IOTA/IOTA-ES occultation update for (2920) Automedon / TYC 0177-02784-1 event on 2023 Sep 23, 00:46 UT Visible from SW Asia, Europe Summary ------- On 2023 Sep 23 UT, the 105.4 km diameter asteroid (2920) Automedon will occult a 10.4 mag star in the constellation Canis Minor for observers along a path across SW Asia, Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.22 mag to 16.61 mag (the magnitude of the asteroid) for at most 4.050 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 23, 00:42 - 2023 Sep 23, 00:50 * geocentric midpoint of event [JD]: 2460210.53212067 * magnitude of target star: 10.39 * magnitude drop [mag]: 6.22 * estimated maximum duration [s]: 4.050 * Moon: 52 % sunlit, 151° distance * Sun: 68° distance * rough path description: SW Asia, Europe The occultation path -------------------- * approximate projected width [km]: 107 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.001", 109°) * approx speed of asteroid's shadow [km/s]: 26.0452 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0177-02784-1 by 2920 Automedon on 2023 Sep 23 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 5 0 0 40 7 30 0 42 13.8 0 82 -47 39 38 23 40 36 39 39 31 34 40 43 29 .... 6 0 0 40 13 35 0 42 13.8 1 83 -46 39 44 31 40 42 43 39 37 43 40 49 32 -0.14 7 0 0 40 19 15 0 42 13.9 2 84 -46 39 50 12 40 48 20 39 43 25 40 55 9 -0.15 8 0 0 40 24 29 0 42 14.0 3 84 -46 39 55 28 40 53 32 39 48 41 41 0 21 -0.15 9 0 0 40 29 17 0 42 14.2 3 85 -45 40 0 18 40 58 19 39 53 31 41 5 7 -0.15 10 0 0 40 33 40 0 42 14.4 4 85 -45 40 4 42 41 2 40 39 57 56 41 9 27 -0.15 11 0 0 40 37 37 0 42 14.7 5 86 -44 40 8 40 41 6 35 40 1 54 41 13 22 -0.15 12 0 0 40 41 8 0 42 15.0 6 87 -44 40 12 13 41 10 5 40 5 27 41 16 52 -0.16 13 0 0 40 44 14 0 42 15.3 6 87 -43 40 15 20 41 13 10 40 8 34 41 19 56 -0.16 14 0 0 40 46 54 0 42 15.7 7 88 -43 40 18 1 41 15 49 40 11 16 41 22 35 -0.16 15 0 0 40 49 8 0 42 16.2 8 89 -42 40 20 16 41 18 3 40 13 32 41 24 49 -0.16 16 0 0 40 50 58 0 42 16.6 9 89 -42 40 22 6 41 19 51 40 15 22 41 26 37 -0.16 17 0 0 40 52 22 0 42 17.2 9 90 -41 40 23 31 41 21 15 40 16 46 41 28 0 -0.16 18 0 0 40 53 20 0 42 17.7 10 91 -41 40 24 30 41 22 13 40 17 45 41 28 58 -0.16 19 0 0 40 53 53 0 42 18.3 11 91 -40 40 25 3 41 22 45 40 18 18 41 29 31 -0.16 20 0 0 40 54 1 0 42 19.0 12 92 -40 40 25 10 41 22 53 40 18 26 41 29 39 -0.16 21 0 0 40 53 43 0 42 19.7 12 93 -39 40 24 52 41 22 35 40 18 8 41 29 21 -0.16 22 0 0 40 52 59 0 42 20.4 13 93 -39 40 24 9 41 21 52 40 17 24 41 28 38 -0.16 23 0 0 40 51 50 0 42 21.2 14 94 -38 40 23 0 41 20 43 40 16 15 41 27 29 -0.16 24 0 0 40 50 16 0 42 22.0 15 95 -37 40 21 25 41 19 10 40 14 40 41 25 56 -0.16 25 0 0 40 48 16 