IOTA/IOTA-ES occultation update for (140) Siwa / UCAC4 466-001228 event on 2023 Jun 21, 20:28 UT Visible from SE Australia Summary ------- On 2023 Jun 21 UT, the 107 km diameter asteroid (140) Siwa will occult a 12.0 mag star in the constellation Pisces 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 1.56 mag to 13.28 mag (the magnitude of the asteroid) for at most 4.220 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 Jun 21, 20:24 - 2023 Jun 21, 20:31 * geocentric midpoint of event [JD]: 2460117.35304450 * magnitude of target star: 12.02 * magnitude drop [mag]: 1.56 * estimated maximum duration [s]: 4.220 * Moon: 12 % sunlit, 116° distance * Sun: 76° distance * rough path description: SE Australia The occultation path -------------------- * approximate projected width [km]: 132 * 1 sigma uncertainty interval [path widths]: +/- 0.09 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.005", 62°) * approx speed of asteroid's shadow [km/s]: 25.3715 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 466-001228 by 140 Siwa on 2023 Jun 21 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 73 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -54 30 7 .. .. .. -54 23 52 .... 74 0 0 -55 2 15 20 24 59.5 1 84 -55 -55 38 11 -54 26 36 -55 44 31 -54 20 22 .... 75 0 0 -54 58 31 20 24 59.5 1 83 -55 -55 34 28 -54 22 51 -55 40 49 -54 16 36 0.50 76 0 0 -54 54 33 20 24 59.6 2 82 -55 -55 30 31 -54 18 50 -55 36 52 -54 12 35 0.57 77 0 0 -54 50 18 20 24 59.7 2 81 -54 -55 26 19 -54 14 34 -55 32 40 -54 8 19 0.61 78 0 0 -54 45 49 20 24 59.9 3 80 -54 -55 21 51 -54 10 3 -55 28 13 -54 3 48 0.63 79 0 0 -54 41 5 20 25 0.0 3 80 -54 -55 17 9 -54 5 17 -55 23 31 -53 59 1 0.64 80 0 0 -54 36 5 20 25 0.2 4 79 -53 -55 12 12 -54 0 16 -55 18 34 -53 53 59 0.65 81 0 0 -54 30 51 20 25 0.5 5 78 -53 -55 6 59 -53 54 59 -55 13 22 -53 48 42 0.66 82 0 0 -54 25 20 20 25 0.8 5 77 -53 -55 1 31 -53 49 26 -55 7 54 -53 43 9 0.67 83 0 0 -54 19 35 20 25 1.1 6 76 -52 -54 55 48 -53 43 38 -55 2 12 -53 37 21 0.67 84 0 0 -54 13 34 20 25 1.4 6 76 -52 -54 49 49 -53 37 35 -54 56 14 -53 31 17 0.67 85 0 0 -54 7 17 20 25 1.8 7 75 -52 -54 43 35 -53 31 16 -54 50 0 -53 24 58 0.68 86 0 0 -54 0 45 20 25 2.2 8 74 -51 -54 37 6 -53 24 41 -54 43 31 -53 18 23 0.68 87 0 0 -53 53 58 20 25 2.6 8 73 -51 -54 30 21 -53 17 51 -54 36 47 -53 11 32 0.68 88 0 0 -53 46 55 20 25 3.1 9 72 -50 -54 23 21 -53 10 45 -54 29 47 -53 4 25 0.68 89 0 0 -53 39 36 20 25 3.6 9 71 -50 -54 16 5 -53 3 23 -54 22 31 -52 57 3 0.69 90 0 0 -53 32 1 20 25 4.2 10 71 -50 -54 8 33 -52 55 46 -54 15 0 -52 49 25 0.69 91 0 0 -53 24 11 20 25 4.8 11 70 -49 -54 0 46 -52 47 53 -54 7 14 -52 41 31 0.69 92 0 0 -53 16 4 20 25 5.4 11 69 -49 -53 52 43 -52 39 43 -53 59 11 -52 33 21 0.69 93 0 0 -53 7 42 20 25 6.1 12 68 -48 -53 44 24 -52 31 18 -53 50 53 -52 24 56 0.69 94 0 0 -52 59 4 20 25 6.8 12 67 -48 -53 35 49 -52 22 37 -53 42 18 -52 16 14 0.69 95 0 0 -52 50 10 20 25 7.5 13 67 -47 -53 26 58 -52 13 39 -53 33 28 -52 7 16 0.69 96 0 0 -52 41 0 20 25 8.3 14 66 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0 0 -17 35 52 20 31 14.0 26 283 47 -18 12 10 -16 59 51 -18 18 35 -16 53 32 0.73 -141 0 0 -17 27 52 20 31 16.3 25 282 47 -18 4 8 -16 51 53 -18 10 32 -16 45 35 0.73 -140 0 0 -17 20 16 20 31 18.6 24 282 47 -17 56 30 -16 44 19 -18 2 53 -16 38 1 0.74 -139 0 0 -17 13 4 20 31 20.7 24 281 48 -17 49 16 -16 37 9 -17 55 40 -16 30 52 0.74 -138 0 0 -17 6 18 20 31 22.8 23 281 48 -17 42 27 -16 30 24 -17 48 51 -16 24 7 0.74 -137 