IOTA/IOTA-ES occultation update for (3701) Purkyne / UCAC4 350-161806 event on 2024 Apr 04, 02:12 UT Visible from Summary ------- On 2024 Apr 04 UT, the 8.9207566856099 km diameter asteroid (3701) Purkyne will occult a 11.3 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 6.93 mag to 18.21 mag (the magnitude of the asteroid) for at most 0.770 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 04, 02:05 - 2024 Apr 04, 02:19 * geocentric midpoint of event [JD]: 2460404.59197275 * magnitude of target star: 11.28 * magnitude drop [mag]: 6.93 * estimated maximum duration [s]: 0.770 * Moon: 28 % sunlit, 29° distance * Sun: 92° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.002", 90°) * approx speed of asteroid's shadow [km/s]: 15.0793 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 350-161806 by 3701 Purkyne on 2024 Apr 4 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 - 31 0 0 - 1 35 30 2 5 24.3 0 110 -86 - 1 38 50 - 1 32 9 - 1 40 58 - 1 30 1 - 1 37 21 - 1 33 38 .... - 30 0 0 - 1 57 24 2 5 24.5 1 110 -86 - 2 0 45 - 1 54 3 - 2 2 52 - 1 51 56 - 1 59 15 - 1 55 33 0.05 - 29 0 0 - 2 19 11 2 5 24.7 2 110 -86 - 2 22 32 - 2 15 51 - 2 24 39 - 2 13 43 - 2 21 3 - 2 17 20 0.01 - 28 0 0 - 2 40 51 2 5 25.1 4 110 -86 - 2 44 11 - 2 37 30 - 2 46 19 - 2 35 23 - 2 42 42 - 2 39 0 -0.01 - 27 0 0 - 3 2 23 2 5 25.7 5 110 -85 - 3 5 43 - 2 59 2 - 3 7 50 - 2 56 55 - 3 4 14 - 3 0 31 -0.02 - 26 0 0 - 3 23 46 2 5 26.4 6 110 -85 - 3 27 6 - 3 20 26 - 3 29 13 - 3 18 18 - 3 25 37 - 3 21 55 -0.03 - 25 0 0 - 3 45 0 2 5 27.2 7 110 -84 - 3 48 20 - 3 41 40 - 3 50 27 - 3 39 33 - 3 46 51 - 3 43 9 -0.03 - 24 0 0 - 4 6 5 2 5 28.2 8 110 -83 - 4 9 25 - 4 2 45 - 4 11 32 - 4 0 38 - 4 7 56 - 4 4 14 -0.04 - 23 0 0 - 4 27 0 2 5 29.4 9 110 -82 - 4 30 19 - 4 23 40 - 4 32 26 - 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1 0 4 - 0 53 21 - 1 2 12 - 0 51 13 - 0 58 34 - 0 54 50 -0.05 118 0 0 - 0 34 9 2 18 44.5 26 248 61 - 0 37 31 - 0 30 48 - 0 39 39 - 0 28 40 - 0 36 1 - 0 32 18 -0.05 119 0 0 - 0 11 31 2 18 48.0 25 248 62 - 0 14 53 - 0 8 10 - 0 17 1 - 0 6 1 - 0 13 23 - 0 9 39 -0.05 120 0 0 0 11 12 2 18 51.4 24 248 63 0 7 50 0 14 33 0 5 42 0 16 42 0 9 20 0 13 4 -0.05 121 0 0 0 33 59 2 18 54.6 23 248 64 0 30 37 0 37 20 0 28 29 0 39 29 0 32 7 0 35 51 -0.05 122 0 0 0 56 50 2 18 57.6 22 248 66 0 53 28 1 0 11 0 51 19 1 2 20 0 54 58 0 58 42 -0.05 123 0 0 1 19 44 2 19 0.5 21 248 67 1 16 22 1 23 5 1 14 13 1 25 14 1 17 51 1 21 36 -0.05 124 0 0 1 42 40 2 19 3.3 20 248 68 1 39 18 1 46 2 1 37 10 1 48 10 1 40 48 1 44 32 -0.05 125 0 0 2 5 39 2 19 6.0 19 248 69 2 2 17 2 9 1 2 0 8 2 11 9 2 3 47 2 7 31 -0.05 126 0 0 2 28 39 2 19 8.4 18 248 70 2 25 17 2 32 1 2 23 8 2 34 9 2 26 47 2 30 31 -0.05 127 0 0 2 51 40 2 19 10.8 17 248 71 2 48 18 2 55 2 2 46 9 2 57 10 2 49 47 2 53 32 -0.05 128 0 0 3 14 41 2 19 13.0 15 248 72 3 11 19 3 18 3 3 9 10 3 20 