IOTA/IOTA-ES occultation update for (91) Aegina / UCAC4 332-079409 event on 2023 Jun 19, 14:40 UT Visible from Australia Summary ------- On 2023 Jun 19 UT, the 107.4 km diameter asteroid (91) Aegina will occult a 12.0 mag star in the constellation Scorpius 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 1.50 mag to 13.19 mag (the magnitude of the asteroid) for at most 10.320 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 19, 14:30 - 2023 Jun 19, 14:50 * geocentric midpoint of event [JD]: 2460115.11146329 * magnitude of target star: 12.00 * magnitude drop [mag]: 1.50 * estimated maximum duration [s]: 10.320 * Moon: 2 % sunlit, 141° distance * Sun: 156° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 108 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 3.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.017) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.016", 102°) * approx speed of asteroid's shadow [km/s]: 10.4033 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 332-079409 by 91 Aegina on 2023 Jun 19 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 25 0 0 7 1 3 14 50 42.1 0 114 24 .. .. .. 6 29 7 .. .. .. 6 16 0 .... 26 0 0 6 34 14 14 50 42.0 1 114 22 7 6 12 6 2 14 7 19 19 5 49 6 0.16 27 0 0 6 7 10 14 50 41.7 2 114 21 6 39 11 5 35 8 6 52 19 5 21 59 0.10 28 0 0 5 39 52 14 50 41.2 3 114 20 6 11 55 5 7 48 6 25 4 4 54 38 0.09 29 0 0 5 12 21 14 50 40.4 4 114 19 5 44 27 4 40 15 5 57 37 4 27 3 0.08 30 0 0 4 44 38 14 50 39.4 5 115 18 5 16 46 4 12 29 5 29 57 3 59 17 0.07 31 0 0 4 16 43 14 50 38.2 7 115 17 4 48 53 3 44 32 5 2 5 3 31 19 0.07 32 0 0 3 48 38 14 50 36.7 8 115 16 4 20 50 3 16 25 4 34 2 3 3 11 0.07 33 0 0 3 20 22 14 50 35.0 9 115 15 3 52 35 2 48 7 4 5 49 2 34 52 0.07 34 0 0 2 51 56 14 50 33.1 10 115 14 3 24 12 2 19 39 3 37 26 2 6 24 0.06 35 0 0 2 23 22 14 50 31.0 11 115 13 2 55 39 1 51 3 3 8 54 1 37 47 0.06 36 0 0 1 54 39 14 50 28.7 12 115 12 2 26 58 1 22 19 2 40 13 1 9 3 0.06 37 0 0 1 25 49 14 50 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43 25 14 30 52.4 19 251 -42 -21 12 25 -22 14 27 -20 59 41 -22 27 12 0.06 -164 0 0 -21 22 49 14 30 49.0 18 251 -41 -20 51 45 -21 53 54 -20 39 0 -22 6 40 0.06 -163 0 0 -21 1 50 14 30 45.9 17 250 -40 -20 30 42 -21 32 59 -20 17 55 -21 45 46 0.07 -162 0 0 -20 40 28 14 30 42.9 16 250 -39 -20 9 16 -21 11 40 -19 56 28 -21 24 29 0.07 -161 0 0 -20 18 43 14 30 40.0 15 250 -38 -19 47 28 -20 49 59 -19 34 38 -21 2 50 0.07 -160 0 0 -19 56 36 14 30 37.3 14 249 -37 -19 25 17 -20 27 56 -19 12 26 -20 40 48 0.07 -159 0 0 -19 34 7 14 30 34.8 13 249 -36 -19 2 44 -20 5 30 -18 49 52 -20 18 24 0.07 -158 0 0 -19 11 16 14 30 32.5 12 249 -35 -18 39 49 -19 42 43 -18 26 56 -19 55 38 0.07 -157 0 0 -18 48 3 14 30 30.3 11 248 -34 -18 16 33 -19 19 34 -18 3 38 -19 32 30 0.07 -156 0 0 -18 24 29 14 30 28.4 10 248 -33 -17 52 55 -18 56 3 -17 39 58 -19 9 1 0.07 -155 0 0 -18 0 33 14 30 26.6 9 248 -32 -17 28 56 -18 32 11 -17 15 58 -18 45 10 0.07 -154 0 0 -17 36 17 14 30 25.0 8 247 -31 -17 4 37 -18 7 58 -16 51 37 -18 20 59 0.07 -153 0 0 -17 11 40 14 30 23.5 7 247 -30 -16 39 56 -17 43 25 -16 26 55 -17 56 27 0.08 -152 0 0 -16 46 43 14 30 22.3 6 247 -29 -16 14 56 -17 18 31 -16 1 54 -17 31 35 0.08 -151 0 0 -16 21 26 14 30 21.3 5 247 -28 -15 49 36 -16 53 18 -15 36 32 -17 6 22 0.09 -150 0 0 -15 55 50 14 30 20.4 4 246 -27 -15 23 56 -16 27 45 -15 10 51 -16 40 51 0.10 -149 0 0 -15 29 55 14 30 19.8 3 246 -26 -14 57 58 -16 1 53 -14 44 51 -16 15 0 0.12 -148 0 0 -15 3 41 14 30 19.4 2 246 -25 -14 31 41 -15 35 42 -14 18 33 -15 48 51 0.16 -147 0 0 -14 37 9 14 30 19.2 1 245 -24 -14 5 6 -15 9 13 -13 51 57 -15 22 23 0.39 Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 332-079409 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 07 10.8293 DE: -23 45 37.004 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 07 10.8292 DE: -23 45 37.004 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (91) Aegina asteroid class: approx. diameter [km]: 107 approx. diameter ["]: 0.078 distance from Earth [AU]: 1.89910 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#141 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): 0.026", 0.016", 102.082° remarks: * orbital elements for (91)Aegina : Mean anomaly = 164.8375525385 deg Arg. of pericenter = 74.3653960251 deg Long. of node = 10.4338025538 deg Inclination = 2.1030172694 deg Eccentricity = 0.1072103284 Semimajor axis = 2.5896887530 AU Perihelion dist = 2.3120473714 AU Mag: H = 8.94, G = 0.15 Epoch of elements : MJD 60114.61152778 TDT (2023 Jun 19.6115) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1412023Apr24,10.32,2023,6,19,14.675119,-0.013971,-0.068814,-5.750886,1.185960,0.002242,-0.000172,0.000001,0.000000 114.4561,-23.8240,-39.78,23.42,False UCAC4 332-079409,16.11967480,-23.7602789,0.00,12.00,0.00,0.0,0,,16.14327359,-23.8240371,1.51,0.00,0,0,0 91,Aegina,13.19,107.4,1.8991,0,0,-1.939,5.49,,5.4,0 0,164.6929,2023,6,19,74.3654,10.4338,2.1030,0.10721,2.58969,2.31205,8.95,5.0,0.15 1.205,0.0260,0.0160,102,0.0160,Known errors,-1.00,-1,-1,-1 20230619_079409,60063.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org