IOTA/IOTA-ES occultation update for (5011) Ptah / G181825.8-363938 event on 2024 Jun 17, 08:10 UT Visible from Summary ------- On 2024 Jun 17 UT, the 1.49765752740189 km diameter asteroid (5011) Ptah will occult a 13.4 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 6.01 mag to 19.41 mag (the magnitude of the asteroid) for at most 0.190 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: 8 * date and approx. time of event: 2024 Jun 17, 08:03 - 2024 Jun 17, 08:17 * geocentric midpoint of event [JD]: 2460478.84051721 * magnitude of target star: 13.40 * magnitude drop [mag]: 6.01 * estimated maximum duration [s]: 0.190 * Moon: 78 % sunlit, 64° distance * Sun: 165° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 3 * 1 sigma uncertainty interval [path widths]: +/- 8.40 * 1 sigma uncertainty interval [seconds]: +/- 2.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.039, +/- 0.027) * 1 sigma uncertainty ellipse (major, minor, PA): (0.039", 0.027", 85°) * approx speed of asteroid's shadow [km/s]: 14.6066 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of G181825.8-363938 by 5011 Ptah on 2024 Jun 17 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 141 0 0 -19 1 45 8 17 12.3 1 129 -3 -19 0 42 -19 2 48 -18 43 5 -19 20 27 - 19 1 41 - 19 1 49 .... 142 0 0 -19 48 1 8 17 12.1 2 128 -4 -19 46 58 -19 49 4 -19 29 20 -20 6 44 - 19 47 57 - 19 48 5 0.33 143 0 0 -20 34 10 8 17 11.6 3 128 -5 -20 33 8 -20 35 13 -20 15 29 -20 52 54 - 20 34 6 - 20 34 14 0.33 144 0 0 -21 20 11 8 17 10.9 4 128 -7 -21 19 8 -21 21 14 -21 1 29 -21 38 56 - 21 20 7 - 21 20 15 0.33 145 0 0 -22 6 1 8 17 10.1 6 127 -8 -22 4 58 -22 7 4 -21 47 18 -22 24 46 - 22 5 57 - 22 6 5 0.33 146 0 0 -22 51 38 8 17 9.0 7 127 -9 -22 50 36 -22 52 41 -22 32 55 -23 10 24 - 22 51 34 - 22 51 42 0.33 147 0 0 -23 37 2 8 17 7.7 8 127 -10 -23 35 59 -23 38 5 -23 18 19 -23 55 48 - 23 36 58 - 23 37 6 0.33 148 0 0 -24 22 9 8 17 6.3 9 126 -11 -24 21 6 -24 23 12 -24 3 26 -24 40 55 - 24 22 5 - 24 22 13 0.33 149 0 0 -25 6 59 8 17 4.7 10 126 -12 -25 5 57 -25 8 2 -24 48 17 -25 25 45 - 25 6 55 - 25 7 3 0.33 150 0 0 -25 51 30 8 17 2.9 12 125 -13 -25 50 27 -25 52 33 -25 32 48 -26 10 15 - 25 51 26 - 25 51 34 0.33 151 0 0 -26 35 40 8 17 0.9 13 125 -14 -26 34 37 -26 36 43 -26 16 59 -26 54 24 - 26 35 36 - 26 35 44 0.33 152 0 0 -27 19 28 8 16 58.8 14 124 -15 -27 18 25 -27 20 31 -27 0 48 -27 38 11 - 27 19 24 - 27 19 32 0.34 153 0 0 -28 2 52 8 16 56.5 15 124 -17 -28 1 50 -28 3 55 -27 44 13 -28 21 34 - 28 2 48 - 28 2 56 0.34 154 0 0 -28 45 51 8 16 54.0 16 123 -18 -28 44 49 -28 46 54 -28 27 14 -29 4 31 - 28 45 47 - 28 45 55 