 117 39 -36 29 39 -35 16 28 -36 33 58 -35 12 13 0.48 - 3 0 0 -36 27 37 12 34 7.5 17 117 38 -37 4 16 -35 51 12 -37 8 34 -35 46 57 0.48 - 2 0 0 -37 1 53 12 34 11.9 18 116 37 -37 38 27 -36 25 32 -37 42 44 -36 21 17 0.48 - 1 0 0 -37 35 42 12 34 16.4 19 116 37 -38 12 12 -36 59 26 -38 16 29 -36 55 12 0.48 - 0 0 0 -38 9 5 12 34 21.2 20 115 36 -38 45 29 -37 32 53 -38 49 46 -37 28 40 0.48 1 0 0 -38 42 0 12 34 26.1 21 114 35 -39 18 19 -38 5 53 -39 22 35 -38 1 41 0.48 2 0 0 -39 14 27 12 34 31.2 22 113 35 -39 50 41 -38 38 26 -39 54 56 -38 34 14 0.48 3 0 0 -39 46 25 12 34 36.5 23 113 34 -40 22 33 -39 10 30 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4 13 0.50 162 0 0 -28 6 16 12 55 17.0 23 245 -76 -28 43 28 -27 29 18 -28 47 50 -27 24 59 0.50 163 0 0 -27 26 52 12 55 23.2 22 245 -77 -28 4 2 -26 49 55 -28 8 24 -26 45 36 0.50 164 0 0 -26 47 19 12 55 29.1 21 244 -78 -27 24 28 -26 10 24 -27 28 50 -26 6 6 0.51 165 0 0 -26 7 40 12 55 34.7 20 244 -79 -26 44 47 -25 30 47 -26 49 9 -25 26 29 0.51 166 0 0 -25 27 56 12 55 40.1 18 243 -80 -26 5 0 -24 51 5 -26 9 21 -24 46 47 0.51 167 0 0 -24 48 8 12 55 45.1 17 243 -81 -25 25 10 -24 11 20 -25 29 30 -24 7 3 0.51 168 0 0 -24 8 18 12 55 49.9 16 242 -81 -24 45 17 -23 31 34 -24 49 37 -23 27 17 0.51 169 0 0 -23 28 29 12 55 54.3 15 242 -82 -24 5 23 -22 51 48 -24 9 43 -22 47 31 0.52 170 0 0 -22 48 40 12 55 58.5 14 241 -82 -23 25 30 -22 12 3 -23 29 50 -22 7 47 0.52 171 0 0 -22 8 54 12 56 2.3 13 241 -82 -22 45 40 -21 32 22 -22 49 59 -21 28 6 0.52 172 0 0 -21 29 12 12 56 5.8 12 241 -82 -22 5 53 -20 52 45 -22 10 12 -20 48 30 0.53 173 0 0 -20 49 37 12 56 9.1 10 240 -82 -21 26 13 -20 13 14 -21 30 31 -20 9 0 0.53 174 0 0 -20 10 8 12 56 11.9 9 240 -82 -20 46 39 -19 33 51 -20 50 56 -19 29 37 0.54 175 0 0 -19 30 49 12 56 14.5 8 239 -82 -20 7 14 -18 54 37 -20 11 30 -18 50 24 0.54 176 0 0 -18 51 40 12 56 16.7 7 239 -81 -19 27 59 -18 15 34 -19 32 15 -18 11 21 0.55 177 0 0 -18 12 42 12 56 18.6 6 239 -80 -18 48 55 -17 36 43 -18 53 10 -17 32 31 0.57 178 0 0 -17 33 58 12 56 20.1 5 238 -79 -18 10 4 -16 58 5 -18 14 19 -16 53 54 0.59 179 0 0 -16 55 28 12 56 21.3 4 238 -79 -17 31 28 -16 19 41 -17 35 41 -16 15 31 0.62 180 0 0 -16 17 14 12 56 22.2 2 238 -78 -16 53 6 -15 41 34 -16 57 19 -15 37 24 0.68 -179 0 0 -15 39 17 12 56 22.8 1 238 -77 -16 15 2 -15 3 44 -16 19 14 -14 59 35 0.87 -178 0 0 -15 1 37 12 56 23.0 0 237 -76 -15 37 16 .. .. .. -15 41 27 .. .. .. 5.54 Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 6.7 Data for the target star ------------------------ * name: TYC 7327-01196-1 * constellation : Lupus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 40 48.2915 DE: -31 23 21.443 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 40 48.2914 DE: -31 23 21.443 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (250) Bettina asteroid class: approx. diameter [km]: 99 approx. diameter ["]: 0.043 distance from Earth [AU]: 3.16870 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#65 date of fit: 2023 Jul 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): 0.005", 0.000", 115.653° remarks: * orbital elements for (250)Bettina : Mean anomaly = 151.3598960194 deg Arg. of pericenter = 75.7508006693 deg Long. of node = 23.8083532249 deg Inclination = 12.8197649186 deg Eccentricity = 0.1362556686 Semimajor axis = 3.1439870937 AU Perihelion dist = 2.7156010300 AU Mag: H = 7.73, G = 0.15 Epoch of elements : MJD 60166.53118056 TDT (2023 Aug 10.5312) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#652023Jul24,11.72,2023,8,10,12.749103,0.049684,-0.410228,4.740067,0.573198,0.005497,-0.001031,0.000000,0.000000 85.5901,-31.4667,-9.88,15.54,False TYC 7327-01196-1,15.68008098,-31.3892898,0.00,10.02,0.00,0.0,0,,15.70452737,-31.4666803,3.69,0.00,0,0,0 250,Bettina,13.67,99.100,3.1687,0,0,1.029,1.59,,5.2,0 0,151.2660,2023,8,10,75.7508,23.8084,12.8198,0.13626,3.14399,2.71560,7.55,5.0,0.15 1.059,0.0047,0.0003,116,0.0047,Known errors,-1.00,0,-1,-1 20230810_1196-1,60162.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 06, 16:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org