0 42 22.8 16 95 -37 40 19 24 41 17 10 40 12 39 41 23 56 -0.16 26 0 0 40 45 51 0 42 23.7 16 96 -36 40 16 58 41 14 46 40 10 13 41 21 32 -0.16 27 0 0 40 42 59 0 42 24.7 17 97 -36 40 14 5 41 11 55 40 7 20 41 18 42 -0.16 28 0 0 40 39 42 0 42 25.7 18 97 -35 40 10 47 41 8 40 40 4 2 41 15 26 -0.16 29 0 0 40 36 0 0 42 26.7 19 98 -35 40 7 3 41 4 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37 24 38 31 35 39 44 18 -0.15 43 0 0 38 58 0 0 42 46.0 29 107 -26 38 28 30 39 27 33 38 21 37 39 34 28 -0.15 44 0 0 38 47 38 0 42 47.7 30 108 -25 38 18 5 39 17 14 38 11 10 39 24 10 -0.15 45 0 0 38 36 49 0 42 49.5 31 109 -25 38 7 12 39 6 28 38 0 16 39 13 25 -0.15 46 0 0 38 25 31 0 42 51.4 32 109 -24 37 55 51 38 55 15 37 48 54 39 2 12 -0.15 47 0 0 38 13 46 0 42 53.2 33 110 -23 37 44 1 38 43 33 37 37 4 38 50 31 -0.15 48 0 0 38 1 32 0 42 55.2 34 111 -23 37 31 43 38 31 23 37 24 45 38 38 23 -0.15 49 0 0 37 48 50 0 42 57.2 34 111 -22 37 18 57 38 18 46 37 11 58 38 25 46 -0.15 50 0 0 37 35 40 0 42 59.2 35 112 -21 37 5 43 38 5 39 36 58 42 38 12 41 -0.15 51 0 0 37 22 1 0 43 1.3 36 113 -21 36 51 59 37 52 5 36 44 58 37 59 7 -0.15 52 0 0 37 7 53 0 43 3.5 37 113 -20 36 37 46 37 38 1 36 30 44 37 45 5 -0.15 53 0 0 36 53 16 0 43 5.7 38 114 -19 36 23 5 37 23 29 36 16 2 37 30 33 -0.15 54 0 0 36 38 9 0 43 7.9 39 115 -19 36 7 54 37 8 27 36 0 50 37 15 33 -0.15 55 0 0 36 22 34 0 43 10.3 39 115 -18 35 52 14 36 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47 3 35 53 2 19 49 3 43 52 -0.17 122 0 0 2 24 40 0 47 46.2 66 280 46 1 50 42 2 58 42 1 42 45 3 6 40 -0.17 123 0 0 1 47 44 0 47 50.9 65 281 47 1 13 49 2 21 43 1 5 54 2 29 40 -0.17 124 0 0 1 11 2 0 47 55.6 64 282 48 0 37 11 1 44 57 0 29 16 1 52 53 -0.17 125 0 0 0 34 35 0 48 0.1 63 282 49 0 0 47 1 8 26 - 0 7 6 1 16 21 -0.17 126 0 0 - 0 1 37 0 48 4.7 62 283 50 - 0 35 20 0 32 10 - 0 43 13 0 40 5 -0.17 127 0 0 - 0 37 31 0 48 9.1 61 284 51 - 1 11 10 - 0 3 49 - 1 19 2 0 4 5 -0.17 128 0 0 - 1 13 8 0 48 13.6 59 284 52 - 1 46 42 - 0 39 30 - 1 54 33 - 0 31 37 -0.17 129 0 0 - 1 48 25 0 48 17.9 58 285 53 - 2 21 55 - 1 14 51 - 2 29 45 - 1 7 0 -0.17 130 0 0 - 2 23 22 0 48 22.2 57 285 54 - 2 56 48 - 1 49 54 - 3 4 36 - 1 42 3 -0.17 131 0 0 - 2 57 59 0 48 26.4 56 286 55 - 3 31 19 - 2 24 35 - 3 39 7 - 2 16 45 -0.17 132 0 0 - 3 32 13 0 48 30.6 55 286 56 - 4 5 28 - 2 58 54 - 4 13 15 - 2 51 6 -0.17 133 0 0 - 4 6 5 0 48 34.6 54 286 57 - 4 39 15 - 3 32 51 - 4 47 0 - 3 25 4 -0.17 134 0 0 - 4 39 33 0 48 38.6 53 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51 41 -18 37 56 -0.18 171 0 0 -19 29 12 0 50 9.9 14 282 70 -19 58 59 -18 59 22 -20 5 57 -18 52 23 -0.18 172 0 0 -19 43 1 0 50 10.9 13 281 69 -20 12 44 -19 13 15 -20 19 