IOTA/IOTA-ES occultation update for (5011) Ptah / UCAC4 303-243546 event on 2024 Mar 15, 15:34 UT Visible from Summary ------- On 2024 Mar 15 UT, the 1.521 km diameter asteroid (5011) Ptah will occult a 13.2 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 7.33 mag to 20.53 mag (the magnitude of the asteroid) for at most 0.090 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: 5 * date and approx. time of event: 2024 Mar 15, 15:28 - 2024 Mar 15, 15:39 * geocentric midpoint of event [JD]: 2460385.14861484 * magnitude of target star: 13.20 * magnitude drop [mag]: 7.33 * estimated maximum duration [s]: 0.090 * Moon: 34 % sunlit, 149° distance * Sun: 77° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 2 * 1 sigma uncertainty interval [path widths]: +/- 13.39 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.016) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.016", 94°) * approx speed of asteroid's shadow [km/s]: 17.3315 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 303-243546 by 5011 Ptah on 2024 Mar 15 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 138 0 0 -12 1 51 15 28 17.7 1 120 -74 -12 2 22 -12 1 20 -12 16 5 -11 47 39 .... 139 0 0 -12 36 30 15 28 17.9 2 120 -73 -12 37 1 -12 35 59 -12 50 46 -12 22 16 0.38 140 0 0 -13 11 24 15 28 18.3 3 119 -72 -13 11 55 -13 10 53 -13 25 42 -12 57 8 0.39 141 0 0 -13 46 33 15 28 18.8 4 119 -71 -13 47 4 -13 46 2 -14 0 53 -13 32 15 0.40 142 0 0 -14 21 56 15 28 19.5 5 119 -70 -14 22 27 -14 21 24 -14 36 18 -14 7 36 0.40 143 0 0 -14 57 31 15 28 20.3 7 119 -69 -14 58 2 -14 56 59 -15 11 54 -14 43 8 0.40 144 0 0 -15 33 17 15 28 21.3 8 118 -68 -15 33 48 -15 32 45 -15 47 42 -15 18 53 0.40 145 0 0 -16 9 13 15 28 22.4 9 118 -67 -16 9 44 -16 8 41 -16 23 40 -15 54 47 0.40 146 0 0 -16 45 18 15 28 23.7 10 118 -66 -16 45 49 -16 44 46 -16 59 47 -16 30 51 0.40 147 0 0 -17 21 31 15 28 25.1 11 118 -65 -17 22 2 -17 20 59 -17 36 1 -17 7 2 0.40 148 0 0 -17 57 50 15 28 26.7 12 117 -64 -17 58 22 -17 57 18 -18 12 22 -17 43 20 0.40 149 0 0 -18 34 15 15 28 28.4 13 117 -62 -18 34 46 -18 33 43 -18 48 48 -18 19 43 0.40 150 0 0 -19 10 43 15 28 30.3 14 117 -61 -19 11 15 -19 10 12 -19 25 18 -18 56 10 0.40 151 0 0 -19 47 15 15 28 32.3 16 116 -60 -19 47 47 -19 46 43 -20 1 51 -19 32 41 0.40 152 0 0 -20 23 48 15 28 34.5 17 116 -59 -20 24 20 -20 23 16 -20 38 25 -20 9 13 0.40 153 0 0 -21 0 21 15 28 36.8 18 115 -58 -21 0 53 -20 59 49 -21 14 59 -20 45 45 0.40 154 0 0 -21 36 53 15 28 39.2 19 115 -57 -21 37 25 -21 36 22 -21 51 32 -21 22 17 0.40 155 0 0 -22 13 24 15 28 41.8 20 115 -56 -22 13 55 -22 12 52 -22 28 3 -21 58 46 0.40 156 0 0 -22 49 50 15 28 44.5 21 114 -55 -22 50 22 -22 49 18 -23 4 30 -22 35 12 0.40 157 0 0 -23 26 12 15 28 47.3 22 114 -54 -23 26 44 -23 25 40 -23 40 52 -23 11 33 0.40 158 0 0 -24 2 27 15 28 50.3 23 113 -53 -24 2 59 -24 1 55 -24 17 8 -23 47 48 0.40 159 0 0 -24 38 36 15 28 53.4 24 113 -51 -24 39 7 -24 38 4 -24 53 16 -24 23 56 0.40 160 0 0 -25 14 35 15 28 56.6 25 112 -50 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58 24 -30 13 30 -29 44 23 0.46 - 30 0 0 -29 25 13 15 39 39.6 7 240 55 -29 25 45 -29 24 41 -29 39 48 -29 10 39 0.46 - 29 0 0 -28 51 13 15 39 40.4 6 240 55 -28 51 45 -28 50 42 -29 5 49 -28 36 39 0.47 - 28 0 0 -28 16 58 15 39 41.1 5 239 55 -28 17 30 -28 16 26 -28 31 35 -28 2 23 0.49 - 27 0 0 -27 42 28 15 39 41.7 4 239 54 -27 43 0 -27 41 56 -27 57 5 -27 27 53 0.51 - 26 0 0 -27 7 44 15 39 42.1 3 238 54 -27 8 16 -27 7 13 -27 22 22 -26 53 9 0.55 - 25 0 0 -26 32 48 15 39 42.4 2 238 54 -26 33 20 -26 32 16 -26 47 26 -26 18 12 0.65 - 24 0 0 -25 57 40 15 39 42.6 1 237 53 -25 58 12 -25 57 8 -26 12 18 -25 43 4 1.07 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 14.2 Data for the target star ------------------------ * name: UCAC4 303-243546 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 37 03.7874 DE: -29 26 32.144 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 37 03.7875 DE: -29 26 32.144 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 13.2 * 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 ["]: 0.001 distance from Earth [AU]: 1.71810 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): 0.020", 0.016", 94.4° remarks: * orbital elements for (5011)Ptah : Mean anomaly = 72.2445677037 deg Arg. of pericenter = 105.9337241307 deg Long. of node = 10.6413895231 deg Inclination = 7.4093724495 deg Eccentricity = 0.4999949041 Semimajor axis = 1.6361111567 AU Perihelion dist = 0.8180639158 AU Mag: H = 16.71, G = 0.15 Epoch of elements : MJD 60384.64861479 TDT (2024 Mar 15.6486) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1542022May25,0.09,2024,3,15,15.566756,-0.051590,-0.361460,9.683367,-1.388466,-0.004906,-0.000451,0.000000,0.000000 -127.5820,-29.4222,-51.32,-1.77,False UCAC4 303-243546,18.61771868,-29.4422623,13.48,13.20,13.05,0.0,0,,18.64320191,-29.4222163,7.33,7.03,0,0,1 5011,Ptah,20.53,1.521,1.7181,0,0,3.794,-7.10,,0.2,0 0,71.9391,2024,3,15,105.9337,10.6414,7.4094,0.49999,1.63611,0.81806,16.71,5.0,0.15 14.271,0.0197,0.0163,94,0.0163,Known errors,1.17,0,-1,-1 20240315_243546,60139.24 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 05:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org