IOTA/IOTA-ES occultation update for (5011) Ptah / UCAC4 269-112225 event on 2024 Jul 04, 17:03 UT Visible from Summary ------- On 2024 Jul 04 UT, the 1.519 km diameter asteroid (5011) Ptah will occult a 13.1 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 6.56 mag to 19.67 mag (the magnitude of the asteroid) for at most 0.110 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: 4 * date and approx. time of event: 2024 Jul 04, 16:56 - 2024 Jul 04, 17:10 * geocentric midpoint of event [JD]: 2460496.21069154 * magnitude of target star: 13.11 * magnitude drop [mag]: 6.56 * estimated maximum duration [s]: 0.110 * Moon: 2 % sunlit, 172° distance * Sun: 160° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 2 * 1 sigma uncertainty interval [path widths]: +/- 16.09 * 1 sigma uncertainty interval [seconds]: +/- 2.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.038, +/- 0.026) * 1 sigma uncertainty ellipse (major, minor, PA): (0.038", 0.026", 91°) * approx speed of asteroid's shadow [km/s]: 13.3445 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 269-112225 by 5011 Ptah on 2024 Jul 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 - 15 0 0 -15 25 14 17 10 28.3 0 128 19 -15 24 39 -15 25 49 -15 6 3 -15 44 30 .... - 14 0 0 -16 11 1 17 10 28.1 2 128 18 -16 10 26 -16 11 36 -15 51 45 -16 30 21 0.44 - 13 0 0 -16 57 9 17 10 27.7 3 127 16 -16 56 34 -16 57 45 -16 37 48 -17 16 35 0.46 - 12 0 0 -17 43 38 17 10 27.0 4 127 15 -17 43 2 -17 44 13 -17 24 11 -18 3 8 0.47 - 11 0 0 -18 30 24 17 10 26.0 5 127 14 -18 29 48 -18 30 59 -18 10 52 -18 49 59 0.48 - 10 0 0 -19 17 26 17 10 24.8 7 126 13 -19 16 50 -19 18 2 -18 57 50 -19 37 6 0.48 - 9 0 0 -20 4 42 17 10 23.3 8 126 12 -20 4 6 -20 5 18 -19 45 2 -20 24 27 0.48 - 8 0 0 -20 52 11 17 10 21.7 9 126 10 -20 51 35 -20 52 47 -20 32 26 -21 12 0 0.48 - 7 0 0 -21 39 49 17 10 19.8 10 125 9 -21 39 13 -21 40 26 -21 20 0 -21 59 43 0.49 - 6 0 0 -22 27 36 17 10 17.6 11 125 8 -22 27 0 -22 28 12 -22 7 43 -22 47 34 0.49 - 5 0 0 -23 15 29 17 10 15.2 13 124 7 -23 14 52 -23 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-37 25 6 -37 3 58 -37 45 5 0.53 -168 0 0 -36 40 6 16 56 32.1 12 234 -17 -36 39 29 -36 40 44 -36 19 34 -37 0 43 0.54 -167 0 0 -35 55 13 16 56 30.0 11 233 -16 -35 54 36 -35 55 51 -35 34 41 -36 15 51 0.54 -166 0 0 -35 9 52 16 56 28.0 10 232 -15 -35 9 14 -35 10 29 -34 49 19 -35 30 30 0.54 -165 0 0 -34 24 3 16 56 26.3 9 232 -14 -34 23 25 -34 24 40 -34 3 29 -34 44 41 0.55 -164 0 0 -33 37 48 16 56 24.7 8 231 -13 -33 37 10 -33 38 26 -33 17 15 -33 58 26 0.56 -163 0 0 -32 51 10 16 56 23.3 7 231 -12 -32 50 32 -32 51 47 -32 30 37 -33 11 47 0.57 -162 0 0 -32 4 9 16 56 22.1 6 230 -11 -32 3 32 -32 4 47 -31 43 38 -32 24 46 0.58 -161 0 0 -31 16 49 16 56 21.1 4 230 -10 -31 16 11 -31 17 26 -30 56 18 -31 37 25 0.61 -160 0 0 -30 29 11 16 56 20.4 3 229 -9 -30 28 33 -30 29 48 -30 8 41 -30 49 45 0.65 -159 0 0 -29 41 16 16 56 19.8 2 229 -8 -29 40 39 -29 41 53 -29 20 48 -30 1 49 0.73 -158 0 0 -28 53 8 16 56 19.5 1 228 -7 -28 52 30 -28 53 45 -28 32 42 -29 13 39 1.03 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 269-112225 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 45 59.5909 DE: -36 23 37.063 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 45 59.5909 DE: -36 23 37.063 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 13.1 * B mag [mag]: 13.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5011) Ptah asteroid class: approx. diameter [km]: 2 approx. diameter ["]: 0.002 distance from Earth [AU]: 1.30100 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): 0.038", 0.026", 91.386° remarks: * orbital elements for (5011)Ptah : Mean anomaly = 124.5476552297 deg Arg. of pericenter = 105.9363656268 deg Long. of node = 10.6372767547 deg Inclination = 7.4091980680 deg Eccentricity = 0.5000414519 Semimajor axis = 1.6360857847 AU Perihelion dist = 0.8179750735 AU Mag: H = 16.71, G = 0.15 Epoch of elements : MJD 60495.71069167 TDT (2024 Jul 04.7107) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1542022May25,0.11,2024,7,4,17.056597,-0.067543,-0.453607,-7.449903,1.109064,0.001468,0.001122,0.000001,0.000000 87.8723,-36.4042,-74.70,22.78,False UCAC4 269-112225,17.76655303,-36.3936287,13.45,13.11,12.93,0.0,0,,17.79456124,-36.4042211,6.57,6.30,0,0,0 5011,Ptah,19.67,1.519,1.3010,0,0,-4.169,7.50,,0.2,0 0,124.2129,2024,7,4,105.9364,10.6373,7.4092,0.50004,1.63609,0.81798,16.71,5.0,0.15 16.963,0.0383,0.0257,91,0.0259,Known errors,0.77,0,-1,-1 20240704_112225,60140.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org