IOTA/IOTA-ES occultation update for (2) Pallas / HIP 39848 event on 2023 May 11, 03:04 UT Visible from Canada, N USA Summary ------- On 2023 May 11 UT, the 532 km diameter asteroid (2) Pallas will occult a 7.3 mag star in the constellation Canis Minor for observers along a path across Canada, N USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.70 mag to 8.73 mag (the magnitude of the asteroid) for at most 16.800 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 May 11, 03:01 - 2023 May 11, 03:07 * geocentric midpoint of event [JD]: 2460075.62794000 * magnitude of target star: 7.29 * magnitude drop [mag]: 1.70 * estimated maximum duration [s]: 16.800 * Moon: 66 % sunlit, 160° distance * Sun: 74° distance * rough path description: Canada, N USA The occultation path -------------------- * approximate projected width [km]: 607 * 1 sigma uncertainty interval [path widths]: +/- 0.04 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.031, +/- 0.013) * 1 sigma uncertainty ellipse (major, minor, PA): (0.032", 0.012", 77°) * approx speed of asteroid's shadow [km/s]: 31.6699 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 39848 by 2 Pallas on 2023 May 11 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 118 0 0 9 56 54 3 1 17.3 0 85 73 7 13 28 12 44 43 7 1 44 12 57 7 .... 119 0 0 10 2 53 3 1 17.3 1 85 74 7 19 20 12 50 49 7 7 35 13 3 14 -0.39 120 0 0 10 9 15 3 1 17.5 2 85 75 7 25 35 12 57 19 7 13 50 13 9 44 -0.46 121 0 0 10 16 0 3 1 17.7 3 85 75 7 32 13 13 4 12 7 20 27 13 16 38 -0.48 122 0 0 10 23 8 3 1 17.9 4 85 76 7 39 14 13 11 29 7 27 27 13 23 55 -0.50 123 0 0 10 30 39 3 1 18.3 5 86 77 7 46 37 13 19 9 7 34 50 13 31 36 -0.51 124 0 0 10 38 34 3 1 18.7 6 86 78 7 54 22 13 27 12 7 42 35 13 39 40 -0.52 125 0 0 10 46 51 3 1 19.2 7 86 79 8 2 31 13 35 39 7 50 42 13 48 8 -0.52 126 0 0 10 55 31 3 1 19.7 8 86 80 8 11 1 13 44 29 7 59 12 13 56 59 -0.53 127 0 0 11 4 33 3 1 20.3 9 86 81 8 19 54 13 53 42 8 8 5 14 6 12 -0.53 128 0 0 11 13 58 3 1 21.0 10 87 81 8 29 9 14 3 17 8 17 19 14 15 48 -0.53 129 0 0 11 23 45 3 1 21.8 11 87 82 8 38 46 14 13 15 8 26 55 14 25 47 -0.53 130 0 0 11 33 54 3 1 22.6 12 87 83 8 48 44 14 23 36 8 36 53 14 36 9 -0.53 131 0 0 11 44 25 3 1 23.5 13 87 83 8 59 5 14 34 19 8 47 13 14 46 53 -0.54 132 0 0 11 55 18 3 1 24.5 14 87 84 9 9 47 14 45 24 8 57 54 14 57 59 -0.54 133 0 0 12 6 33 3 1 25.5 15 88 84 9 20 51 14 56 51 9 8 57 15 9 27 -0.54 134 0 0 12 18 10 3 1 26.6 16 88 84 9 32 15 15 8 40 9 20 21 15 21 17 -0.54 135 0 0 12 30 7 3 1 27.7 17 88 84 9 44 1 15 20 51 9 32 6 15 33 28 -0.54 136 0 0 12 42 26 3 1 29.0 18 89 84 9 56 8 15 33 23 9 44 11 15 46 1 -0.54 137 0 0 12 55 6 3 1 30.3 19 89 84 10 8 35 15 46 16 9 56 38 15 58 56 -0.54 138 0 0 