IOTA/IOTA-ES occultation update for (3171) Wang Shouguan / UCAC4 280-156742 event on 2023 May 03, 21:08 UT Visible from Australia Summary ------- On 2023 May 03 UT, the 38.7 km diameter asteroid (3171) Wang Shouguan will occult a 11.6 mag star in the constellation Sagittarius 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 5.43 mag to 17.03 mag (the magnitude of the asteroid) for at most 5.110 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: 79 * date and approx. time of event: 2023 May 03, 20:55 - 2023 May 03, 21:22 * geocentric midpoint of event [JD]: 2460068.38105112 * magnitude of target star: 11.61 * magnitude drop [mag]: 5.43 * estimated maximum duration [s]: 5.110 * Moon: 96 % sunlit, 71° distance * Sun: 131° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 41 * 1 sigma uncertainty interval [path widths]: +/- 0.70 * 1 sigma uncertainty interval [seconds]: +/- 2.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.002", 95°) * approx speed of asteroid's shadow [km/s]: 7.5799 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 280-156742 by 3171 Wang Shouguan on 2023 May 3 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 - 50 0 0 -48 55 38 21 22 3.8 0 147 -13 -48 35 40 -49 15 40 .. .. .. -49 43 38 .... - 49 0 0 -49 55 52 21 22 3.4 2 146 -13 -49 36 7 -50 15 40 -49 8 45 -50 43 18 0.28 - 48 0 0 -50 53 53 21 22 2.7 3 145 -14 -50 34 23 -51 13 27 -50 7 20 -51 40 47 0.28 - 47 0 0 -51 49 47 21 22 1.6 4 145 -15 -51 30 30 -52 9 7 -51 3 46 -52 36 6 0.28 - 46 0 0 -52 43 34 21 22 0.3 5 144 -16 -52 24 32 -53 2 40 -51 58 7 -53 29 21 0.28 - 45 0 0 -53 35 20 21 21 58.7 6 143 -16 -53 16 32 -53 54 12 -52 50 26 -54 20 33 0.28 - 44 0 0 -54 25 8 21 21 56.8 7 142 -17 -54 6 33 -54 43 46 -53 40 47 -55 9 47 0.28 - 43 0 0 -55 13 1 21 21 54.8 8 141 -18 -54 54 40 -55 31 25 -54 29 14 -55 57 6 0.28 - 42 0 0 -55 59 4 21 21 52.6 9 141 -18 -55 40 57 -56 17 13 -55 15 49 -56 42 35 0.28 - 41 0 0 -56 43 19 21 21 50.2 10 140 -19 -56 25 26 -57 1 15 -56 0 37 -57 26 17 0.29 - 40 0 0 -57 25 51 21 21 47.7 11 139 -19 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- 0 17 33 - 0 53 12 0 7 10 - 1 18 5 0.28 144 0 0 0 42 34 20 57 37.1 33 228 9 1 0 12 0 24 53 1 24 40 0 0 14 0.28 145 0 0 1 59 15 20 57 24.3 31 228 10 2 16 43 1 41 45 2 40 57 1 17 20 0.28 146 0 0 3 14 40 20 57 12.2 29 228 12 3 31 57 2 57 21 3 55 57 2 33 11 0.28 147 0 0 4 28 46 20 57 0.7 28 227 13 4 45 53 4 11 37 5 9 38 3 47 42 0.28 148 0 0 5 41 30 20 56 50.0 26 227 14 5 58 26 5 24 32 6 21 57 5 0 51 0.28 149 0 0 6 52 50 20 56 39.9 25 227 15 7 9 35 6 36 2 7 32 52 6 12 36 0.28 150 0 0 8 2 43 20 56 30.5 23 227 16 8 19 18 7 46 6 8 42 20 7 22 55 0.28 151 0 0 9 11 8 20 56 21.7 22 228 18 9 27 33 8 54 42 9 50 20 8 31 46 0.28 152 0 0 10 18 5 20 56 13.6 20 228 19 10 34 19 10 1 49 10 56 