IOTA/IOTA-ES occultation update for (5011) Ptah / UCAC4 297-129903 event on 2024 Oct 04, 13:39 UT Visible from Summary ------- On 2024 Oct 04 UT, the 1.575 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 8.64 mag to 21.72 mag (the magnitude of the asteroid) for at most 0.080 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 Oct 04, 13:34 - 2024 Oct 04, 13:44 * geocentric midpoint of event [JD]: 2460588.06888208 * magnitude of target star: 13.08 * magnitude drop [mag]: 8.64 * estimated maximum duration [s]: 0.080 * Moon: 3 % sunlit, 58° distance * Sun: 77° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 2 * 1 sigma uncertainty interval [path widths]: +/- 15.39 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.013) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.013", 93°) * approx speed of asteroid's shadow [km/s]: 20.3517 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 297-129903 by 5011 Ptah on 2024 Oct 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 - 53 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. -22 38 19 .. .. .. .... - 52 0 0 -22 58 40 13 34 12.9 1 123 59 -22 59 12 -22 58 8 -23 15 4 -22 42 18 .... - 51 0 0 -23 35 13 13 34 13.1 2 123 60 -23 35 45 -23 34 41 -23 51 37 -23 18 51 0.33 - 50 0 0 -24 11 33 13 34 13.4 3 122 60 -24 12 5 -24 11 1 -24 27 56 -23 55 11 0.33 - 49 0 0 -24 47 38 13 34 13.8 4 122 60 -24 48 10 -24 47 6 -25 4 1 -24 31 18 0.33 - 48 0 0 -25 23 28 13 34 14.3 5 121 61 -25 24 0 -25 22 56 -25 39 50 -25 7 8 0.33 - 47 0 0 -25 59 1 13 34 15.0 6 121 61 -25 59 34 -25 58 29 -26 15 22 -25 42 42 0.33 - 46 0 0 -26 34 17 13 34 15.7 8 121 61 -26 34 49 -26 33 45 -26 50 37 -26 17 59 0.33 - 45 0 0 -27 9 14 13 34 16.6 9 120 61 -27 9 46 -27 8 42 -27 25 32 -26 52 58 0.33 - 44 0 0 -27 43 52 13 34 17.6 10 120 62 -27 44 24 -27 43 20 -28 0 9 -27 27 37 0.33 - 43 0 0 -28 18 9 13 34 18.6 11 119 62 -28 18 41 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46 - 9 19 21 - 8 47 15 0.47 142 0 0 - 8 26 55 13 44 10.2 1 239 -74 - 8 27 27 - 8 26 24 - 8 42 57 - 8 10 55 0.59 143 0 0 - 7 50 50 13 44 10.3 0 239 -75 - 7 51 21 - 7 50 18 - 8 6 49 - 7 34 52 1.78 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 297-129903 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 52 08.8638 DE: -30 37 21.749 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 52 08.8638 DE: -30 37 21.749 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 13.1 * B mag [mag]: 14.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5011) Ptah asteroid class: approx. diameter [km]: 2 approx. diameter ["]: 0.001 distance from Earth [AU]: 2.46990 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): 0.017", 0.013", 93.251° remarks: * orbital elements for (5011)Ptah : Mean anomaly = 167.8079750893 deg Arg. of pericenter = 105.9402075606 deg Long. of node = 10.6335392302 deg Inclination = 7.4092181805 deg Eccentricity = 0.5000836860 Semimajor axis = 1.6360481034 AU Perihelion dist = 0.8178871374 AU Mag: H = 16.71, G = 0.15 Epoch of elements : MJD 60587.56888196 TDT (2024 Oct 04.5689) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1542022May25,0.08,2024,10,4,13.653170,0.044772,-0.297870,11.357439,1.720768,0.005486,-0.000222,0.000000,0.000000 49.8986,-30.6303,-27.66,-4.68,False UCAC4 297-129903,17.86912887,-30.6227080,14.05,13.08,12.56,0.0,0,,17.89554415,-30.6302898,8.64,8.72,0,0,0 5011,Ptah,21.72,1.575,2.4699,0,0,3.133,6.13,,0.2,0 0,167.5400,2024,10,4,105.9402,10.6335,7.4092,0.50008,1.63605,0.81789,16.71,5.0,0.15 15.720,0.0173,0.0133,93,0.0135,Known errors,0.77,0,-1,-1 20241004_129903,60140.61 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org