IOTA/IOTA-ES occultation update for (3171) Wang Shouguan / UCAC4 273-121854 event on 2023 May 28, 18:21 UT Visible from Australia, S Africa Summary ------- On 2023 May 28 UT, the 38.7 km diameter asteroid (3171) Wang Shouguan will occult a 12.4 mag star in the constellation Scorpius for observers along a path across Australia, S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.22 mag to 16.62 mag (the magnitude of the asteroid) for at most 2.900 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: 98 * date and approx. time of event: 2023 May 28, 18:13 - 2023 May 28, 18:29 * geocentric midpoint of event [JD]: 2460093.26510679 * magnitude of target star: 12.42 * magnitude drop [mag]: 4.22 * estimated maximum duration [s]: 2.900 * Moon: 61 % sunlit, 99° distance * Sun: 156° distance * rough path description: Australia, S Africa The occultation path -------------------- * approximate projected width [km]: 39 * 1 sigma uncertainty interval [path widths]: +/- 0.36 * 1 sigma uncertainty interval [seconds]: +/- 2.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.002", 98°) * approx speed of asteroid's shadow [km/s]: 13.3555 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 273-121854 by 3171 Wang Shouguan on 2023 May 28 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 6 0 0 -12 46 20 18 29 42.6 1 126 -18 -12 33 19 -12 59 20 -12 23 52 -13 8 47 .... 7 0 0 -13 29 9 18 29 42.3 2 126 -19 -13 16 11 -13 42 7 -13 6 46 -13 51 31 0.06 8 0 0 -14 11 25 18 29 41.9 3 126 -20 -13 58 30 -14 24 20 -13 49 7 -14 33 43 0.03 9 0 0 -14 53 7 18 29 41.2 5 126 -21 -14 40 15 -15 6 0 -14 30 54 -15 15 20 0.01 10 0 0 -15 34 15 18 29 40.3 6 125 -22 -15 21 25 -15 47 4 -15 12 7 -15 56 23 0.00 11 0 0 -16 14 47 18 29 39.2 7 125 -23 -16 2 0 -16 27 33 -15 52 44 -16 36 50 0.00 12 0 0 -16 54 42 18 29 37.9 8 125 -24 -16 41 59 -17 7 26 -16 32 45 -17 16 40 -0.01 13 0 0 -17 34 1 18 29 36.5 9 124 -25 -17 21 20 -17 46 41 -17 12 8 -17 55 53 -0.01 14 0 0 -18 12 42 18 29 34.9 10 124 -26 -18 0 4 -18 25 19 -17 50 54 -18 34 29 -0.01 15 0 0 -18 50 44 18 29 33.1 11 124 -28 -18 38 10 -19 3 19 -18 29 2 -19 12 26 -0.01 16 0 0 -19 28 8 18 29 31.1 13 123 -29 -19 15 37 -19 40 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1 4 6 0 37 28 1 13 46 0 27 49 -0.02 173 0 0 1 37 51 18 14 13.9 19 231 -2 1 51 11 1 24 32 2 0 51 1 14 52 -0.02 174 0 0 2 24 55 18 14 10.6 18 231 -1 2 38 15 2 11 36 2 47 55 2 1 56 -0.02 175 0 0 3 11 58 18 14 7.5 17 231 0 3 25 17 2 58 39 3 34 57 2 48 59 -0.02 176 0 0 3 58 57 18 14 4.6 15 232 2 4 12 16 3 45 38 4 21 56 3 35 58 -0.02 177 0 0 4 45 51 18 14 2.0 14 232 3 4 59 9 4 32 32 5 8 49 4 22 53 -0.02 178 0 0 5 32 37 18 13 59.6 13 232 4 5 45 55 5 19 19 5 55 35 5 9 40 -0.02 179 0 0 6 19 14 18 13 57.4 12 232 5 6 32 32 6 5 57 6 42 11 5 56 19 -0.02 180 0 0 7 5 41 18 13 55.4 10 232 6 7 18 58 6 52 24 7 28 36 6 42 46 -0.02 -179 0 0 7 51 55 18 13 53.7 9 232 8 8 5 11 7 38 39 8 14 48 7 29 2 -0.02 -178 0 0 8 37 54 18 13 52.2 8 232 9 8 51 9 8 24 40 9 0 46 8 15 3 -0.01 -177 0 0 9 23 37 18 13 50.9 7 232 10 9 36 51 9 10 24 9 46 27 9 0 48 -0.01 -176 0 0 10 9 3 18 13 49.8 5 233 11 10 22 15 9 55 51 10 31 49 9 46 16 0.00 -175 0 0 10 54 8 18 13 49.0 4 233 12 11 7 19 10 40 58 11 16 53 10 31 24 0.01 -174 0 0 11 38 53 18 13 48.4 3 233 14 11 52 2 11 25 44 12 1 34 11 16 12 0.02 -173 0 0 12 23 15 18 13 48.0 2 233 15 12 36 22 12 10 8 12 45 53 12 0 37 0.07 -172 0 0 13 7 12 18 13 47.8 0 233 16 13 20 18 12 54 7 13 29 48 12 44 38 0.34 Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 273-121854 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 48 28.2517 DE: -35 26 29.514 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 48 28.2517 DE: -35 26 29.514 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.4 * 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 ["]: 0.020 distance from Earth [AU]: 2.63690 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): 0.018", 0.002", 97.737° remarks: * orbital elements for (3171)Wang Shouguan : Mean anomaly = 213.1601612005 deg Arg. of pericenter = 25.4216099351 deg Long. of node = 31.7103747081 deg Inclination = 11.4241259553 deg Eccentricity = 0.1466243223 Semimajor axis = 3.1797576935 AU Perihelion dist = 2.7135278765 AU Mag: H = 11.26, G = 0.15 Epoch of elements : MJD 60092.76506945 TDT (2023 May 28.7651) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#612023Apr24,2.90,2023,5,28,18.362563,-0.003345,0.011991,-7.257762,-2.037016,-0.001980,0.001152,0.000001,0.000000 106.0417,-35.4493,-96.11,21.51,False UCAC4 273-121854,17.80784769,-35.4415315,0.00,12.42,0.00,0.0,0,,17.83422078,-35.4493188,4.22,0.00,0,0,1 3171,Wang Shouguan,16.62,38.7,2.6369,0,0,-1.981,-6.79,,2.6,0 0,213.0272,2023,5,28,25.4216,31.7104,11.4241,0.14662,3.17976,2.71353,11.24,5.0,0.15 1.363,0.0180,0.0018,98,0.0073,Known errors,-1.00,-1,-1,-1 20230528_121854,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org