IOTA/IOTA-ES occultation update for (246) Asporina / UCAC4 407-076829 event on 2023 Sep 04, 09:41 UT Visible from New Zealand, Australia Summary ------- On 2023 Sep 04 UT, the 57.1 km diameter asteroid (246) Asporina will occult a 10.9 mag star in the constellation Serpens for observers along a path across New Zealand, Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.16 mag to 12.90 mag (the magnitude of the asteroid) for at most 4.940 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 Sep 04, 09:32 - 2023 Sep 04, 09:50 * geocentric midpoint of event [JD]: 2460191.90400546 * magnitude of target star: 10.90 * magnitude drop [mag]: 2.16 * estimated maximum duration [s]: 4.940 * Moon: 76 % sunlit, 123° distance * Sun: 112° distance * rough path description: New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 59 * 1 sigma uncertainty interval [path widths]: +/- 0.17 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.001", 93°) * approx speed of asteroid's shadow [km/s]: 11.5477 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 407-076829 by 246 Asporina on 2023 Sep 4 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 64 0 0 33 34 30 9 32 50.4 0 100 53 33 18 18 .. .. .. 33 12 47 .. .. .. .... 65 0 0 33 24 53 9 32 50.5 1 101 53 33 8 39 33 41 7 33 3 7 33 46 38 0.19 66 0 0 33 14 34 9 32 50.7 2 102 52 32 58 16 33 30 50 32 52 44 33 36 22 0.22 67 0 0 33 3 31 9 32 51.0 3 102 52 32 47 10 33 19 50 32 41 37 33 25 23 0.24 68 0 0 32 51 44 9 32 51.4 3 103 51 32 35 20 33 8 6 32 29 45 33 13 40 0.24 69 0 0 32 39 12 9 32 52.0 4 103 51 32 22 45 32 55 38 32 17 9 33 1 12 0.25 70 0 0 32 25 55 9 32 52.7 5 104 50 32 9 24 32 42 24 32 3 47 32 48 0 0.25 71 0 0 32 11 52 9 32 53.6 6 104 49 31 55 18 32 28 26 31 49 40 32 34 3 0.25 72 0 0 31 57 4 9 32 54.6 7 105 49 31 40 25 32 13 41 31 34 46 32 19 20 0.25 73 0 0 31 41 28 9 32 55.7 8 105 48 31 24 45 31 58 9 31 19 4 32 3 50 0.25 74 0 0 31 25 5 9 32 57.0 9 106 48 31 8 18 31 41 51 31 2 35 31 47 32 0.25 75 0 0 31 7 53 9 32 58.4 10 106 47 30 51 2 31 24 44 30 45 17 31 30 27 0.26 76 0 0 30 49 53 9 33 0.0 11 107 46 30 32 56 31 6 48 30 27 10 31 12 33 0.26 77 0 0 30 31 3 9 33 1.7 11 107 46 30 14 1 30 48 3 30 8 13 30 53 49 0.26 78 0 0 30 11 22 9 33 3.6 12 108 45 29 54 15 30 28 27 29 48 25 30 34 15 0.26 79 0 0 29 50 50 9 33 5.7 13 108 44 29 33 37 30 8 0 29 27 46 30 13 51 0.26 80 0 0 29 29 25 9 33 8.0 14 109 44 29 12 7 29 46 42 29 6 14 29 52 34 0.26 81 0 0 29 7 8 9 33 10.4 15 109 43 28 49 43 29 24 30 28 43 48 29 30 24 0.26 82 0 0 28 43 56 9 33 13.0 16 110 42 28 26 26 29 1 25 28 20 28 29 7 21 0.26 83 0 0 28 19 50 9 33 15.7 17 110 41 28 2 13 28 37 25 27 56 13 28 43 23 0.26 84 0 0 27 54 47 9 33 18.7 18 111 41 27 37 4 28 12 29 27 31 2 28 18 29 0.26 85 0 0 27 28 48 9 33 21.8 19 111 40 27 10 58 27 46 36 27 4 53 27 52 39 0.26 86 0 0 27 1 51 9 33 25.2 20 112 39 26 43 53 27 19 46 26 37 47 27 25 51 0.26 87 0 0 26 33 55 9 33 28.8 21 112 38 26 15 50 26 51 58 26 9 41 26 58 5 0.26 88 0 0 26 4 59 9 33 32.5 22 112 38 25 46 46 26 23 9 25 40 35 26 29 19 0.26 89 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0.45 -110 59 59 -60 41 21 9 50 40.8 0 253 -30 -60 58 1 -60 24 42 -61 3 41 -60 19 3 0.96 Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4 407-076829 * constellation : Serpens * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 17 21.4583 DE: -08 42 46.314 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 17 21.4582 DE: -08 42 46.314 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.300) * V mag [mag]: 10.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (246) Asporina asteroid class: approx. diameter [km]: 57 approx. diameter ["]: 0.042 distance from Earth [AU]: 1.88350 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#75 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): 0.010", 0.001", 92.837° remarks: * orbital elements for (246)Asporina : Mean anomaly = 30.4500492921 deg Arg. of pericenter = 96.2116893371 deg Long. of node = 162.2723864133 deg Inclination = 15.6213682014 deg Eccentricity = 0.1084979844 Semimajor axis = 2.6939361475 AU Perihelion dist = 2.4016495054 AU Mag: H = 8.67, G = 0.15 Epoch of elements : MJD 60191.40402778 TDT (2023 Sep 04.4040) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#752023Aug22,4.94,2023,9,4,9.696131,-0.177703,-0.161397,4.383232,-4.823836,0.005054,-0.000385,0.000001,0.000000 145.9641,-8.7036,34.35,7.20,False UCAC4 407-076829,18.28929398,-8.7128652,0.00,10.90,0.00,0.0,0,,18.31086989,-8.7035819,2.16,0.00,0,0,0 246,Asporina,12.90,57.100,1.8835,0,0,1.381,-22.52,,3.0,0 0,30.3600,2023,9,4,96.2117,162.2724,15.6214,0.10850,2.69394,2.40165,8.50,5.0,0.15 1.170,0.0100,0.0011,93,0.0101,Known errors,-1.00,0,-1,-1 20230904_076829,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org