IOTA/IOTA-ES occultation update for (102) Miriam / TYC 5544-00779-1 event on 2023 Aug 02, 10:46 UT Visible from Australia Summary ------- On 2023 Aug 02 UT, the 84.6 km diameter asteroid (102) Miriam will occult a 9.1 mag star in the constellation Virgo for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.24 mag to 15.30 mag (the magnitude of the asteroid) for at most 3.730 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 02, 10:41 - 2023 Aug 02, 10:51 * geocentric midpoint of event [JD]: 2460158.94908534 * magnitude of target star: 9.06 * magnitude drop [mag]: 6.24 * estimated maximum duration [s]: 3.730 * Moon: 99 % sunlit, 117° distance * Sun: 72° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 85 * 1 sigma uncertainty interval [path widths]: +/- 0.01 * 1 sigma uncertainty interval [seconds]: +/- 0.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.005, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.005", 0.000", 111°) * approx speed of asteroid's shadow [km/s]: 22.6916 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5544-00779-1 by 102 Miriam on 2023 Aug 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 11 34 1 10 42 2.3 1 98 70 11 10 36 11 57 23 11 9 57 11 58 2 .... 3 0 0 11 25 10 10 42 2.4 2 98 71 11 1 45 11 48 34 11 1 6 11 49 13 0.13 4 0 0 11 15 58 10 42 2.6 3 99 72 10 52 32 11 39 24 10 51 53 11 40 3 0.13 5 0 0 11 6 26 10 42 2.9 4 99 73 10 42 58 11 29 52 10 42 18 11 30 31 0.13 6 0 0 10 56 32 10 42 3.3 5 99 74 10 33 2 11 20 0 10 32 23 11 20 39 0.13 7 0 0 10 46 17 10 42 3.7 6 99 75 10 22 46 11 9 46 10 22 7 11 10 25 0.13 8 0 0 10 35 41 10 42 4.3 7 99 75 10 12 8 10 59 12 10 11 29 10 59 51 0.13 9 0 0 10 24 44 10 42 4.9 8 100 76 10 1 10 10 48 16 10 0 31 10 48 56 0.13 10 0 0 10 13 26 10 42 5.6 9 100 77 9 49 51 10 37 0 9 49 12 10 37 40 0.14 11 0 0 10 1 48 10 42 6.4 10 100 77 9 38 11 10 25 24 9 37 32 10 26 3 0.14 12 0 0 9 49 49 10 42 7.3 11 100 78 9 26 11 10 13 26 9 25 31 10 14 6 0.14 13 0 0 9 37 30 10 42 8.3 12 100 79 9 13 50 10 1 9 9 13 10 10 1 48 0.14 14 0 0 9 24 50 10 42 9.4 13 100 79 9 1 8 9 48 30 9 0 29 9 49 10 0.14 15 0 0 9 11 50 10 42 10.6 14 101 80 8 48 7 9 35 32 8 47 27 9 36 12 0.14 16 0 0 8 58 30 10 42 11.8 15 101 80 8 34 45 9 22 14 8 34 6 9 22 53 0.14 17 0 0 8 44 50 10 42 13.2 16 101 80 8 21 4 9 8 36 8 20 24 9 9 15 0.14 18 0 0 8 30 51 10 42 14.6 17 101 80 8 7 2 8 54 38 8 6 22 8 55 17 0.14 19 0 0 8 16 31 10 42 16.1 18 101 80 7 52 41 8 40 20 7 52 1 8 41 0 0.14 20 0 0 8 1 53 10 42 17.7 19 101 80 7 38 1 8 25 43 7 37 21 8 26 23 0.14 21 0 0 7 46 55 10 42 19.4 20 101 80 7 23 1 8 10 47 7 22 21 8 11 27 0.14 22 0 0 7 31 38 10 42 21.2 21 101 80 7 7 42 7 55 32 7 7 2 7 56 12 0.14 23 0 0 7 16 2 10 42 23.1 22 102 79 6 52 4 7 39 58 6 51 25 7 40 38 