IOTA/IOTA-ES occultation update for (2) Pallas / UCAC4 300-013437 event on 2023 Jan 16, 09:53 UT Visible from Pacific Ocean Summary ------- On 2023 Jan 16 UT, the 532 km diameter asteroid (2) Pallas will occult a 12.5 mag star in the constellation Canis Major for observers along a path across Pacific Ocean. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.01 mag to 7.59 mag (the magnitude of the asteroid) for at most 47.540 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 Jan 16, 09:44 - 2023 Jan 16, 10:03 * geocentric midpoint of event [JD]: 2459960.91236659 * magnitude of target star: 12.50 * magnitude drop [mag]: 0.01 * estimated maximum duration [s]: 47.540 * Moon: 37 % sunlit, 105° distance * Sun: 126° distance * rough path description: Pacific Ocean Additional comments ------------------- very low mag drop The occultation path -------------------- * approximate projected width [km]: 546 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.052, +/- 0.018) * 1 sigma uncertainty ellipse (major, minor, PA): (0.052", 0.018", 89°) * approx speed of asteroid's shadow [km/s]: 11.1909 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 300-013437 by 2 Pallas on 2023 Jan 16 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 ' " Longitude Longitude Longitude Longitude .. .. .. 34 0 0 .. .. .... .. .. .. 127 42 26 ... .. .. 128 29 34 ... .. .. .... .. .. .. 33 0 0 .. .. .... .. .. .. 129 14 35 ... .. .. 130 0 3 ... .. .. .... 126 2 52 32 0 0 10 3 3.3 0 126 -14 130 42 14 ... .. .. 131 26 13 ... .. .. .... 127 35 53 31 0 0 10 3 3.0 2 127 -15 132 5 53 ... .. .. 132 48 33 ... .. .. 0.19 129 4 17 30 0 0 10 3 2.2 4 128 -16 133 25 57 124 22 55 134 7 25 ... .. .. 0.20 130 28 35 29 0 0 10 3 1.0 5 129 -17 134 42 46 125 56 52 135 23 9 125 10 9 0.20 131 49 13 28 0 0 10 2 59.4 7 129 -18 135 56 38 127 26 5 136 36 3 126 41 0 0.20 133 6 33 27 0 0 10 2 57.5 8 130 -19 137 7 50 128 51 4 137 46 21 128 7 27 0.21 134 20 52 26 0 0 10 2 55.1 10 130 -20 138 16 35 130 12 18 138 54 16 129 29 58 0.21 135 32 28 25 0 0 10 2 52.5 11 131 -21 139 23 4 131 30 8 140 0 1 130 48 58 0.21 136 41 34 24 0 0 10 2 49.5 13 131 -21 140 27 30 132 44 53 141 3 46 132 4 47 0.21 137 48 23 23 0 0 10 2 46.2 14 132 -22 141 30 2 133 56 52 142 5 39 133 17 43 0.20 138 53 6 22 0 0 10 2 42.6 15 132 -23 142 30 48 135 6 18 143 5 50 134 28 2 0.20 139 55 53 21 0 0 10 2 38.7 17 132 -24 143 29 57 136 13 25 144 4 26 135 35 56 0.20 140 56 53 20 0 0 10 2 34.5 18 133 -24 144 27 35 137 18 23 145 1 34 136 41 37 0.20 141 56 14 19 0 0 10 2 30.1 20 133 -25 145 23 49 138 21 23 145 57 20 137 45 17 0.20 142 54 2 18 0 0 10 2 25.4 21 133 -25 146 18 45 139 22 34 146 51 50 138 47 5 0.20 143 50 26 17 0 0 10 2 20.4 22 134 -26 147 12 29 140 22 4 147 45 9 139 47 8 0.20 144 45 29 16 0 0 10 2 15.2 23 134 -27 148 5 5 141 20 0 148 37 23 140 45 36 0.20 145 39 19 15 0 0 10 2 9.8 25 134 -27 148 56 38 142 16 29 149 28 35 141 42 33 0.20 146 32 0 14 0 0 