IOTA/IOTA-ES occultation update for (250) Bettina / TYC 7329-01656-1 event on 2023 Sep 11, 13:22 UT Visible from Antarctica Summary ------- On 2023 Sep 11 UT, the 99.1 km diameter asteroid (250) Bettina will occult a 10.7 mag star in the constellation Lupus for observers along a path across Antarctica. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.31 mag to 13.97 mag (the magnitude of the asteroid) for at most 4.580 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: 100 * date and approx. time of event: 2023 Sep 11, 13:18 - 2023 Sep 11, 13:26 * geocentric midpoint of event [JD]: 2460199.05711279 * magnitude of target star: 10.71 * magnitude drop [mag]: 3.31 * estimated maximum duration [s]: 4.580 * Moon: 11 % sunlit, 116° distance * Sun: 77° distance * rough path description: Antarctica The occultation path -------------------- * approximate projected width [km]: 128 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.005, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.005", 0.001", 112°) * approx speed of asteroid's shadow [km/s]: 21.6155 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7329-01656-1 by 250 Bettina on 2023 Sep 11 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 - 59 0 0 -29 32 27 13 18 25.6 0 127 40 -30 16 25 .. .. .. -30 20 41 .. .. .. .... - 58 0 0 -30 12 9 13 18 25.7 1 126 40 -30 56 21 -29 28 31 -31 0 39 -29 24 21 0.65 - 57 0 0 -30 52 9 13 18 25.9 2 126 40 -31 36 36 -30 8 18 -31 40 55 -30 4 7 0.74 - 56 0 0 -31 32 27 13 18 26.3 3 125 41 -32 17 8 -30 48 22 -32 21 28 -30 44 9 0.77 - 55 0 0 -32 13 0 13 18 26.8 4 125 41 -32 57 55 -31 28 42 -33 2 16 -31 24 28 0.78 - 54 0 0 -32 53 47 13 18 27.4 6 124 41 -33 38 55 -32 9 16 -33 43 18 -32 5 0 0.79 - 53 0 0 -33 34 46 13 18 28.2 7 124 41 -34 20 8 -32 50 2 -34 24 32 -32 45 45 0.80 - 52 0 0 -34 15 56 13 18 29.1 8 123 41 -35 1 31 -33 30 59 -35 5 56 -33 26 41 0.80 - 51 0 0 -34 57 14 13 18 30.1 9 123 41 -35 43 2 -34 12 5 -35 47 28 -34 7 46 0.81 - 50 0 0 -35 38 39 13 18 31.3 10 122 41 -36 24 39 -34 53 18 -36 29 7 -34 48 58 0.81 - 49 0 0 -36 20 10 13 18 32.5 11 121 41 -37 6 22 -35 34 37 -37 10 51 -35 30 16 0.81 - 48 0 0 -37 1 43 13 18 33.9 12 121 41 -37 48 7 -36 15 59 -37 52 37 -36 11 37 0.81 - 47 0 0 -37 43 18 13 18 35.5 13 120 41 -38 29 52 -36 57 23 -38 34 24 -36 53 0 0.81 - 46 0 0 -38 24 52 13 18 37.1 14 119 41 -39 11 37 -37 38 47 -39 16 9 -37 34 23 0.82 - 45 0 0 -39 6 24 13 18 38.9 15 119 41 -39 53 19 -38 20 10 -39 57 52 -38 15 45 0.82 - 44 0 0 -39 47 51 13 18 40.7 16 118 41 -40 34 55 -39 1 28 -40 39 30 -38 57 2 0.82 - 43 0 0 -40 29 12 13 18 42.7 17 117 41 -41 16 25 -39 42 40 -41 21 0 -39 38 14 0.82 - 42 0 0 -41 10 25 13 18 44.7 18 116 40 -41 57 46 -40 23 45 -42 2 22 -40 19 18 0.82 - 41 0 0 -41 51 27 13 18 46.9 19 116 40 -42 38 56 -41 4 41 -42 43 33 -41 0 13 0.82 - 40 0 0 -42 32 18 13 18 49.2 20 115 40 -43 19 54 -41 45 25 -43 24 31 -41 40 56 0.82 - 39 0 0 -43 12 55 13 18 51.5 21 114 40 -44 0 37 -42 25 56 -44 5 15 -42 21 27 0.82 - 38 0 0 -43 53 17 13 18 53.9 22 113 39 -44 41 4 -43 6 13 -44 45 42 -43 1 43 0.82 - 37 0 0 -44 33 21 13 18 56.4 23 112 39 -45 21 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0 -56 3 45 13 25 11.9 29 256 -35 -56 50 27 -55 17 44 -56 54 59 -55 13 20 0.84 134 0 0 -55 33 37 13 25 14.3 28 255 -36 -56 20 29 -54 47 26 -56 25 2 -54 43 1 0.84 135 0 0 -55 2 52 13 25 16.8 28 254 -36 -55 49 53 -54 16 32 -55 54 27 -54 12 7 0.84 136 0 0 -54 31 31 13 25 19.2 27 253 -37 -55 18 41 -53 45 3 -55 23 16 -53 40 36 0.84 137 0 0 -53 59 33 13 25 21.5 26 252 -38 -54 46 51 -53 12 57 -54 51 27 -53 8 30 0.84 138 0 0 -53 27 0 13 25 23.9 26 251 -39 -54 14 25 -52 40 16 -54 19 2 -52 35 49 0.84 139 0 0 -52 53 51 13 25 26.2 25 250 -39 -53 41 23 -52 7 