0.14 24 0 0 7 0 7 10 42 25.1 23 102 79 6 36 8 7 24 5 6 35 28 7 24 45 0.14 25 0 0 6 43 55 10 42 27.1 24 102 78 6 19 53 7 7 54 6 19 13 7 8 34 0.14 26 0 0 6 27 23 10 42 29.3 25 102 78 6 3 20 6 51 25 6 2 40 6 52 5 0.14 27 0 0 6 10 34 10 42 31.5 26 102 77 5 46 30 6 34 38 5 45 49 6 35 18 0.14 28 0 0 5 53 28 10 42 33.8 27 102 76 5 29 21 6 17 33 5 28 41 6 18 13 0.14 29 0 0 5 36 3 10 42 36.2 28 102 75 5 11 55 6 0 10 5 11 15 6 0 51 0.14 30 0 0 5 18 22 10 42 38.7 29 102 75 4 54 12 5 42 31 4 53 32 5 43 11 0.14 31 0 0 5 0 24 10 42 41.3 30 102 74 4 36 12 5 24 35 4 35 32 5 25 15 0.14 32 0 0 4 42 9 10 42 44.0 31 102 73 4 17 55 5 6 22 4 17 15 5 7 2 0.14 33 0 0 4 23 38 10 42 46.8 33 102 72 3 59 23 4 47 52 3 58 42 4 48 33 0.14 34 0 0 4 4 51 10 42 49.6 34 102 71 3 40 34 4 29 7 3 39 53 4 29 48 0.14 35 0 0 3 45 49 10 42 52.5 35 102 70 3 21 30 4 10 6 3 20 49 4 10 47 0.14 36 0 0 3 26 31 10 42 55.6 36 102 69 3 2 10 3 50 50 3 1 30 3 51 31 0.14 37 0 0 3 6 58 10 42 58.7 37 102 68 2 42 36 3 31 20 2 41 55 3 32 0 0.14 38 0 0 2 47 11 10 43 1.9 38 102 67 2 22 47 3 11 34 2 22 6 3 12 15 0.14 39 0 0 2 27 10 10 43 5.1 39 102 66 2 2 44 2 51 34 2 2 3 2 52 15 0.14 40 0 0 2 6 55 10 43 8.5 40 102 65 1 42 27 2 31 21 1 41 47 2 32 2 0.14 41 0 0 1 46 27 10 43 11.9 41 102 65 1 21 57 2 10 54 1 21 17 2 11 35 0.14 42 0 0 1 25 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44 0.13 129 0 0 -26 21 1 10 49 50.5 47 287 -25 -26 44 27 -25 57 36 -26 45 6 -25 56 57 0.13 130 0 0 -26 29 52 10 49 53.7 46 287 -26 -26 53 17 -26 6 29 -26 53 56 -26 5 50 0.13 131 0 0 -26 38 24 10 49 57.0 45 286 -27 -27 1 47 -26 15 1 -27 2 26 -26 14 22 0.13 132 0 0 -26 46 35 10 50 0.1 44 286 -28 -27 9 57 -26 23 14 -27 10 36 -26 22 35 0.13 133 0 0 -26 54 26 10 50 3.2 43 285 -29 -27 17 47 -26 31 6 -27 18 26 -26 30 27 0.13 134 0 0 -27 1 56 10 50 6.3 42 284 -30 -27 25 16 -26 38 38 -27 25 55 -26 37 59 0.13 135 0 0 -27 9 7 10 50 9.3 41 284 -31 -27 32 26 -26 45 49 -27 33 5 -26 45 11 0.13 136 0 0 -27 15 57 10 50 12.2 40 283 -32 -27 39 15 -26 52 41 -27 39 54 -26 52 2 0.13 137 0 0 -27 22 27 10 50 15.1 39 283 -32 -27 45 44 -26 59 12 -27 46 23 -26 58 33 0.13 138 0 0 -27 28 37 10 50 17.9 38 282 -33 -27 51 53 -27 5 23 -27 52 32 -27 4 44 0.13 139 0 0 -27 34 27 10 50 20.6 38 282 -34 -27 57 42 -27 11 13 -27 58 20 -27 10 35 0.13 140 0 0 -27 39 56 10 50 23.3 37 281 -35 -28 3 10 -27 16 44 -28 3 49 -27 16 5 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-27 46 55 0.14 165 0 0 -28 7 48 10 51 10.5 14 269 -57 -28 30 57 -27 44 39 -28 31 36 -27 44 1 0.14 166 0 0 -28 4 33 10 51 11.5 14 268 -58 -28 27 43 -27 41 24 -28 28 22 -27 40 46 0.14 167 0 0 -28 0 59 10 51 12.5 13 268 -59 -28 24 10 -27 37 50 -28 24 49 -27 37 11 0.14 168 0 0 -27 57 5 10 51 13.4 12 267 -60 -28 20 17 -27 33 