IOTA/IOTA-ES occultation update for (250) Bettina / UCAC4 284-084164 event on 2023 Jun 06, 03:47 UT Visible from E USA Summary ------- On 2023 Jun 06 UT, the 99.1 km diameter asteroid (250) Bettina will occult a 12.4 mag star in the constellation Lupus for observers along a path across E USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.88 mag to 12.69 mag (the magnitude of the asteroid) for at most 7.000 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: 2023 Jun 06, 03:44 - 2023 Jun 06, 03:50 * geocentric midpoint of event [JD]: 2460101.65772104 * magnitude of target star: 12.44 * magnitude drop [mag]: 0.88 * estimated maximum duration [s]: 7.000 * Moon: 95 % sunlit, 37° distance * Sun: 164° distance * rough path description: E USA Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 304 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.009) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.003", 114°) * approx speed of asteroid's shadow [km/s]: 14.1554 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 284-084164 by 250 Bettina on 2023 Jun 6 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 - 96 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 53 32 36 .... - 95 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 52 57 12 .. .. .. 52 8 41 .... - 94 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 51 37 16 .. .. .. 50 54 4 .... - 93 0 0 53 39 11 3 49 30.9 1 162 -8 .. .. .. 50 25 47 .. .. .. 49 46 24 .... - 92 0 0 52 13 3 3 49 29.7 3 163 -10 .. .. .. 49 20 42 .. .. .. 48 44 15 -1.95 - 91 0 0 50 58 7 3 49 27.7 4 164 -11 54 47 0 48 20 48 .. .. .. 47 46 39 -2.37 - 90 0 0 49 51 8 3 49 25.2 5 165 -12 53 7 29 47 25 14 54 14 40 46 52 59 -2.56 - 89 0 0 48 50 17 3 49 22.2 7 165 -13 51 45 43 46 33 25 52 41 19 46 2 44 -2.66 - 88 0 0 47 54 24 3 49 18.9 8 166 -15 50 34 53 45 44 55 51 23 31 45 15 34 -2.73 - 87 0 0 47 2 43 3 49 15.2 9 167 -16 49 31 50 44 59 23 50 15 43 44 31 11 -2.77 - 86 0 0 46 14 41 3 49 11.2 9 168 -17 48 34 47 44 16 33 49 15 10 43 49 21 -2.81 - 85 0 0 45 29 52 3 49 7.0 10 169 -18 47 42 39 43 36 13 48 20 18 43 9 54 -2.83 - 84 0 0 44 47 59 3 49 2.5 11 169 -19 46 54 38 42 58 13 47 30 8 42 32 40 -2.85 - 83 0 0 44 8 44 3 48 57.9 12 170 -19 46 10 14 42 22 23 46 43 57 41 57 31 -2.86 - 82 0 0 43 31 58 3 48 53.0 13 171 -20 45 29 2 41 48 37 46 1 16 41 24 22 -2.87 - 81 0 0 42 57 29 3 48 48.0 13 172 -21 44 50 43 41 16 48 45 21 41 40 53 6 -2.88 - 80 0 0 42 25 10 3 48 42.8 14 173 -22 44 15 2 40 46 51 44 44 55 40 23 39 -2.89 - 79 0 0 41 54 53 3 48 37.5 15 173 -23 43 41 49 40 18 42 44 10 46 39 55 56 -2.90 - 78 0 0 41 26 33 3 48 32.1 15 174 -23 43 10 52 39 52 16 43 39 0 39 29 55 -2.90 - 77 0 0 41 0 5 3 48 26.6 16 175 -24 42 42 5 39 27 