1 -53 46 0 -52 2 33 0.85 140 0 0 -52 20 7 13 25 28.5 24 249 -40 -53 7 46 -51 33 12 -53 12 24 -51 28 43 0.85 141 0 0 -51 45 50 13 25 30.8 23 248 -41 -52 33 34 -50 58 49 -52 38 12 -50 54 20 0.85 142 0 0 -51 10 59 13 25 33.0 22 247 -42 -51 58 47 -50 23 54 -52 3 26 -50 19 24 0.85 143 0 0 -50 35 36 13 25 35.2 22 246 -42 -51 23 28 -49 48 27 -51 28 7 -49 43 57 0.85 144 0 0 -49 59 41 13 25 37.3 21 245 -43 -50 47 36 -49 12 29 -50 52 15 -49 7 59 0.85 145 0 0 -49 23 16 13 25 39.4 20 244 -44 -50 11 13 -48 36 2 -50 15 52 -48 31 31 0.85 146 0 0 -48 46 21 13 25 41.4 19 244 -45 -49 34 20 -47 59 6 -49 38 59 -47 54 35 0.86 147 0 0 -48 8 58 13 25 43.3 18 243 -45 -48 56 57 -47 21 42 -49 1 37 -47 17 11 0.86 148 0 0 -47 31 8 13 25 45.2 17 242 -46 -48 19 7 -46 43 53 -48 23 47 -46 39 22 0.86 149 0 0 -46 52 52 13 25 47.0 16 241 -47 -47 40 50 -46 5 38 -47 45 30 -46 1 7 0.86 150 0 0 -46 14 13 13 25 48.8 15 240 -48 -47 2 9 -45 27 0 -47 6 48 -45 22 30 0.87 151 0 0 -45 35 10 13 25 50.4 15 240 -49 -46 23 4 -44 48 0 -46 27 43 -44 43 30 0.87 152 0 0 -44 55 47 13 25 52.0 14 239 -49 -45 43 37 -44 8 40 -45 48 15 -44 4 10 0.87 153 0 0 -44 16 3 13 25 53.5 13 238 -50 -45 3 49 -43 29 1 -45 8 27 -43 24 31 0.88 154 0 0 -43 36 2 13 25 54.9 12 237 -51 -44 23 43 -42 49 4 -44 28 21 -42 44 35 0.88 155 0 0 -42 55 45 13 25 56.2 11 237 -52 -43 43 20 -42 8 53 -43 47 57 -42 4 24 0.89 156 0 0 -42 15 13 13 25 57.4 10 236 -52 -43 2 41 -41 28 27 -43 7 18 -41 23 59 0.90 157 0 0 -41 34 28 13 25 58.5 9 235 -53 -42 21 49 -40 47 49 -42 26 25 -40 43 22 0.91 158 0 0 -40 53 33 13 25 59.4 8 235 -54 -41 40 46 -40 7 1 -41 45 21 -40 2 35 0.92 159 0 0 -40 12 28 13 26 0.3 7 234 -54 -40 59 33 -39 26 5 -41 4 7 -39 21 39 0.93 160 0 0 -39 31 17 13 26 1.0 6 233 -55 -40 18 12 -38 45 2 -40 22 46 -38 40 37 0.95 161 0 0 -38 49 59 13 26 1.7 5 233 -56 -39 36 46 -38 3 54 -39 41 18 -37 59 30 0.98 162 0 0 -38 8 39 13 26 2.2 4 232 -56 -38 55 15 -37 22 44 -38 59 46 -37 18 20 1.02 163 0 0 -37 27 17 13 26 2.5 2 231 -57 -38 13 42 -36 41 32 -38 18 12 -36 37 9 1.11 164 0 0 -36 45 55 13 26 2.8 1 231 -57 -37 32 9 -36 0 21 -37 36 38 -35 55 59 1.31 165 0 0 -36 4 35 13 26 2.9 0 230 -58 -36 50 37 .. .. .. -36 55 5 .. .. .. 2.71 Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: TYC 7329-01656-1 * constellation : Lupus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 02 39.1683 DE: -31 29 16.410 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 02 39.1681 DE: -31 29 16.410 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (250) Bettina asteroid class: approx. diameter [km]: 99 approx. diameter ["]: 0.038 distance from Earth [AU]: 3.63680 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#66 date of fit: 2023 Aug 22 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", 0.001", 112.073° remarks: * orbital elements for (250)Bettina : Mean anomaly = 157.0258802375 deg Arg. of pericenter = 75.7461673518 deg Long. of node = 23.8081671321 deg Inclination = 12.8197371888 deg Eccentricity = 0.1363095404 Semimajor axis = 3.1438372683 AU Perihelion dist = 2.7153022553 AU Mag: H = 7.73, G = 0.15 Epoch of elements : MJD 60198.55708333 TDT (2023 Sep 11.5571) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#662023Aug22,4.58,2023,9,11,13.370707,-0.043511,-0.628900,12.170278,-0.856588,0.005519,-0.001355,0.000000,0.000000 50.1646,-31.5546,-21.38,4.52,False TYC 7329-01656-1,16.04421344,-31.4878919,0.00,10.71,0.00,0.0,0,,16.06884598,-31.5545837,3.31,0.00,0,0,0 250,Bettina,13.97,99.100,3.6368,0,0,2.303,-2.07,,5.2,0 0,156.9274,2023,9,11,75.7462,23.8082,12.8197,0.13631,3.14384,2.71530,7.55,5.0,0.15 1.048,0.0053,0.0008,112,0.0054,Known errors,-1.00,0,-1,-1 20230911_1656-1,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org