55 -28 20 55 -27 33 17 0.14 169 0 0 -27 52 52 10 51 14.3 11 267 -61 -28 16 4 -27 29 41 -28 16 42 -27 29 2 0.14 170 0 0 -27 48 18 10 51 15.1 10 266 -62 -28 11 31 -27 25 6 -28 12 9 -27 24 28 0.14 171 0 0 -27 43 24 10 51 15.8 9 266 -63 -28 6 38 -27 20 12 -28 7 17 -27 19 33 0.14 172 0 0 -27 38 11 10 51 16.5 8 265 -63 -28 1 26 -27 14 58 -28 2 4 -27 14 19 0.14 173 0 0 -27 32 38 10 51 17.1 7 265 -64 -27 55 54 -27 9 24 -27 56 32 -27 8 45 0.15 174 0 0 -27 26 46 10 51 17.6 6 264 -65 -27 50 2 -27 3 30 -27 50 41 -27 2 52 0.15 175 0 0 -27 20 33 10 51 18.1 5 264 -66 -27 43 51 -26 57 17 -27 44 29 -26 56 38 0.15 176 0 0 -27 14 1 10 51 18.5 5 264 -67 -27 37 20 -26 50 44 -27 37 59 -26 50 5 0.16 177 0 0 -27 7 10 10 51 18.8 4 263 -68 -27 30 29 -26 43 52 -27 31 8 -26 43 13 0.16 178 0 0 -26 59 59 10 51 19.1 3 263 -69 -27 23 19 -26 36 39 -27 23 58 -26 36 0 0.17 179 0 0 -26 52 28 10 51 19.2 2 262 -70 -27 15 50 -26 29 8 -27 16 29 -26 28 29 0.19 180 0 0 -26 44 38 10 51 19.4 1 262 -70 -27 8 1 -26 21 16 -27 8 40 -26 20 37 0.25 -179 0 0 -26 36 29 10 51 19.4 0 261 -71 -26 59 53 -26 13 6 -27 0 32 -26 12 27 1.49 Uncertainty in time = +/- 1 secs Prediction of 2023 Jun 15.2 Data for the target star ------------------------ * name: TYC 5544-00779-1 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 13 21 49.8866 DE: -07 44 47.702 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 13 21 49.8864 DE: -07 44 47.702 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (102) Miriam asteroid class: approx. diameter [km]: 85 approx. diameter ["]: 0.036 distance from Earth [AU]: 3.21910 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#110 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): 0.005", 0.000", 110.579° remarks: * orbital elements for (102)Miriam : Mean anomaly = 244.4939123176 deg Arg. of pericenter = 147.2549439287 deg Long. of node = 210.7657900097 deg Inclination = 5.1741640915 deg Eccentricity = 0.2509748419 Semimajor axis = 2.6632066737 AU Perihelion dist = 1.9948087999 AU Mag: H = 9.38, G = 0.15 Epoch of elements : MJD 60158.44909722 TDT (2023 Aug 02.4491) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1102023Apr24,3.73,2023,8,2,10.778048,-0.042692,-0.123139,12.093976,-4.215963,0.004961,-0.001959,0.000000,0.000000 88.3168,-7.8688,19.91,17.76,False TYC 5544-00779-1,13.36385740,-7.7465842,0.00,9.06,0.00,0.0,0,,13.38418251,-7.8688401,6.24,0.00,0,0,0 102,Miriam,15.30,84.600,3.2191,0,0,2.224,-11.52,,4.8,0 0,244.3921,2023,8,2,147.2549,210.7658,5.1742,0.25097,2.66321,1.99481,9.38,5.0,0.15 1.014,0.0053,0.0005,111,0.0005,Known errors,-1.00,-1,-1,-1 20230802_0779-1,60110.21 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jun 15, 05:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org