10 2 4.2 26 134 -28 149 47 12 143 11 37 150 18 50 142 38 8 0.20 147 23 37 13 0 0 10 1 58.3 27 134 -28 150 36 51 144 5 30 151 8 12 143 32 25 0.20 148 14 14 12 0 0 10 1 52.2 29 134 -29 151 25 40 144 58 13 151 56 44 144 25 30 0.20 149 3 55 11 0 0 10 1 45.9 30 134 -29 152 13 41 145 49 50 152 44 30 145 17 28 0.20 149 52 44 10 0 0 10 1 39.4 31 134 -29 153 0 58 146 40 26 153 31 33 146 8 24 0.20 150 40 45 9 0 0 10 1 32.7 32 134 -30 153 47 34 147 30 5 154 17 56 146 58 20 0.20 151 27 59 8 0 0 10 1 25.8 34 134 -30 154 33 31 148 18 50 155 3 41 147 47 22 0.20 152 14 32 7 0 0 10 1 18.7 35 134 -31 155 18 53 149 6 45 155 48 53 148 35 32 0.20 153 0 25 6 0 0 10 1 11.4 36 134 -31 156 3 41 149 53 54 156 33 32 149 22 54 0.20 153 45 42 5 0 0 10 1 4.0 37 134 -31 156 47 59 150 40 19 157 17 41 150 9 32 0.20 154 30 24 4 0 0 10 0 56.3 38 134 -32 157 31 49 151 26 4 158 1 23 150 55 28 0.20 155 14 34 3 0 0 10 0 48.5 40 134 -32 158 15 13 152 11 10 158 44 40 151 40 44 0.21 155 58 15 2 0 0 10 0 40.5 41 134 -32 158 58 13 152 55 42 159 27 35 152 25 25 0.21 156 41 30 1 0 0 10 0 32.4 42 134 -32 159 40 52 153 39 40 160 10 8 153 9 31 0.21 157 24 19 0 0 0 10 0 24.1 43 133 -32 160 23 10 154 23 7 160 52 22 153 53 6 0.21 158 6 45 - 1 0 0 10 0 15.6 44 133 -33 161 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121 -32 -14 3 40 -23 9 35 -13 20 18 -23 56 18 0.22 171 0 0 -20 0 33 9 57 10.1 65 119 -32 -15 31 42 -24 38 53 -14 48 15 -25 25 44 0.22 172 0 0 -21 28 32 9 56 54.2 67 117 -32 -16 59 17 -26 7 24 -16 15 47 -26 54 22 0.22 173 0 0 -22 55 47 9 56 38.4 68 114 -31 -18 26 18 -27 35 2 -17 42 47 -28 22 4 0.22 174 0 0 -24 22 12 9 56 22.5 69 111 -31 -19 52 38 -29 1 38 -19 9 6 -29 48 42 0.22 175 0 0 -25 47 38 9 56 6.6 71 108 -30 -21 18 9 -30 27 5 -20 34 39 -31 14 10 0.22 176 0 0 -27 11 59 9 55 50.8 72 104 -30 -22 42 45 -31 51 16 -21 59 17 -32 38 20 0.22 177 0 0 -28 35 10 9 55 35.2 73 100 -29 -24 6 19 -33 14 5 -23 22 55 -34 1 6 0.23 178 0 0 -29 57 2 9 55 19.7 74 96 -29 -25 28 45 -34 35 26 -24 45 27 -35 22 22 0.23 179 0 0 -31 17 32 9 55 4.3 75 90 -28 -26 49 58 -35 55 13 -26 6 47 -36 42 2 0.23 180 0 0 -32 36 35 9 54 49.2 75 85 -28 -28 9 52 -37 13 22 -27 26 49 -38 0 2 0.23 -179 0 0 -33 54 5 9 54 34.2 76 79 -27 -29 28 22 -38 29 49 -28 45 29 -39 16 17 0.23 -178 0 0 -35 9 58 9 54 19.6 76 72 -26 -30 45 25 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39 -65 11 44 -58 15 33 -65 44 0 0.23 - 43 0 0 -61 33 6 9 44 52.3 14 232 23 -58 20 7 -64 49 27 -57 48 40 -65 22 5 0.23 - 42 0 0 -61 7 39 9 44 50.8 14 231 24 -57 52 32 -64 26 15 -57 20 45 -64 59 16 0.23 - 41 0 0 -60 41 12 9 44 49.2 13 230 24 -57 23 52 -64 2 6 -56 51 44 -64 35 30 0.23 - 40 0 0 -60 13 41 9 44 47.7 12 230 25 -56 54 6 -63 36 57 -56 21 36 -64 10 46 0.23 - 39 0 0 -59 45 4 9 44 46.2 12 229 25 -56 23 10 -63 10 46 -55 50 18 -63 45 0 0.24 - 38 0 0 -59 15 19 9 44 44.8 11 228 26 -55 51 3 -62 43 31 -55 17 48 -63 18 10 0.24 - 37 0 0 -58 44 22 9 44 43.4 10 227 26 -55 17 40 -62 15 8 -54 44 2 -62 50 14 0.24 - 36 0 0 -58 12 12 9 44 42.1 9 226 27 -54 43 0 -61 45 35 -54 8 58 -62 21 8 0.24 - 35 0 0 -57 38 44 9 44 40.9 9 225 28 -54 7 0 -61 14 49 -53 32 33 -61 50 49 0.24 - 34 0 0 -57 3 57 9 44 39.7 8 224 28 -53 29 36 -60 42 47 -52 54 44 -61 19 15 0.24 - 33 0 0 -56 27 46 9 44 38.6 7 224 29 -52 50 45 -60 9 25 -52 15 28 -60 46 21 0.25 - 32 0 0 -55 50 9 9 44 37.6 6 223 29 -52 10 25 -59 34 40 -51 34 42 -60 12 6 0.25 - 31 0 0 -55 11 2 9 44 36.7 5 222 30 -51 28 33 -58 58 28 -50 52 23 -59 36 25 0.26 - 30 0 0 -54 30 22 9 44 36.0 4 221 31 -50 45 4 -58 20 47 -50 8 27 -58 59 14 0.27 - 29 0 0 -53 48 5 9 44 35.3 3 220 31 -49 59 56 -57 41 32 -49 22 51 -58 20 30 0.29 - 28 0 0 -53 4 9 9 44 34.8 3 220 32 .. .. .. -57 0 40 .. .. .. -57 40 10 0.31 - 27 0 0 -52 18 28 9 44 34.4 2 219 33 .. .. .. -56 18 7 .. .. .. -56 58 9 0.38 - 26 0 0 -51 31 0 9 44 34.2 1 218 33 .. .. .. -55 33 49 .. .. .. -56 14 23 0.70 - 25 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -54 47 41 .. .. .. -55 28 48 .... - 24 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -53 59 40 .. .. .. -54 41 21 .... - 23 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -53 9 43 .. .. .. -53 51 56 .... - 22 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -53 0 31 .... Uncertainty in time = +/- 5 secs Prediction of 2022 Dec 1.1 Data for the target star ------------------------ * name: UCAC4 300-013437 * constellation : Canis Major * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 42 37.8512 DE: -30 00 52.785 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 42 37.8511 DE: -30 00 52.786 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.5 * 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 ["]: 0.518 distance from Earth [AU]: 1.41560 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 date of fit: 2022 Nov 26 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): 0.052", 0.018", 88.937° remarks: * orbital elements for (2)Pallas : Mean anomaly = 349.3844459123 deg Arg. of pericenter = 310.8634078155 deg Long. of node = 172.9178531522 deg Inclination = 34.9271275288 deg Eccentricity = 0.2300456360 Semimajor axis = 2.7694962027 AU Perihelion dist = 2.1323856872 AU Mag: H = 4.12, G = 0.11 Epoch of elements : MJD 59960.41229167 TDT (2023 Jan 16.4123) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552022Nov26,47.54,2023,1,16,9.896798,-0.173468,-0.141804,-3.998517,4.889705,0.001517,0.004274,0.000001,0.000000 -163.1475,-30.0381,33.95,-20.95,False UCAC4 300-013437,6.71051421,-30.0146622,0.00,12.50,0.00,0.0,0,,6.72562608,-30.0380887,0.01,0.00,0,0,0 2,Pallas,7.59,532.0,1.4156,0,0,-1.912,30.39,,28.2,0 0,349.2963,2023,1,16,310.8634,172.9179,34.9271,0.23005,2.76950,2.13239,4.12,5.0,0.15 1.082,0.0523,0.0177,89,0.0426,Known errors,-1.00,-1,-1,-1 20230116_013437,59914.09 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 01, 02:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org