13 8 7 3 1 31.6 20 89 84 10 21 23 15 59 30 10 9 25 16 12 11 -0.54 139 0 0 13 21 28 3 1 33.1 21 89 83 10 34 32 16 13 5 10 22 32 16 25 47 -0.54 140 0 0 13 35 9 3 1 34.6 22 90 83 10 48 0 16 27 1 10 36 0 16 39 43 -0.54 141 0 0 13 49 10 3 1 36.1 23 90 82 11 1 48 16 41 16 10 49 47 16 54 0 -0.54 142 0 0 14 3 31 3 1 37.7 24 90 81 11 15 56 16 55 52 11 3 54 17 8 37 -0.54 143 0 0 14 18 12 3 1 39.4 25 91 80 11 30 23 17 10 47 11 18 20 17 23 33 -0.54 144 0 0 14 33 12 3 1 41.2 26 91 79 11 45 9 17 26 2 11 33 6 17 38 49 -0.55 145 0 0 14 48 30 3 1 43.0 27 92 79 12 0 14 17 41 35 11 48 10 17 54 24 -0.55 146 0 0 15 4 8 3 1 44.8 28 92 78 12 15 38 17 57 28 12 3 32 18 10 17 -0.55 147 0 0 15 20 4 3 1 46.8 29 92 77 12 31 20 18 13 39 12 19 13 18 26 29 -0.55 148 0 0 15 36 18 3 1 48.8 30 93 76 12 47 19 18 30 8 12 35 12 18 43 0 -0.55 149 0 0 15 52 49 3 1 50.8 31 93 75 13 3 37 18 46 54 12 51 28 18 59 47 -0.55 150 0 0 16 9 38 3 1 52.9 32 94 74 13 20 12 19 3 58 13 8 2 19 16 52 -0.55 151 0 0 16 26 44 3 1 55.1 33 94 73 13 37 3 19 21 19 13 24 53 19 34 15 -0.55 152 0 0 16 44 6 3 1 57.3 34 95 72 13 54 12 19 38 57 13 42 0 19 51 54 -0.55 153 0 0 17 1 45 3 1 59.6 35 95 71 14 11 36 19 56 51 13 59 24 20 9 49 -0.55 154 0 0 17 19 39 3 2 1.9 36 96 70 14 29 17 20 15 1 14 17 3 20 28 0 -0.55 155 0 0 17 37 49 3 2 4.3 37 97 70 14 47 13 20 33 26 14 34 58 20 46 26 -0.55 156 0 0 17 56 14 3 2 6.8 37 97 69 15 5 24 20 52 6 14 53 9 21 5 7 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0 48 20 34 3 6 57.3 19 256 -16 45 38 22 51 7 2 45 26 42 51 19 20 -0.56 - 85 0 0 48 22 32 3 6 58.1 18 257 -16 45 40 23 51 8 57 45 28 44 51 21 15 -0.56 - 84 0 0 48 24 14 3 6 59.0 18 258 -16 45 42 7 51 10 37 45 30 28 51 22 54 -0.56 - 83 0 0 48 25 40 3 6 59.8 17 258 -17 45 43 35 51 12 0 45 31 56 51 24 18 -0.56 - 82 0 0 48 26 49 3 7 0.5 17 259 -17 45 44 46 51 13 8 45 33 8 51 25 26 -0.56 - 81 0 0 48 27 43 3 7 1.3 16 260 -18 45 45 41 51 14 1 45 34 3 51 26 18 -0.56 - 80 0 0 48 28 21 3 7 2.0 15 261 -18 45 46 20 51 14 38 45 34 41 51 26 55 -0.56 - 79 0 0 48 28 42 3 7 2.7 15 261 -18 45 46 42 51 14 59 45 35 3 51 27 16 -0.56 - 78 0 0 48 28 48 3 7 3.3 14 262 -19 45 46 47 51 15 5 45 35 9 51 27 22 -0.56 - 77 0 0 48 28 38 3 7 4.0 13 263 -19 45 46 36 51 14 55 45 34 58 51 27 12 -0.56 - 76 0 0 48 28 11 3 7 4.6 13 264 -19 45 46 9 51 14 29 45 34 30 51 26 47 -0.56 - 75 0 0 48 27 28 3 7 5.1 12 265 -20 45 45 25 51 13 48 45 33 46 51 26 6 -0.56 - 74 0 0 48 26 30 3 7 5.7 11 265 -20 45 44 24 51 12 52 45 32 45 51 25 9 -0.57 - 73 0 0 48 25 15 3 7 6.2 11 266 -20 45 43 7 51 11 40 45 31 28 51 23 57 -0.57 - 72 0 0 48 23 45 3 7 6.7 10 267 -20 45 41 34 51 10 12 45 29 55 51 22 30 -0.57 - 71 0 0 48 21 58 3 7 7.1 9 268 -21 45 39 44 51 8 28 45 28 5 51 20 47 -0.57 - 70 0 0 48 19 55 3 7 7.5 9 268 -21 45 37 38 51 6 30 45 25 58 51 18 48 -0.57 - 69 0 0 48 17 36 3 7 7.9 8 269 -21 45 35 15 51 4 15 45 23 35 51 16 34 -0.58 - 68 0 0 48 15 1 3 7 8.3 7 270 -22 45 32 36 51 1 45 45 20 55 51 14 4 -0.58 - 67 0 0 48 12 11 3 7 8.6 7 271 -22 45 29 40 50 58 59 45 17 59 51 11 19 -0.58 - 66 0 0 48 9 4 3 7 8.9 6 271 -22 45 26 28 50 55 58 45 14 47 51 8 18 -0.59 - 65 0 0 48 5 41 3 7 9.1 5 272 -22 45 22 59 50 52 41 45 11 18 51 5 1 -0.59 - 64 0 0 48 2 1 3 7 9.4 5 273 -23 45 19 14 50 49 8 45 7 32 51 1 29 -0.60 - 63 0 0 47 58 6 3 7 9.6 4 274 -23 45 15 12 50 45 20 45 3 30 50 57 42 -0.61 - 62 0 0 47 53 55 3 7 9.7 3 274 -23 45 10 54 50 41 16 44 59 12 50 53 38 -0.62 - 61 0 0 47 49 28 3 7 9.9 3 275 -23 45 6 20 50 36 57 44 54 37 50 49 19 -0.64 - 60 0 0 47 44 44 3 7 10.0 2 276 -24 45 1 29 50 32 21 44 49 45 50 44 44 -0.67 - 59 0 0 47 39 44 3 7 10.1 1 277 -24 44 56 21 50 27 30 44 44 37 50 39 54 -0.75 - 58 0 0 47 34 28 3 7 10.1 1 277 -24 44 50 57 50 22 23 44 39 12 50 34 48 -1.02 - 57 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 50 17 0 .. .. .. 50 29 26 .... Uncertainty in time = +/- 2 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: HIP 39848 * constellation : Canis Minor * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 08 08 27.5643 DE: +05 21 59.306 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 08 08 27.5640 DE: +05 21 59.307 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 7.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2) Pallas asteroid class: ShapeModel approx. diameter [km]: 532 approx. diameter ["]: 0.331 distance from Earth [AU]: 2.21570 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#57 date of fit: 2023 Apr 24 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): 0.032", 0.012", 77.02° remarks: * orbital elements for (2)Pallas : Mean anomaly = 13.9086887362 deg Arg. of pericenter = 310.8700842913 deg Long. of node = 172.9187531500 deg Inclination = 34.9266070196 deg Eccentricity = 0.2301481808 Semimajor axis = 2.7698684225 AU Perihelion dist = 2.1323882439 AU Mag: H = 4.12, G = 0.11 Epoch of elements : MJD 60075.12791667 TDT (2023 May 11.1279) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Apr24,16.80,2023,5,11,3.070560,-0.154357,0.454771,16.919379,5.767405,0.004875,-0.001479,0.000000,0.000000 -152.2874,5.2984,133.05,17.79,False HIP 39848,8.14099013,5.3664736,0.00,7.29,0.00,0.0,0,,8.16133030,5.2984340,1.69,0.00,0,0,0 2,Pallas,8.73,532.0,2.2157,0,0,4.497,22.88,,28.2,0 0,13.8813,2023,5,11,310.8701,172.9188,34.9266,0.23015,2.76987,2.13239,4.12,5.0,0.15 1.036,0.0317,0.0117,77,0.0120,Known errors,-1.00,-1,-1,-1 20230511__39848,60063.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org