52 9 39 7 0.28 153 0 0 11 23 30 20 56 6.1 19 228 20 11 39 34 11 7 25 12 1 53 10 44 58 0.28 154 0 0 12 27 25 20 55 59.3 18 228 21 12 43 19 12 11 30 13 5 23 11 49 18 0.29 155 0 0 13 29 48 20 55 53.0 16 228 22 13 45 31 13 14 3 14 7 21 12 52 5 0.29 156 0 0 14 30 39 20 55 47.3 15 228 23 14 46 12 14 15 4 15 7 48 13 53 20 0.29 157 0 0 15 29 57 20 55 42.2 13 228 25 15 45 21 15 14 33 16 6 43 14 53 3 0.29 158 0 0 16 27 44 20 55 37.7 12 229 26 16 42 58 16 12 29 17 4 6 15 51 14 0.29 159 0 0 17 23 59 20 55 33.6 11 229 27 17 39 3 17 8 54 17 59 58 16 47 52 0.30 160 0 0 18 18 43 20 55 30.1 10 229 28 18 33 37 18 3 48 18 54 19 17 42 59 0.30 161 0 0 19 11 56 20 55 27.1 8 230 29 19 26 41 18 57 10 19 47 10 18 36 35 0.31 162 0 0 20 3 40 20 55 24.5 7 230 30 20 18 15 19 49 3 20 38 31 19 28 41 0.32 163 0 0 20 53 54 20 55 22.5 6 230 31 21 8 20 20 39 27 21 28 24 20 19 17 0.33 164 0 0 21 42 41 20 55 20.8 5 231 32 21 56 58 21 28 22 22 16 49 21 8 25 0.34 165 0 0 22 30 1 20 55 19.6 3 231 33 22 44 9 22 15 51 23 3 48 21 56 6 0.37 166 0 0 23 15 55 20 55 18.7 2 231 34 23 29 55 23 1 53 23 49 22 22 42 21 0.42 167 0 0 24 0 24 20 55 18.3 1 232 35 24 14 16 23 46 32 24 33 32 23 27 11 0.61 168 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 24 10 37 .... Uncertainty in time = +/- 4 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 280-156742 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 02 21.8106 DE: -34 01 24.136 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 02 21.8112 DE: -34 01 24.137 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3171) Wang Shouguan asteroid class: approx. diameter [km]: 39 approx. diameter ["]: 0.019 distance from Earth [AU]: 2.85370 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#61 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): 0.016", 0.002", 95.449° remarks: * orbital elements for (3171)Wang Shouguan : Mean anomaly = 208.8397091395 deg Arg. of pericenter = 25.4167873184 deg Long. of node = 31.7103717660 deg Inclination = 11.4241256092 deg Eccentricity = 0.1466019626 Semimajor axis = 3.1798297633 AU Perihelion dist = 2.7136604792 AU Mag: H = 11.26, G = 0.15 Epoch of elements : MJD 60067.88090278 TDT (2023 May 03.8809) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#612023Apr24,5.11,2023,5,3,21.145227,0.215622,-0.201994,-2.911053,-3.135246,-0.004259,0.000686,0.000001,0.000000 92.2941,-34.0230,-137.96,15.79,False UCAC4 280-156742,18.03939183,-34.0233710,0.00,11.61,0.00,0.0,0,,18.06523677,-34.0229602,5.43,0.00,0,0,0 3171,Wang Shouguan,17.03,38.7,2.8537,0,0,-0.722,-9.66,,2.6,0 0,208.6866,2023,5,3,25.4168,31.7104,11.4241,0.14660,3.17983,2.71366,11.24,5.0,0.15 1.696,0.0163,0.0017,95,0.0130,Known errors,-1.00,-1,-1,-1 20230503_156742,60063.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org