41 -19 6 16 -0.18 173 0 0 -19 56 17 0 50 11.8 12 281 69 -20 25 57 -19 26 35 -20 32 53 -19 19 37 -0.18 174 0 0 -20 9 1 0 50 12.6 11 281 68 -20 38 37 -19 39 22 -20 45 32 -19 32 25 -0.18 175 0 0 -20 21 12 0 50 13.3 10 280 68 -20 50 45 -19 51 37 -20 57 40 -19 44 41 -0.18 176 0 0 -20 32 52 0 50 14.0 9 280 67 -21 2 21 -20 3 20 -21 9 15 -19 56 25 -0.18 177 0 0 -20 43 59 0 50 14.6 8 280 66 -21 13 25 -20 14 30 -21 20 18 -20 7 36 -0.18 178 0 0 -20 54 34 0 50 15.1 7 279 66 -21 23 57 -20 25 8 -21 30 49 -20 18 14 -0.18 179 0 0 -21 4 37 0 50 15.6 6 279 65 -21 33 57 -20 35 14 -21 40 49 -20 28 21 -0.19 180 0 0 -21 14 8 0 50 16.0 5 279 64 -21 43 26 -20 44 48 -21 50 17 -20 37 56 -0.19 -179 0 0 -21 23 8 0 50 16.3 4 278 64 -21 52 23 -20 53 50 -21 59 13 -20 46 59 -0.20 -178 0 0 -21 31 35 0 50 16.5 3 278 63 -22 0 48 -21 2 20 -22 7 38 -20 55 29 -0.20 -177 0 0 -21 39 32 0 50 16.7 2 277 62 -22 8 42 -21 10 19 -22 15 31 -21 3 28 -0.22 -176 0 0 -21 46 56 0 50 16.9 1 277 62 -22 16 4 -21 17 46 -22 22 53 -21 10 56 -0.26 -175 0 0 -21 53 49 0 50 16.9 0 277 61 -22 22 55 -21 24 41 -22 29 43 -21 17 51 -0.56 Uncertainty in time = +/- 2 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: TYC 0177-02784-1 * constellation : Canis Minor * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 26 33.4241 DE: +06 09 38.197 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 26 33.4241 DE: +06 09 38.197 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2920) Automedon asteroid class: approx. diameter [km]: 105 approx. diameter ["]: 0.028 distance from Earth [AU]: 5.28230 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#60 date of fit: 2023 Aug 23 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): 0.015", 0.001", 108.569° remarks: * orbital elements for (2920)Automedon : Mean anomaly = 31.7693645750 deg Arg. of pericenter = 198.7223582108 deg Long. of node = 230.9454892478 deg Inclination = 21.1115397089 deg Eccentricity = 0.0281354570 Semimajor axis = 5.1140243283 AU Perihelion dist = 4.9701389167 AU Mag: H = 8.83, G = 0.15 Epoch of elements : MJD 60210.03215278 TDT (2023 Sep 23.0322) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#602023Aug23,4.05,2023,9,23,0.770896,0.081710,0.135696,12.594815,-7.581484,-0.005504,0.000242,0.000000,0.000000 98.7716,6.1158,166.60,0.10,False TYC 0177-02784-1,7.44261778,6.1606102,0.00,10.39,0.00,0.0,0,,7.46350682,6.1158326,6.23,0.00,0,0,0 2920,Automedon,16.61,105.400,5.2823,0,0,1.407,-12.62,,5.6,0 0,31.6814,2023,9,22,198.7224,230.9455,21.1115,0.02814,5.11402,4.97014,8.83,5.0,0.15 1.117,0.0147,0.0006,109,0.0147,Known errors,-1.00,0,-1,-1 20230923_2784-1,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org