0.34 155 0 0 -29 28 24 8 16 51.4 17 123 -19 -29 27 21 -29 29 26 -29 9 48 -29 47 3 - 29 28 20 - 29 28 28 0.34 156 0 0 -30 10 29 8 16 48.7 18 122 -20 -30 9 27 -30 11 31 -29 51 55 -30 29 6 - 30 10 25 - 30 10 33 0.34 157 0 0 -30 52 5 8 16 45.8 19 122 -21 -30 51 3 -30 53 7 -30 33 33 -31 10 40 - 30 52 1 - 30 52 9 0.34 158 0 0 -31 33 12 8 16 42.8 20 121 -22 -31 32 10 -31 34 14 -31 14 42 -31 51 44 - 31 33 8 - 31 33 16 0.34 159 0 0 -32 13 47 8 16 39.7 21 121 -23 -32 12 45 -32 14 49 -31 55 19 -32 32 17 - 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33 36 35 - 33 36 43 0.35 - 40 0 0 -32 57 23 8 4 40.2 32 244 -20 -32 56 21 -32 58 24 -32 38 59 -33 15 49 - 32 57 19 - 32 57 26 0.35 - 39 0 0 -32 17 34 8 4 35.7 31 244 -19 -32 16 32 -32 18 36 -31 59 8 -32 36 3 - 32 17 30 - 32 17 38 0.35 - 38 0 0 -31 37 15 8 4 31.3 30 243 -18 -31 36 13 -31 38 17 -31 18 47 -31 55 45 - 31 37 11 - 31 37 19 0.35 - 37 0 0 -30 56 25 8 4 27.0 29 242 -17 -30 55 22 -30 57 27 -30 37 54 -31 14 57 - 30 56 21 - 30 56 28 0.35 - 36 0 0 -30 15 5 8 4 22.9 28 242 -16 -30 14 3 -30 16 7 -29 56 33 -30 33 40 - 30 15 1 - 30 15 9 0.35 - 35 0 0 -29 33 17 8 4 18.8 27 241 -15 -29 32 15 -29 34 20 -29 14 43 -29 51 54 - 29 33 13 - 29 33 21 0.35 - 34 0 0 -28 51 2 8 4 14.8 26 241 -14 -28 50 0 -28 52 5 -28 32 27 -29 9 40 - 28 50 58 - 28 51 6 0.35 - 33 0 0 -28 8 21 8 4 11.0 24 240 -13 -28 7 19 -28 9 24 -27 49 45 -28 27 1 - 28 8 17 - 28 8 25 0.35 - 32 0 0 -27 25 16 8 4 7.3 23 239 -11 -27 24 13 -27 26 18 -27 6 38 -27 43 56 - 27 25 12 - 27 25 20 0.35 - 31 0 0 -26 41 47 8 4 3.7 22 239 -10 -26 40 44 -26 42 49 -26 23 8 -27 0 28 - 26 41 43 - 26 41 51 0.35 - 30 0 0 -25 57 56 8 4 0.3 21 238 -9 -25 56 53 -25 58 58 -25 39 16 -26 16 38 - 25 57 52 - 25 58 0 0.35 - 29 0 0 -25 13 44 8 3 57.0 20 238 -8 -25 12 41 -25 14 47 -24 55 4 -25 32 27 - 25 13 40 - 25 13 48 0.35 - 28 0 0 -24 29 14 8 3 53.9 19 237 -7 -24 28 11 -24 30 16 -24 10 33 -24 47 57 - 24 29 10 - 24 29 18 0.36 - 27 0 0 -23 44 26 8 3 50.9 18 237 -6 -23 43 23 -23 45 29 -23 25 45 -24 3 9 - 23 44 22 - 23 44 30 0.36 - 26 0 0 -22 59 22 8 3 48.1 16 237 -5 -22 58 20 -23 0 25 -22 40 42 -23 18 5 - 22 59 18 - 22 59 26 0.36 - 25 0 0 -22 14 5 8 3 45.5 15 236 -4 -22 13 2 -22 15 7 -21 55 24 -22 32 47 - 22 14 1 - 22 14 8 0.36 - 24 0 0 -21 28 34 8 3 43.0 14 236 -3 -21 27 32 -21 29 37 -21 9 55 -21 47 17 - 21 28 31 - 21 28 38 0.36 - 23 0 0 -20 42 54 8 3 40.8 13 235 -1 -20 41 51 -20 43 56 -20 24 15 -21 1 35 - 20 42 50 - 20 42 58 0.36 - 22 0 0 -19 57 4 8 3 38.7 12 235 0 -19 56 2 -19 58 7 -19 38 26 -20 15 45 - 19 57 0 - 19 57 8 0.37 - 21 0 0 -19 11 8 8 3 36.8 11 235 1 -19 10 5 -19 12 10 -18 