31 43 9 31 39 5 32 -2.91 - 76 0 0 40 35 25 3 48 20.9 16 176 -25 42 15 21 39 4 23 42 42 8 38 42 43 -2.91 - 75 0 0 40 12 28 3 48 15.2 17 177 -25 41 50 34 38 42 50 42 16 48 38 21 28 -2.91 - 74 0 0 39 51 11 3 48 9.4 17 178 -26 41 27 40 38 22 49 41 53 24 38 1 43 -2.92 - 73 0 0 39 31 33 3 48 3.5 17 178 -26 41 6 34 38 4 18 41 31 52 37 43 27 -2.92 - 72 0 0 39 13 30 3 47 57.6 18 179 -27 40 47 13 37 47 15 41 12 8 37 26 37 -2.92 - 71 0 0 38 57 0 3 47 51.6 18 180 -27 40 29 34 37 31 39 40 54 8 37 11 12 -2.92 - 70 0 0 38 42 1 3 47 45.6 18 181 -28 40 13 34 37 17 28 40 37 50 36 57 12 -2.93 - 69 0 0 38 28 32 3 47 39.5 18 182 -28 39 59 11 37 4 41 40 23 11 36 44 34 -2.93 - 68 0 0 38 16 31 3 47 33.4 18 183 -28 39 46 24 36 53 17 40 10 9 36 33 19 -2.93 - 67 0 0 38 5 57 3 47 27.3 19 184 -29 39 35 9 36 43 15 39 58 43 36 23 24 -2.93 - 66 0 0 37 56 49 3 47 21.2 19 184 -29 39 25 27 36 34 34 39 48 51 36 14 49 -2.93 - 65 0 0 37 49 6 3 47 15.1 19 185 -29 39 17 15 36 27 14 39 40 31 36 7 34 -2.94 - 64 0 0 37 42 47 3 47 9.0 19 186 -29 39 10 34 36 21 13 39 33 42 36 1 37 -2.94 - 63 0 0 37 37 52 3 47 2.9 19 187 -30 39 5 21 36 16 33 39 28 25 35 57 0 -2.94 - 62 0 0 37 34 21 3 46 56.8 19 188 -30 39 1 37 36 13 11 39 24 37 35 53 41 -2.94 - 61 0 0 37 32 12 3 46 50.7 19 189 -30 38 59 22 36 11 9 39 22 20 35 51 39 -2.95 - 60 0 0 37 31 27 3 46 44.7 19 190 -30 38 58 34 36 10 25 39 21 32 35 50 56 -2.95 - 59 0 0 37 32 5 3 46 38.7 18 190 -30 38 59 15 36 11 0 39 22 13 35 51 31 -2.95 - 58 0 0 37 34 5 3 46 32.7 18 191 -30 39 1 24 36 12 55 39 24 24 35 53 24 -2.95 - 57 0 0 37 37 29 3 46 26.8 18 192 -30 39 5 1 36 16 8 39 28 5 35 56 34 -2.96 - 56 0 0 37 42 17 3 46 21.0 18 193 -30 39 10 6 36 20 40 39 33 16 36 1 4 -2.96 - 55 0 0 37 48 28 3 46 15.3 17 194 -30 39 16 42 36 26 33 39 39 58 36 6 52 -2.96 - 54 0 0 37 56 4 3 46 9.6 17 195 -30 39 24 47 36 33 46 39 48 13 36 14 0 -2.97 - 53 0 0 38 5 6 3 46 4.0 17 195 -29 39 34 24 36 42 19 39 58 0 36 22 27 -2.97 - 52 0 0 38 15 34 3 45 58.4 16 196 -29 39 45 34 36 52 15 40 9 22 36 32 15 -2.98 - 51 0 0 38 27 30 3 45 53.0 16 197 -29 39 58 18 37 3 32 40 22 20 36 43 25 -2.98 - 50 0 0 38 40 55 3 45 47.7 16 198 -29 40 12 38 37 16 14 40 36 56 36 55 57 -2.99 - 49 0 0 38 55 50 3 45 42.5 15 199 -28 40 28 35 37 30 20 40 53 12 37 9 52 -2.99 - 48 0 0 39 12 18 3 45 37.5 15 199 -28 40 46 13 37 45 53 41 11 11 37 25 13 -3.00 - 47 0 0 39 30 19 3 45 32.5 14 200 -27 41 5 34 38 2 53 41 30 55 37 41 59 -3.00 - 46 0 0 39 49 57 3 45 27.8 14 201 -27 41 26 41 38 21 22 41 52 29 38 0 14 -3.01 - 45 0 0 40 11 14 3 45 23.1 13 202 -26 41 49 38 38 41 22 42 15 56 38 19 58 -3.02 - 44 0 0 40 34 13 3 45 18.7 12 202 -26 42 14 28 39 2 56 42 41 21 38 41 13 -3.02 - 43 0 0 40 58 57 3 45 14.4 12 203 -25 42 41 18 39 26 6 43 8 