IOTA/IOTA-ES occultation update for (1047) Geisha / UCAC4 341-114789 event on 2024 Apr 11, 23:45 UT Visible from Summary ------- On 2024 Apr 11 UT, the 10.5367859901421 km diameter asteroid (1047) Geisha will occult a 10.9 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.52 mag to 16.41 mag (the magnitude of the asteroid) for at most 1.880 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: 95 * date and approx. time of event: 2024 Apr 11, 23:26 - 2024 Apr 12, 00:04 * geocentric midpoint of event [JD]: 2460412.49009492 * magnitude of target star: 10.90 * magnitude drop [mag]: 5.52 * estimated maximum duration [s]: 1.880 * Moon: 14 % sunlit, 157° distance * Sun: 114° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 0.44 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.003", 98°) * approx speed of asteroid's shadow [km/s]: 5.6917 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 341-114789 by 1047 Geisha on 2024 Apr 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 - 8 0 0 15 2 22 23 27 7.0 0 113 -61 14 59 13 15 5 30 14 56 28 15 8 15 .... - 7 0 0 14 37 46 23 27 7.2 1 113 -62 14 34 37 14 40 55 14 31 52 14 43 40 0.09 - 6 0 0 14 12 52 23 27 7.8 2 113 -63 14 9 43 14 16 1 14 6 57 14 18 47 0.03 - 5 0 0 13 47 40 23 27 8.8 3 113 -64 13 44 31 13 50 50 13 41 45 13 53 35 0.01 - 4 0 0 13 22 11 23 27 10.2 4 114 -65 13 19 2 13 25 21 13 16 16 13 28 7 0.00 - 3 0 0 12 56 25 23 27 12.0 5 114 -66 12 53 16 12 59 35 12 50 29 13 2 22 -0.01 - 2 0 0 12 30 23 23 27 14.2 7 114 -66 12 27 13 12 33 33 12 24 26 12 36 20 -0.01 - 1 0 0 12 4 5 23 27 16.8 8 114 -67 12 0 55 12 7 15 11 58 8 12 10 2 -0.02 0 0 0 11 37 31 23 27 19.8 9 115 -68 11 34 21 11 40 42 11 31 34 11 43 29 -0.02 1 0 0 11 10 43 23 27 23.2 10 115 -69 11 7 32 11 13 54 11 4 45 11 16 41 -0.02 2 0 0 10 43 40 23 27 27.1 11 115 -70 10 40 29 10 46 51 10 37 41 10 49 38 -0.02 3 0 0 10 16 23 23 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17 49 -0.03 151 0 0 -11 1 46 0 4 8.7 + 9 249 56 -11 4 52 -10 58 41 -11 7 34 -10 55 58 -0.03 152 0 0 -10 39 38 0 4 11.8 + 8 249 57 -10 42 44 -10 36 32 -10 45 26 -10 33 50 -0.03 153 0 0 -10 17 11 0 4 14.5 + 7 249 58 -10 20 17 -10 14 5 -10 23 0 -10 11 23 -0.03 154 0 0 - 9 54 27 0 4 16.8 + 6 249 59 - 9 57 34 - 9 51 21 -10 0 17 - 9 48 38 -0.02 155 0 0 - 9 31 26 0 4 18.7 + 5 249 60 - 9 34 33 - 9 28 19 - 9 37 16 - 9 25 36 -0.02 156 0 0 - 9 8 8 0 4 20.3 + 4 248 61 - 9 11 15 - 9 5 1 - 9 13 58 - 9 2 18 -0.01 157 0 0 - 8 44 34 0 4 21.4 + 3 248 62 - 8 47 41 - 8 41 27 - 8 50 25 - 8 38 43 0.00 158 0 0 - 8 20 44 0 4 22.2 + 2 248 63 - 8 23 52 - 8 17 37 - 8 26 36 - 8 14 53 0.03 159 0 0 - 7 56 40 0 4 22.5 + 0 248 64 - 7 59 47 - 7 53 32 - 8 2 32 - 7 50 48 0.20 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: UCAC4 341-114789 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 50 57.4644 DE: -21 53 14.858 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 50 57.4645 DE: -21 53 14.858 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.9 * B mag [mag]: 12.0 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1047) Geisha asteroid class: approx. diameter [km]: 11 approx. diameter ["]: 0.008 distance from Earth [AU]: 1.89190 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#50 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): 0.012", 0.003", 98.5° remarks: * orbital elements for (1047)Geisha : Mean anomaly = 245.7213127366 deg Arg. of pericenter = 300.3039637839 deg Long. of node = 78.1829441276 deg Inclination = 5.6652644997 deg Eccentricity = 0.1923415221 Semimajor axis = 2.2413964950 AU Perihelion dist = 1.8102828815 AU Mag: H = 12.00, G = 0.15 Epoch of elements : MJD 60411.99009479 TDT (2024 Apr 11.9901) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr24,1.88,2024,4,11,23.762278,0.014661,0.067269,3.139286,-0.682189,-0.005116,0.000002,0.000001,0.000000 70.9939,-21.8950,-176.23,8.78,False UCAC4 341-114789,17.84929565,-21.8874604,11.99,10.90,10.31,0.1,0,,17.87370328,-21.8950398,5.51,5.65,0,0,0 1047,Geisha,16.41,10.674,1.8919,0,0,1.049,-3.17,,1.0,0 0,245.4305,2024,4,11,300.3040,78.1829,5.6653,0.19234,2.24140,1.81028,12.00,5.0,0.15 1.438,0.0120,0.0033,98,0.0034,Known errors,0.66,0,-1,-1 20240411_114789,60139.29 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org