52 31 -19 29 47 - 19 11 4 - 19 11 12 0.37 - 20 0 0 -18 25 6 8 3 35.1 9 234 2 -18 24 4 -18 26 9 -18 6 31 -18 43 44 - 18 25 2 - 18 25 10 0.38 - 19 0 0 -17 39 1 8 3 33.6 8 234 3 -17 37 59 -17 40 4 -17 20 27 -17 57 38 - 17 38 57 - 17 39 5 0.38 - 18 0 0 -16 52 55 8 3 32.3 7 234 4 -16 51 53 -16 53 57 -16 34 23 -17 11 30 - 16 52 51 - 16 52 59 0.39 - 17 0 0 -16 6 49 8 3 31.2 6 233 6 -16 5 47 -16 7 51 -15 48 19 -16 25 22 - 16 6 45 - 16 6 53 0.40 - 16 0 0 -15 20 46 8 3 30.3 4 233 7 -15 19 44 -15 21 48 -15 2 18 -15 39 17 - 15 20 42 - 15 20 50 0.42 - 15 0 0 -14 34 47 8 3 29.7 3 233 8 -14 33 45 -14 35 49 -14 16 21 -14 53 15 - 14 34 43 - 14 34 51 0.46 - 14 0 0 -13 48 54 8 3 29.2 2 233 9 -13 47 52 -13 49 56 -13 30 30 -14 7 20 - 13 48 50 - 13 48 58 0.54 - 13 0 0 -13 3 9 8 3 29.0 1 232 10 -13 2 7 -13 4 10 -12 44 48 -13 21 32 - 13 3 5 - 13 3 13 0.88 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.4 Data for the target star ------------------------ * name: G181825.8-363938 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 18 25.8046 DE: -36 39 38.187 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 18 25.8046 DE: -36 39 38.187 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.700,0.500) * V mag [mag]: 13.4 * B mag [mag]: 16.6 * Diameter [mas]: 1.50 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5011) Ptah asteroid class: approx. diameter [km]: 1 approx. diameter ["]: 0.002 distance from Earth [AU]: 1.23020 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#154 date of fit: 2022 May 25 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): 0.039", 0.027", 84.5° remarks: * orbital elements for (5011)Ptah : Mean anomaly = 116.3676685500 deg Arg. of pericenter = 105.9355322539 deg Long. of node = 10.6380777567 deg Inclination = 7.4092132050 deg Eccentricity = 0.5000341471 Semimajor axis = 1.6360894400 AU Perihelion dist = 0.8179888523 AU Mag: H = 16.71, G = 0.15 Epoch of elements : MJD 60478.34051729 TDT (2024 Jun 17.3405) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1542022May25,0.19,2024,6,17,8.172413,0.021687,-0.331643,-8.226805,-0.537675,-0.000704,0.001177,0.000001,0.000000 -113.6346,-36.6512,57.67,23.40,False G181825.8-363938,18.30716795,-36.6606075,16.64,13.40,11.65,1.5,0,,18.33517589,-36.6511697,6.02,7.31,0,0,0 5011,Ptah,19.41,2.836,1.2302,0,0,-4.887,-3.83,,0.2,0 0,116.2073,2024,6,17,105.9355,10.6381,7.4092,0.50003,1.63609,0.81799,16.71,5.0,0.15 9.447,0.0393,0.0267,85,0.0267,Known errors,0.87,0,-1,-1 20240617_363938,60139.39 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 09:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org