IOTA/IOTA-ES occultation update for (2185) Guangdong / UCAC4 592-017163 event on 2024 Apr 13, 19:23 UT Visible from Summary ------- On 2024 Apr 13 UT, the 14.922 km diameter asteroid (2185) Guangdong will occult a 11.9 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.63 mag to 17.50 mag (the magnitude of the asteroid) for at most 0.470 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: 99 * date and approx. time of event: 2024 Apr 13, 19:20 - 2024 Apr 13, 19:26 * geocentric midpoint of event [JD]: 2460414.30799909 * magnitude of target star: 11.88 * magnitude drop [mag]: 5.63 * estimated maximum duration [s]: 0.470 * Moon: 30 % sunlit, 9° distance * Sun: 57° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 0.29 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.001", 77°) * approx speed of asteroid's shadow [km/s]: 31.6391 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 592-017163 by 2185 Guangdong on 2024 Apr 13 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 -157 0 0 26 5 12 19 20 44.3 0 58 43 25 59 26 26 10 59 25 56 8 26 14 17 .... -156 0 0 26 39 0 19 20 44.3 1 59 43 26 33 13 26 44 48 26 29 55 26 48 7 -0.57 -155 0 0 27 13 0 19 20 44.5 2 59 44 27 7 12 27 18 49 27 3 53 27 22 9 -0.62 -154 0 0 27 47 11 19 20 44.7 3 60 45 27 41 21 27 53 0 27 38 2 27 56 21 -0.64 -153 0 0 28 21 30 19 20 45.0 5 60 46 28 15 40 28 27 21 28 12 20 28 30 42 -0.65 -152 0 0 28 55 58 19 20 45.4 6 61 46 28 50 7 29 1 50 28 46 47 29 5 11 -0.66 -151 0 0 29 30 33 19 20 45.9 7 61 47 29 24 41 29 36 26 29 21 20 29 39 48 -0.66 -150 0 0 30 5 14 19 20 46.5 8 62 47 29 59 21 30 11 8 29 56 0 30 14 30 -0.67 -149 0 0 30 40 0 19 20 47.1 9 62 48 30 34 6 30 45 54 30 30 44 30 49 17 -0.67 -148 0 0 31 14 49 19 20 47.8 10 63 49 31 8 54 31 20 44 31 5 31 31 24 7 -0.67 -147 0 0 31 49 39 19 20 48.6 11 63 49 31 43 44 31 55 35 31 40 21 31 58 59 -0.67 -146 0 0 32 24 31 19 20 49.5 12 64 50 32 18 35 32 30 28 32 15 12 32 33 52 -0.67 -145 0 0 32 59 22 19 20 50.4 13 64 50 32 53 26 33 5 20 32 50 2 33 8 44 -0.67 -144 0 0 33 34 12 19 20 51.4 14 65 51 33 28 15 33 40 10 33 24 50 33 43 35 -0.68 -143 0 0 34 8 59 19 20 52.5 15 66 51 34 3 1 34 14 57 33 59 36 34 18 22 -0.68 -142 0 0 34 43 41 19 20 53.6 16 66 51 34 37 43 34 49 40 34 34 18 34 53 5 -0.68 -141 0 0 35 18 18 19 20 54.8 17 67 52 35 12 19 35 24 17 35 8 54 35 27 43 -0.68 -140 0 0 35 52 48 19 20 56.1 18 68 52 35 46 49 35 58 48 35 43 24 36 2 14 -0.68 -139 0 0 36 27 11 19 20 57.4 19 68 52 36 21 11 36 33 11 36 17 46 36 36 37 -0.68 -138 0 0 37 1 24 19 20 58.8 20 69 53 36 55 25 37 7 25 36 51 59 37 10 51 -0.68 -137 0 0 37 35 28 19 21 0.2 21 70 53 37 29 28 37 41 28 37 26 2 37 44 55 -0.68 -136 0 0 38 9 20 19 21 1.7 22 70 53 38 3 19 38 15 20 37 59 53 38 18 47 -0.68 -135 0 0 38 42 59 19 21 3.3 22 71 53 38 36 59 38 49 0 38 33 