50 39 4 3 -3.03 - 42 0 0 41 25 30 3 45 10.3 11 204 -25 43 10 13 39 50 54 43 38 28 39 28 29 -3.04 - 41 0 0 41 53 57 3 45 6.4 10 205 -24 43 41 20 40 17 24 44 10 25 39 54 34 -3.05 - 40 0 0 42 24 23 3 45 2.7 9 205 -23 44 14 46 40 45 40 44 44 49 40 22 23 -3.06 - 39 0 0 42 56 53 3 44 59.3 9 206 -23 44 50 43 41 15 45 45 21 53 40 51 57 -3.08 - 38 0 0 43 31 36 3 44 56.1 8 207 -22 45 29 22 41 47 44 46 1 50 41 23 23 -3.10 - 37 0 0 44 8 40 3 44 53.2 7 208 -21 46 10 59 42 21 44 46 44 58 41 56 45 -3.12 - 36 0 0 44 48 15 3 44 50.6 6 208 -20 46 55 54 42 57 49 47 31 43 42 32 8 -3.14 - 35 0 0 45 30 34 3 44 48.3 5 209 -19 47 44 31 43 36 8 48 22 35 43 9 40 -3.18 - 34 0 0 46 15 52 3 44 46.4 4 210 -18 48 37 25 44 16 50 49 18 18 43 49 28 -3.24 - 33 0 0 47 4 31 3 44 44.9 3 211 -17 49 35 25 45 0 6 50 20 0 44 31 42 -3.35 - 32 0 0 47 56 56 3 44 43.8 2 211 -16 .. .. .. 45 46 10 .. .. .. 45 16 34 -3.58 - 31 0 0 48 53 42 3 44 43.2 1 212 -15 .. .. .. 46 35 17 .. .. .. 46 4 19 -4.55 - 30 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 47 27 49 .. .. .. 46 55 13 .... - 29 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 48 24 15 .. .. .. 47 49 41 .... Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 284-084164 * constellation : Lupus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 59 02.6330 DE: -33 17 50.312 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 59 02.6328 DE: -33 17 50.314 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.700,0.500) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (250) Bettina asteroid class: approx. diameter [km]: 99 approx. diameter ["]: 0.055 distance from Earth [AU]: 2.50640 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#64 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): 0.020", 0.003", 113.669° remarks: * orbital elements for (250)Bettina : Mean anomaly = 139.7915384754 deg Arg. of pericenter = 75.7635619571 deg Long. of node = 23.8083257788 deg Inclination = 12.8197638464 deg Eccentricity = 0.1361736650 Semimajor axis = 3.1442268000 AU Perihelion dist = 2.7160659130 AU Mag: H = 7.55, G = 0.15 Epoch of elements : MJD 60101.15770833 TDT (2023 Jun 06.1577) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#642023Apr24,7.00,2023,6,6,3.785305,0.100038,0.940077,-7.945271,0.841251,0.001237,0.000982,0.000001,0.000000 -70.9468,-33.3652,122.88,22.62,False UCAC4 284-084164,15.98406473,-33.2973089,0.00,12.44,0.00,0.0,0,,16.00920961,-33.3651510,0.89,0.00,0,0,0 250,Bettina,12.69,99.1,2.5064,0,0,-2.224,2.95,,5.2,0 0,139.7637,2023,6,6,75.7636,23.8083,12.8198,0.13617,3.14423,2.71607,7.58,5.0,0.15 1.125,0.0200,0.0033,114,0.0068,Known errors,-1.00,-1,-1,-1 20230606_084164,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org