IOTA/IOTA-ES occultation update for (1960) Guisan / UCAC4 304-096617 event on 2024 Oct 13, 21:48 UT Visible from Summary ------- On 2024 Oct 13 UT, the 27.04 km diameter asteroid (1960) Guisan will occult a 11.9 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.16 mag to 17.05 mag (the magnitude of the asteroid) for at most 0.720 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 Oct 13, 21:45 - 2024 Oct 13, 21:51 * geocentric midpoint of event [JD]: 2460597.40853729 * magnitude of target star: 11.90 * magnitude drop [mag]: 5.16 * estimated maximum duration [s]: 0.720 * Moon: 82 % sunlit, 76° distance * Sun: 54° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 27 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.002", 103°) * approx speed of asteroid's shadow [km/s]: 37.7304 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 304-096617 by 1960 Guisan on 2024 Oct 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 -179 0 0 12 59 13 21 45 31.1 1 120 54 12 50 37 13 7 49 12 47 32 13 10 54 .... -178 0 0 12 24 58 21 45 31.1 2 120 55 12 16 22 12 33 34 12 13 16 12 36 39 -0.02 -177 0 0 11 50 36 21 45 31.3 3 121 56 11 42 0 11 59 12 11 38 54 12 2 18 -0.07 -176 0 0 11 16 8 21 45 31.5 4 121 58 11 7 32 11 24 44 11 4 26 11 27 50 -0.10 -175 0 0 10 41 35 21 45 31.8 5 121 59 10 32 59 10 50 12 10 29 54 10 53 18 -0.11 -174 0 0 10 6 59 21 45 32.1 6 121 60 9 58 23 10 15 35 9 55 17 10 18 41 -0.12 -173 0 0 9 32 20 21 45 32.5 7 121 61 9 23 44 9 40 56 9 20 38 9 44 2 -0.13 -172 0 0 8 57 39 21 45 33.0 9 122 62 8 49 4 9 6 15 8 45 58 9 9 21 -0.13 -171 0 0 8 22 58 21 45 33.5 10 122 63 8 14 22 8 31 34 8 11 17 8 34 40 -0.14 -170 0 0 7 48 17 21 45 34.1 11 122 64 7 39 42 7 56 53 7 36 37 7 59 59 -0.14 -169 0 0 7 13 38 21 45 34.8 12 122 65 7 5 3 7 22 14 7 1 58 7 25 19 -0.14 -168 0 0 6 39 2 21 45 35.6 13 122 67 6 30 27 6 47 37 6 27 22 6 50 42 -0.14 -167 0 0 6 4 29 21 45 36.4 14 122 68 5 55 55 6 13 4 5 52 50 6 16 9 -0.15 -166 0 0 5 30 1 21 45 37.3 16 122 69 5 21 27 5 38 35 5 18 22 5 41 40 -0.15 -165 0 0 4 55 39 21 45 38.2 17 123 70 4 47 6 5 4 13 4 44 1 5 7 18 -0.15 -164 0 0 4 21 24 21 45 39.3 18 123 71 4 12 51 4 29 57 4 9 47 4 33 2 -0.15 -163 0 0 3 47 17 21 45 40.3 19 123 72 3 38 44 3 55 49 3 35 40 3 58 54 -0.15 -162 0 0 3 13 19 21 45 41.5 20 123 73 3 4 47 3 21 50 3 1 43 3 24 55 -0.15 -161 0 0 2 39 30 21 45 42.7 21 123 75 2 30 59 2 48 2 2 27 56 2 51 6 -0.15 -160 0 0 2 5 53 21 45 44.0 22 123 76 1 57 23 2 14 24 1 54 19 2 17 27 -0.15 -159 0 0 1 32 28 21 45 45.3 24 123 77 1 23 58 1 40 58 1 20 55 1 44 1 -0.15 -158 0 0 0 59 16 21 45 46.7 25 123 78 0 50 47 1 7 44 0 47 44 1 10 48 -0.16 -157 0 0 0 26 17 21 45 48.2 26 123 79 0 17 49 0 34 45 0 14 47 0 37 48 -0.16 -156 0 0 - 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5 46 3 - 5 23 36 -0.16 - 27 0 0 - 5 5 41 21 50 55.4 19 241 -33 - 5 13 57 - 4 57 24 - 5 16 