0 0 -16 59 56 20 31 24.7 22 281 49 -17 36 4 -16 24 4 -17 42 26 -16 17 48 0.74 -136 0 0 -16 53 59 20 31 26.6 21 280 49 -17 30 5 -16 18 9 -17 36 27 -16 11 52 0.74 -135 0 0 -16 48 26 20 31 28.5 20 280 49 -17 24 31 -16 12 38 -17 30 53 -16 6 22 0.74 -134 0 0 -16 43 19 20 31 30.2 19 279 49 -17 19 22 -16 7 32 -17 25 44 -16 1 16 0.74 -133 0 0 -16 38 36 20 31 31.8 18 279 50 -17 14 38 -16 2 51 -17 21 0 -15 56 36 0.74 -132 0 0 -16 34 19 20 31 33.4 17 279 50 -17 10 19 -15 58 35 -17 16 41 -15 52 20 0.74 -131 0 0 -16 30 27 20 31 34.9 16 278 50 -17 6 26 -15 54 44 -17 12 47 -15 48 29 0.74 -130 0 0 -16 27 0 20 31 36.3 15 278 50 -17 2 58 -15 51 18 -17 9 19 -15 45 3 0.74 -129 0 0 -16 23 58 20 31 37.6 14 278 50 -16 59 55 -15 48 17 -17 6 16 -15 42 2 0.74 -128 0 0 -16 21 22 20 31 38.9 13 277 50 -16 57 18 -15 45 41 -17 3 38 -15 39 27 0.75 -127 0 0 -16 19 10 20 31 40.0 12 277 50 -16 55 5 -15 43 31 -17 1 26 -15 37 16 0.75 -126 0 0 -16 17 24 20 31 41.1 11 277 50 -16 53 19 -15 41 45 -16 59 39 -15 35 31 0.75 -125 0 0 -16 16 3 20 31 42.1 10 276 50 -16 51 57 -15 40 25 -16 58 18 -15 34 10 0.75 -124 0 0 -16 15 7 20 31 43.0 9 276 50 -16 51 1 -15 39 29 -16 57 21 -15 33 15 0.76 -123 0 0 -16 14 37 20 31 43.8 8 276 50 -16 50 30 -15 38 59 -16 56 50 -15 32 45 0.76 -122 0 0 -16 14 31 20 31 44.5 8 276 50 -16 50 25 -15 38 54 -16 56 45 -15 32 40 0.76 -121 0 0 -16 14 51 20 31 45.2 7 275 50 -16 50 44 -15 39 14 -16 57 5 -15 32 59 0.77 -120 0 0 -16 15 36 20 31 45.7 6 275 50 -16 51 29 -15 39 59 -16 57 49 -15 33 44 0.78 -119 0 0 -16 16 46 20 31 46.2 5 275 50 -16 52 39 -15 41 8 -16 59 0 -15 34 54 0.79 -118 0 0 -16 18 21 20 31 46.5 4 274 49 -16 54 15 -15 42 43 -17 0 35 -15 36 29 0.81 -117 0 0 -16 20 21 20 31 46.8 3 274 49 -16 56 15 -15 44 43 -17 2 35 -15 38 28 0.84 -116 0 0 -16 22 46 20 31 47.0 2 274 49 -16 58 40 -15 47 7 -17 5 1 -15 40 53 0.90 -115 0 0 -16 25 36 20 31 47.2 1 274 48 -17 1 31 -15 49 57 -17 7 52 -15 43 42 1.12 Uncertainty in time = +/- 1 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 466-001228 * constellation : Pisces * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 00 56 47.2721 DE: +03 04 32.676 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 00 56 47.2722 DE: +03 04 32.676 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (140) Siwa asteroid class: approx. diameter [km]: 107 approx. diameter ["]: 0.064 distance from Earth [AU]: 2.28750 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#170 date of fit: 2022 Nov 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): 0.014", 0.005", 62.418° remarks: * orbital elements for (140)Siwa : Mean anomaly = 28.9556256723 deg Arg. of pericenter = 197.0682031955 deg Long. of node = 107.1651753299 deg Inclination = 3.1853107370 deg Eccentricity = 0.2141714715 Semimajor axis = 2.7338011781 AU Perihelion dist = 2.1482989569 AU Mag: H = 8.50, G = 0.15 Epoch of elements : MJD 60116.85305555 TDT (2023 Jun 21.8531) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1702022Nov25,4.22,2023,6,21,20.473068,0.192620,-0.550304,13.516993,4.729048,-0.004741,-0.002052,0.000000,0.000000 157.6241,3.2016,-126.63,23.44,False UCAC4 466-001228,0.94646445,3.0757431,0.00,12.02,0.00,0.0,0,K,0.96638478,3.2016205,1.55,0.00,0,0,0 140,Siwa,13.28,107.0,2.2875,0,0,3.470,18.18,,5.8,0 0,28.7696,2023,6,21,197.0682,107.1652,3.1853,0.21417,2.73380,2.14830,8.53,5.0,0.15 1.088,0.0143,0.0053,62,0.0057,Known errors,-1.00,-1,-1,-1 20230621_001228,60063.20 ------ 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