11 3 12 49 3 16 33 -0.05 129 0 0 3 37 42 2 19 15.0 14 248 73 3 34 20 3 41 4 3 32 11 3 43 12 3 35 50 3 39 34 -0.05 130 0 0 4 0 42 2 19 16.9 13 248 74 3 57 20 4 4 4 3 55 11 4 6 12 3 58 50 4 2 34 -0.05 131 0 0 4 23 41 2 19 18.7 12 248 75 4 20 19 4 27 3 4 18 10 4 29 11 4 21 49 4 25 33 -0.05 132 0 0 4 46 38 2 19 20.3 11 249 76 4 43 16 4 50 0 4 41 7 4 52 8 4 44 45 4 48 30 -0.05 133 0 0 5 9 32 2 19 21.8 10 249 77 5 6 10 5 12 54 5 4 2 5 15 2 5 7 40 5 11 24 -0.05 134 0 0 5 32 24 2 19 23.1 9 249 78 5 29 2 5 35 45 5 26 53 5 37 54 5 30 32 5 34 16 -0.05 135 0 0 5 55 12 2 19 24.3 8 249 79 5 51 50 5 58 33 5 49 41 6 0 42 5 53 20 5 57 4 -0.04 136 0 0 6 17 56 2 19 25.3 7 249 80 6 14 34 6 21 17 6 12 26 6 23 26 6 16 4 6 19 48 -0.04 137 0 0 6 40 35 2 19 26.2 6 249 81 6 37 13 6 43 57 6 35 5 6 46 5 6 38 43 6 42 27 -0.04 138 0 0 7 3 9 2 19 26.9 5 249 82 6 59 48 7 6 31 6 57 39 7 8 39 7 1 17 7 5 1 -0.04 139 0 0 7 25 38 2 19 27.5 4 249 83 7 22 16 7 28 59 7 20 8 7 31 8 7 23 46 7 27 30 -0.03 140 0 0 7 48 1 2 19 27.9 3 249 84 7 44 39 7 51 22 7 42 31 7 53 30 7 46 9 7 49 52 -0.02 141 0 0 8 10 17 2 19 28.2 2 250 85 8 6 55 8 13 38 8 4 47 8 15 46 8 8 25 8 12 8 0.00 142 0 0 8 32 25 2 19 28.3 1 250 85 8 29 4 8 35 47 8 26 56 8 37 55 8 30 34 8 34 17 0.12 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: UCAC4 350-161806 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 52 26.4790 DE: -20 02 02.089 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 52 26.4791 DE: -20 02 02.089 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.500,0.400) * V mag [mag]: 11.3 * B mag [mag]: 13.8 * Diameter [mas]: 1.30 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3701) Purkyne asteroid class: approx. diameter [km]: 9 approx. diameter ["]: 0.004 distance from Earth [AU]: 2.81300 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#48 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", 0.001", 89.7° remarks: * orbital elements for (3701)Purkyne : Mean anomaly = 212.2039555746 deg Arg. of pericenter = 300.2411505228 deg Long. of node = 115.4972436683 deg Inclination = 4.9226481989 deg Eccentricity = 0.0909666194 Semimajor axis = 2.7992249495 AU Perihelion dist = 2.5445889190 AU Mag: H = 12.59, G = 0.15 Epoch of elements : MJD 60404.09197258 TDT (2024 Apr 04.0920) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#482023Apr24,0.77,2024,4,4,2.207346,-0.006016,0.066622,8.473413,0.800873,-0.005791,-0.000545,0.000000,0.000000 57.4649,-20.0058,147.63,5.83,False UCAC4 350-161806,18.87402193,-20.0339135,13.84,11.28,9.90,1.3,4,,18.89786158,-20.0057644,6.94,7.87,0,0,0 3701,Purkyne,18.21,11.573,2.8130,0,0,1.880,2.50,,1.0,0 0,212.1846,2024,4,4,300.2412,115.4972,4.9226,0.09097,2.79922,2.54459,12.59,5.0,0.15 1.318,0.0110,0.0015,90,0.0018,Known errors,1.09,0,-1,-1 20240404_161806,60139.27 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org