IOTA/IOTA-ES occultation update for (393) Lampetia / TYC 5170-01498-1 event on 2023 Oct 29, 11:31 UT Visible from Australia Summary ------- On 2023 Oct 29 UT, the 129.2 km diameter asteroid (393) Lampetia will occult a 10.7 mag star in the constellation Aquila 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 1.82 mag to 12.29 mag (the magnitude of the asteroid) for at most 5.310 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 29, 11:27 - 2023 Oct 29, 11:36 * geocentric midpoint of event [JD]: 2460246.98041862 * magnitude of target star: 10.69 * magnitude drop [mag]: 1.82 * estimated maximum duration [s]: 5.310 * Moon: 99 % sunlit, 98° distance * Sun: 90° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 134 * 1 sigma uncertainty interval [path widths]: +/- 0.04 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.001", 78°) * approx speed of asteroid's shadow [km/s]: 24.3292 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5170-01498-1 by 393 Lampetia on 2023 Oct 29 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 -10 20 57 11 27 35.7 1 95 87 -10 57 33 - 9 44 28 -11 0 17 - 9 41 44 .... 6 0 0 -10 26 15 11 27 35.8 2 95 86 -11 2 51 - 9 49 45 -11 5 36 - 9 47 2 0.22 7 0 0 -10 31 39 11 27 36.0 3 94 86 -11 8 15 - 9 55 9 -11 11 0 - 9 52 26 0.24 8 0 0 -10 37 9 11 27 36.3 4 94 85 -11 13 46 -10 0 39 -11 16 30 - 9 57 55 0.25 9 0 0 -10 42 45 11 27 36.6 5 94 84 -11 19 22 -10 6 14 -11 22 6 -10 3 30 0.26 10 0 0 -10 48 26 11 27 37.0 6 94 84 -11 25 3 -10 11 55 -11 27 48 -10 9 11 0.26 11 0 0 -10 54 13 11 27 37.6 7 94 83 -11 30 51 -10 17 41 -11 33 35 -10 14 58 0.27 12 0 0 -11 0 5 11 27 38.1 8 94 82 -11 36 43 -10 23 33 -11 39 28 -10 20 50 0.27 13 0 0 -11 6 3 11 27 38.8 9 93 81 -11 42 41 -10 29 31 -11 45 26 -10 26 47 0.27 14 0 0 -11 12 6 11 27 39.6 10 93 80 -11 48 44 -10 35 33 -11 51 29 -10 32 50 0.27 15 0 0 -11 18 14 11 27 40.4 11 93 79 -11 54 53 -10 41 41 -11 57 37 -10 38 57 0.27 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-43 -23 22 12 -22 9 27 -23 24 55 -22 6 45 0.28 152 0 0 -22 44 22 11 35 22.8 30 278 -43 -23 20 48 -22 8 3 -23 23 31 -22 5 21 0.28 153 0 0 -22 42 51 11 35 25.0 30 277 -44 -23 19 16 -22 6 32 -23 22 0 -22 3 49 0.28 154 0 0 -22 41 12 11 35 27.1 29 277 -45 -23 17 38 -22 4 52 -23 20 21 -22 2 10 0.28 155 0 0 -22 39 25 11 35 29.2 28 277 -45 -23 15 51 -22 3 6 -23 18 35 -22 0 23 0.28 156 0 0 -22 37 31 11 35 31.3 27 276 -46 -23 13 57 -22 1 11 -23 16 41 -21 58 29 0.28 157 0 0 -22 35 30 11 35 33.2 26 276 -46 -23 11 56 -21 59 10 -23 14 40 -21 56 27 0.28 158 0 0 -22 33 21 11 35 35.1 25 275 -47 -23 9 47 -21 57 1 -23 12 31 -21 54 18 0.28 159 0 0 -22 31 5 11 35 37.0 24 275 -48 -23 7 31 -21 54 44 -23 10 15 -21 52 1 0.28 160 0 0 -22 28 41 11 35 38.7 23 274 -48 -23 5 8 -21 52 20 -23 7 52 -21 49 38 0.28 161 0 0 -22 26 10 11 35 40.4 22 274 -49 -23 2 37 -21 49 49 -23 5 21 -21 47 6 0.29 162 0 0 -22 23 32 11 35 42.1 21 273 -49 -23 0 0 -21 47 11 -23 2 43 -21 44 28 0.29 163 0 0 -22 20 47 11 35 43.6 20 273 -50 -22 57 14 -21 44 25 -22 59 58 -21 41 42 0.29 164 0 0 -22 17 54 11 35 45.2 19 273 -50 -22 54 22 -21 41 33 -22 57 6 -21 38 50 0.29 165 0 0 -22 14 55 11 35 46.6 18 272 -51 -22 51 23 -21 38 33 -22 54 7 -21 35 50 0.29 166 0 0 -22 11 48 11 35 48.0 18 272 -51 -22 48 17 -21 35 26 -22 51 1 -21 32 43 0.29 167 0 0 -22 8 34 11 35 49.3 17 271 -52 -22 45 3 -21 32 12 -22 47 47 -21 29 29 0.29 168 0 0 -22 5 14 11 35 50.5 16 271 -52 -22 41 43 -21 28 51 -22 44 27 -21 26 8 0.29 169 0 0 -22 1 46 11 35 51.7 15 271 -52 -22 38 16 -21 25 23 -22 41 0 -21 22 40 0.29 170 0 0 -21 58 12 11 35 52.8 14 270 -53 -22 34 42 -21 21 49 -22 37 26 -21 19 6 0.29 171 0 0 -21 54 31 11 35 53.8 13 270 -53 -22 31 1 -21 18 7 -22 33 45 -21 15 24 0.29 172 0 0 -21 50 43 11 35 54.7 12 269 -53 -22 27 14 -21 14 19 -22 29 58 -21 11 36 0.29 173 0 0 -21 46 49 11 35 55.6 11 269 -54 -22 23 20 -21 10 25 -22 26 4 -21 7 42 0.29 174 0 0 -21 42 48 11 35 56.4 10 269 -54 -22 19 19 -21 6 23 -22 22 4 -21 3 40 0.30 175 0 0 -21 38 41 11 35 57.2 9 268 -54 -22 15 12 -21 2 16 -22 17 56 -20 59 33 0.30 176 0 0 -21 34 27 11 35 57.9 8 268 -55 -22 10 59 -20 58 2 -22 13 43 -20 55 19 0.30 177 0 0 -21 30 7 11 35 58.5 7 268 -55 -22 6 39 -20 53 41 -22 9 23 -20 50 58 0.30 178 0 0 -21 25 41 11 35 59.0 6 267 -55 -22 2 13 -20 49 14 -22 4 57 -20 46 31 0.31 179 0 0 -21 21 8 11 35 59.5 5 267 -55 -21 57 41 -20 44 41 -22 0 25 -20 41 58 0.31 180 0 0 -21 16 29 11 35 59.8 4 266 -55 -21 53 2 -20 40 2 -21 55 47 -20 37 19 0.32 -179 0 0 -21 11 44 11 36 0.1 4 266 -55 -21 48 18 -20 35 17 -21 51 2 -20 32 34 0.33 -178 0 0 -21 6 54 11 36 0.4 3 266 -56 -21 43 28 -20 30 26 -21 46 12 -20 27 43 0.34 -177 0 0 -21 1 57 11 36 0.6 2 265 -56 -21 38 31 -20 25 29 -21 41 16 -20 22 46 0.38 -176 0 0 -20 56 55 11 36 0.7 1 265 -56 -21 33 29 -20 20 26 -21 36 14 -20 17 43 0.51 Uncertainty in time = +/- 1 secs Prediction of 2023 Oct 15.9 Data for the target star ------------------------ * name: TYC 5170-01498-1 * constellation : Aquila * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 16 38.9146 DE: -04 57 38.989 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 16 38.9146 DE: -04 57 38.990 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (393) Lampetia asteroid class: approx. diameter [km]: 129 approx. diameter ["]: 0.107 distance from Earth [AU]: 1.66800 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#131 date of fit: 2023 Oct 09 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): 0.013", 0.001", 77.586° remarks: * orbital elements for (393)Lampetia : Mean anomaly = 15.9974336938 deg Arg. of pericenter = 90.8842534609 deg Long. of node = 212.3933287731 deg Inclination = 14.8773598643 deg Eccentricity = 0.3299200013 Semimajor axis = 2.7794381915 AU Perihelion dist = 1.8624459397 AU Mag: H = 8.46, G = 0.15 Epoch of elements : MJD 60246.48041667 TDT (2023 Oct 29.4804) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1312023Oct09,5.31,2023,10,29,11.530047,-0.024862,-0.266685,13.673595,-1.266288,0.005105,0.001222,0.000000,0.000000 93.9810,-4.8872,2.99,-13.45,False TYC 5170-01498-1,20.27747632,-4.9608303,0.00,10.69,0.00,0.0,0,,20.29828526,-4.8871766,1.83,0.00,0,0,0 393,Lampetia,12.29,129.200,1.6680,0,0,4.824,-6.67,,8.4,0 0,15.8952,2023,10,29,90.8843,212.3933,14.8774,0.32992,2.77944,1.86245,8.42,5.0,0.15 1.037,0.0130,0.0006,78,0.0130,Known errors,-1.00,0,-1,-1 20231029_1498-1,60232.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Oct 15, 20:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org