33 38 52 27 -0.68 -134 0 0 39 16 25 19 21 4.9 23 72 53 39 10 25 39 22 26 39 6 59 39 25 53 -0.68 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0 0 40 44 36 19 26 12.0 13 296 -35 40 38 36 40 50 37 40 35 10 40 54 3 -0.73 45 0 0 40 11 59 19 26 12.9 12 297 -36 40 5 58 40 17 59 40 2 33 40 21 26 -0.73 46 0 0 39 39 5 19 26 13.7 11 298 -37 39 33 5 39 45 6 39 29 39 39 48 32 -0.73 47 0 0 39 5 57 19 26 14.4 10 298 -38 38 59 56 39 11 57 38 56 31 39 15 24 -0.74 48 0 0 38 32 34 19 26 15.1 9 299 -38 38 26 34 38 38 34 38 23 8 38 42 1 -0.74 49 0 0 37 58 58 19 26 15.7 8 300 -39 37 52 59 38 4 59 37 49 33 38 8 25 -0.75 50 0 0 37 25 11 19 26 16.2 7 300 -40 37 19 11 37 31 11 37 15 46 37 34 37 -0.76 51 0 0 36 51 12 19 26 16.7 6 301 -41 36 45 13 36 57 12 36 41 48 37 0 39 -0.78 52 0 0 36 17 4 19 26 17.1 5 302 -42 36 11 5 36 23 4 36 7 40 36 26 30 -0.80 53 0 0 35 42 48 19 26 17.5 4 302 -43 35 36 49 35 48 47 35 33 24 35 52 13 -0.82 54 0 0 35 8 24 19 26 17.7 3 303 -43 35 2 26 35 14 23 34 59 1 35 17 48 -0.87 55 0 0 34 33 54 19 26 17.9 2 303 -44 34 27 56 34 39 52 34 24 32 34 43 17 -0.96 56 0 0 33 59 19 19 26 18.1 1 304 -45 33 53 22 34 5 17 33 49 58 34 8 42 -1.23 57 0 0 33 24 40 19 26 18.1 0 304 -46 .. .. .. 33 30 37 .. .. .. 33 34 2 -30.65 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: UCAC4 592-017163 * constellation : Taurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 05 20 13.4894 DE: +28 15 12.906 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 05 20 13.4893 DE: +28 15 12.906 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2185) Guangdong asteroid class: approx. diameter [km]: 15 approx. diameter ["]: 0.006 distance from Earth [AU]: 3.39940 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#52 date of fit: 2023 Apr 27 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): 0.011", 0.001", 77.2° remarks: * orbital elements for (2185)Guangdong : Mean anomaly = 121.0790032550 deg Arg. of pericenter = 262.2760080746 deg Long. of node = 60.5344701656 deg Inclination = 9.6017141280 deg Eccentricity = 0.1619249315 Semimajor axis = 2.7082597475 AU Perihelion dist = 2.2697249735 AU Mag: H = 11.59, G = 0.15 Epoch of elements : MJD 60413.80799870 TDT (2024 Apr 13.8080) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr27,0.47,2024,4,13,19.391978,-0.043767,0.557511,17.804565,1.380311,0.004808,0.000599,-0.000001,0.000000 -52.9154,28.2791,-110.79,9.44,False UCAC4 592-017163,5.33708042,28.2535850,12.68,11.88,11.45,0.0,0,,5.36224488,28.2790962,5.63,5.61,0,0,0 2185,Guangdong,17.50,14.922,3.3994,0,0,3.487,3.57,,1.2,0 0,120.9003,2024,4,13,262.2760,60.5345,9.6017,0.16192,2.70826,2.26972,11.59,5.0,0.15 1.286,0.0107,0.0008,77,0.0017,Known errors,1.35,0,-1,-1 20240413_017163,60139.29 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org