IOTA/IOTA-ES occultation update for (91) Aegina / UCAC4 327-091086 event on 2023 Oct 13, 10:54 UT Visible from SE Australia Summary ------- On 2023 Oct 13 UT, the 107.4 km diameter asteroid (91) Aegina will occult a 11.4 mag star in the constellation Ophiuchus 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 3.35 mag to 14.69 mag (the magnitude of the asteroid) for at most 3.350 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 Oct 13, 10:51 - 2023 Oct 13, 10:58 * geocentric midpoint of event [JD]: 2460230.95473141 * magnitude of target star: 11.39 * magnitude drop [mag]: 3.35 * estimated maximum duration [s]: 3.350 * Moon: 2 % sunlit, 73° distance * Sun: 58° distance * rough path description: SE Australia The occultation path -------------------- * approximate projected width [km]: 114 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 0.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.004, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.004", 0.001", 95°) * approx speed of asteroid's shadow [km/s]: 32.0465 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 327-091086 by 91 Aegina on 2023 Oct 13 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 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. -14 48 1 .. .. .. .... - 24 0 0 -14 40 24 10 51 41.9 1 115 52 -15 14 56 -14 6 1 -15 16 5 -14 4 52 .... - 23 0 0 -15 8 33 10 51 42.0 2 115 53 -15 43 7 -14 34 7 -15 44 16 -14 32 59 0.35 - 22 0 0 -15 36 48 10 51 42.1 3 115 54 -16 11 25 -15 2 20 -16 12 34 -15 1 11 0.36 - 21 0 0 -16 5 9 10 51 42.4 4 115 55 -16 39 47 -15 30 38 -16 40 57 -15 29 30 0.36 - 20 0 0 -16 33 34 10 51 42.7 5 114 56 -17 8 15 -15 59 2 -17 9 24 -15 57 53 0.36 - 19 0 0 -17 2 4 10 51 43.1 6 114 57 -17 36 47 -16 27 30 -17 37 56 -16 26 21 0.36 - 18 0 0 -17 30 37 10 51 43.6 7 114 58 -18 5 22 -16 56 2 -18 6 31 -16 54 53 0.36 - 17 0 0 -17 59 13 10 51 44.1 8 113 58 -18 33 59 -17 24 36 -18 35 9 -17 23 27 0.37 - 16 0 0 -18 27 51 10 51 44.7 9 113 59 -19 2 38 -17 53 12 -19 3 48 -17 52 3 0.37 - 15 0 0 -18 56 30 10 51 45.4 10 113 60 -19 31 18 -18 21 49 -19 32 28 -18 20 41 0.37 - 14 0 0 -19 25 8 10 51 46.1 11 112 61 -19 59 58 -18 50 27 -20 1 8 -18 49 18 0.37 - 13 0 0 -19 53 46 10 51 47.0 13 112 61 -20 28 37 -19 19 4 -20 29 47 -19 17 55 0.37 - 12 0 0 -20 22 23 10 51 47.8 14 112 62 -20 57 14 -19 47 40 -20 58 24 -19 46 31 0.37 - 11 0 0 -20 50 58 10 51 48.8 15 111 63 -21 25 50 -20 16 14 -21 26 59 -20 15 5 0.37 - 10 0 0 -21 19 29 10 51 49.8 16 111 63 -21 54 21 -20 44 45 -21 55 31 -20 43 36 0.37 - 9 0 0 -21 47 57 10 51 50.9 17 110 64 -22 22 49 -21 13 13 -22 23 59 -21 12 4 0.37 - 8 0 0 -22 16 20 10 51 52.0 18 110 65 -22 51 12 -21 41 35 -22 52 22 -21 40 26 0.37 - 7 0 0 -22 44 37 10 51 53.3 19 110 65 -23 19 30 -22 9 53 -23 20 39 -22 8 44 0.37 - 6 0 0 -23 12 49 10 51 54.5 20 109 66 -23 47 41 -22 38 5 -23 48 51 -22 36 56 0.37 - 5 0 0 -23 40 54 10 51 55.9 21 109 66 -24 15 45 -23 6 10 -24 16 55 -23 5 1 0.37 - 4 0 0 -24 8 51 10 51 57.2 22 108 67 -24 43 42 -23 34 8 -24 44 51 -23 32 59 0.37 - 3 0 0 -24 36 39 10 51 58.7 23 108 67 -25 11 30 -24 1 57 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-24 26 6 -23 16 35 -24 27 16 -23 15 26 0.46 168 0 0 -23 23 22 10 57 55.6 3 244 -51 -23 58 13 -22 48 40 -23 59 22 -22 47 31 0.48 169 0 0 -22 55 21 10 57 55.8 2 244 -52 -23 30 12 -22 20 39 -23 31 21 -22 19 30 0.54 170 0 0 -22 27 13 10 57 55.9 1 244 -53 -23 2 4 -21 52 31 -23 3 14 -21 51 22 0.71 171 0 0 -21 59 0 10 57 55.9 0 243 -54 -22 33 51 .. .. .. -22 35 1 .. .. .. 72.78 Uncertainty in time = +/- 0 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4 327-091086 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 04 59.0075 DE: -24 40 48.312 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 04 59.0075 DE: -24 40 48.312 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (91) Aegina asteroid class: approx. diameter [km]: 107 approx. diameter ["]: 0.045 distance from Earth [AU]: 3.26280 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#144 date of fit: 2023 Aug 25 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): 0.004", 0.001", 95.257° remarks: * orbital elements for (91)Aegina : Mean anomaly = 192.2289990315 deg Arg. of pericenter = 74.3767621411 deg Long. of node = 10.4289493487 deg Inclination = 2.1029701587 deg Eccentricity = 0.1073616759 Semimajor axis = 2.5893304288 AU Perihelion dist = 2.3113355745 AU Mag: H = 9.17, G = 0.15 Epoch of elements : MJD 60230.45472222 TDT (2023 Oct 13.4547) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1442023Aug25,3.35,2023,10,13,10.913554,-0.025847,-0.339917,18.038393,-1.338118,0.004913,-0.000556,-0.000001,0.000000 71.1533,-24.7132,12.88,-7.76,False UCAC4 327-091086,17.08305768,-24.6800869,0.00,11.39,0.00,0.0,0,,17.10690420,-24.7131923,3.35,0.00,0,0,0 91,Aegina,14.69,107.400,3.2628,0,0,3.568,-3.60,,5.4,0 0,192.1214,2023,10,13,74.3768,10.4289,2.1030,0.10736,2.58933,2.31134,8.93,5.0,0.15 1.017,0.0037,0.0008,95,0.0037,Known errors,-1.00,0,-1,-1 20231013_091086,60183.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org