55 - 4 54 26 -0.16 - 26 0 0 - 4 36 9 21 50 56.4 17 241 -34 - 4 44 26 - 4 27 51 - 4 47 25 - 4 24 52 -0.16 - 25 0 0 - 4 6 15 21 50 57.4 16 241 -35 - 4 14 33 - 3 57 56 - 4 17 33 - 3 54 57 -0.16 - 24 0 0 - 3 36 0 21 50 58.3 15 241 -36 - 3 44 19 - 3 27 40 - 3 47 19 - 3 24 40 -0.16 - 23 0 0 - 3 5 23 21 50 59.1 14 241 -37 - 3 13 44 - 2 57 2 - 3 16 44 - 2 54 2 -0.16 - 22 0 0 - 2 34 27 21 50 59.9 13 241 -38 - 2 42 49 - 2 26 5 - 2 45 50 - 2 23 5 -0.16 - 21 0 0 - 2 3 12 21 51 0.7 12 241 -39 - 2 11 35 - 1 54 49 - 2 14 36 - 1 51 48 -0.16 - 20 0 0 - 1 31 38 21 51 1.3 11 240 -40 - 1 40 2 - 1 23 14 - 1 43 3 - 1 20 13 -0.16 - 19 0 0 - 0 59 46 21 51 1.9 10 240 -42 - 1 8 11 - 0 51 21 - 1 11 13 - 0 48 20 -0.16 - 18 0 0 - 0 27 38 21 51 2.4 8 240 -43 - 0 36 4 - 0 19 12 - 0 39 5 - 0 16 10 -0.16 - 17 0 0 0 4 47 21 51 2.9 7 240 -44 - 0 3 40 0 13 14 - 0 6 42 0 16 16 -0.16 - 16 0 0 0 37 27 21 51 3.3 6 240 -45 0 28 59 0 45 54 0 25 57 0 48 57 -0.15 - 15 0 0 1 10 21 21 51 3.6 5 241 -46 1 1 52 1 18 49 0 58 49 1 21 52 -0.15 - 14 0 0 1 43 28 21 51 3.9 4 241 -47 1 34 59 1 51 57 1 31 56 1 55 1 -0.15 - 13 0 0 2 16 48 21 51 4.1 3 241 -48 2 8 18 2 25 18 2 5 15 2 28 22 -0.14 - 12 0 0 2 50 19 21 51 4.2 2 241 -49 2 41 49 2 58 50 2 38 45 3 1 54 -0.12 - 11 0 0 3 24 1 21 51 4.3 0 241 -50 3 15 30 3 32 33 3 12 26 3 35 37 -0.02 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 304-096617 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 47 06.8017 DE: -29 12 10.688 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 47 06.8016 DE: -29 12 10.688 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 11.9 * B mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1960) Guisan asteroid class: approx. diameter [km]: 27 approx. diameter ["]: 0.014 distance from Earth [AU]: 2.66250 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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): 0.011", 0.002", 103.428° remarks: * orbital elements for (1960)Guisan : Mean anomaly = 352.2106209674 deg Arg. of pericenter = 263.4413664347 deg Long. of node = 22.1431113982 deg Inclination = 8.4750239700 deg Eccentricity = 0.1222924089 Semimajor axis = 2.5266912525 AU Perihelion dist = 2.2176960927 AU Mag: H = 12.15, G = 0.15 Epoch of elements : MJD 60596.90853721 TDT (2024 Oct 13.9085) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,0.72,2024,10,13,21.804895,0.015878,0.167354,21.196861,-2.053565,0.004301,-0.000922,-0.000001,0.000000 -97.8521,-29.2482,-150.56,-8.22,False UCAC4 304-096617,16.78522275,-29.2029691,12.19,11.90,11.74,0.0,0,,16.81093359,-29.2482053,5.16,4.87,0,0,0 1960,Guisan,17.05,27.040,2.6625,0,0,5.350,-6.78,,1.4,0 0,351.9877,2024,10,13,263.4414,22.1431,8.4750,0.12229,2.52669,2.21770,12.15,5.0,0.15 1.180,0.0110,0.0020,103,0.0025,Known errors,1.72,0,-1,-1 20241013_096617,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org