IOTA/IOTA-ES occultation update for (21586) Pourkaviani / UCAC4 335-139938 event on 2024 Oct 13, 22:51 UT Visible from Summary ------- On 2024 Oct 13 UT, the 17.5637005955747 km diameter asteroid (21586) Pourkaviani will occult a 11.4 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 6.83 mag to 18.18 mag (the magnitude of the asteroid) for at most 0.650 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 Oct 13, 22:47 - 2024 Oct 13, 22:55 * geocentric midpoint of event [JD]: 2460597.45223950 * magnitude of target star: 11.35 * magnitude drop [mag]: 6.83 * estimated maximum duration [s]: 0.650 * Moon: 82 % sunlit, 58° distance * Sun: 73° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.001", 90°) * approx speed of asteroid's shadow [km/s]: 27.8187 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 335-139938 by 21586 Pourkaviani on 2024 Oct 13 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 176 0 0 - 8 50 22 22 47 27.3 1 113 72 - 8 55 45 - 8 44 59 - 8 57 0 - 8 43 44 .... 177 0 0 - 9 16 7 22 47 27.4 2 113 73 - 9 21 30 - 9 10 44 - 9 22 46 - 9 9 29 0.20 178 0 0 - 9 41 52 22 47 27.6 3 113 73 - 9 47 16 - 9 36 29 - 9 48 31 - 9 35 14 0.19 179 0 0 -10 7 36 22 47 27.8 4 113 74 -10 13 0 -10 2 13 -10 14 15 -10 0 58 0.18 -180 0 0 -10 33 19 22 47 28.1 5 113 75 -10 38 42 -10 27 55 -10 39 57 -10 26 40 0.18 -179 0 0 -10 58 59 22 47 28.6 6 112 76 -11 4 22 -10 53 36 -11 5 37 -10 52 20 0.18 -178 0 0 -11 24 36 22 47 29.1 7 112 77 -11 29 59 -11 19 13 -11 31 15 -11 17 58 0.18 -177 0 0 -11 50 10 22 47 29.6 8 112 78 -11 55 33 -11 44 47 -11 56 48 -11 43 31 0.17 -176 0 0 -12 15 39 22 47 30.3 9 112 79 -12 21 2 -12 10 16 -12 22 18 -12 9 1 0.17 -175 0 0 -12 41 4 22 47 31.0 10 112 80 -12 46 27 -12 35 41 -12 47 42 -12 34 26 0.17 -174 0 0 -13 6 23 22 47 31.8 11 111 80 -13 11 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22 54 58.5 6 248 -64 -11 1 7 -10 50 21 -11 2 23 -10 49 5 0.21 - 4 0 0 -10 30 3 22 54 58.9 5 247 -65 -10 35 27 -10 24 40 -10 36 42 -10 23 25 0.21 - 3 0 0 -10 4 21 22 54 59.3 4 247 -66 -10 9 44 - 9 58 57 -10 10 59 - 9 57 42 0.23 - 2 0 0 - 9 38 36 22 54 59.6 3 247 -67 - 9 43 59 - 9 33 13 - 9 45 15 - 9 31 58 0.25 - 1 0 0 - 9 12 51 22 54 59.8 2 247 -68 - 9 18 14 - 9 7 28 - 9 19 30 - 9 6 13 0.29 0 0 0 - 8 47 5 22 54 59.9 1 247 -69 - 8 52 29 - 8 41 42 - 8 53 44 - 8 40 27 0.45 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 335-139938 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 14 12.1863 DE: -23 03 14.601 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 14 12.1862 DE: -23 03 14.601 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.4 * B mag [mag]: 12.9 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (21586) Pourkaviani asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.009 distance from Earth [AU]: 2.82170 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#51 date of fit: 2023 Apr 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): 0.019", 0.001", 90.362° remarks: * orbital elements for (21586)Pourkaviani : Mean anomaly = 19.1366692485 deg Arg. of pericenter = 143.0961084175 deg Long. of node = 125.4545103651 deg Inclination = 1.8046229203 deg Eccentricity = 0.1394084212 Semimajor axis = 3.0951162938 AU Perihelion dist = 2.6636310178 AU Mag: H = 12.75, G = 0.15 Epoch of elements : MJD 60596.95223942 TDT (2024 Oct 13.9522) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512023Apr25,0.65,2024,10,13,22.853748,-0.000204,-0.159917,15.701649,0.020984,0.005449,0.000160,-0.000001,0.000000 -91.8677,-23.0477,-166.30,-8.23,False UCAC4 335-139938,18.23671844,-23.0540558,12.92,11.35,10.50,0.2,0,,18.26161736,-23.0477415,6.83,7.23,0,0,0 21586,Pourkaviani,18.18,17.973,2.8217,0,0,3.546,0.07,,1.6,0 0,18.9643,2024,10,13,143.0961,125.4545,1.8046,0.13941,3.09512,2.66363,12.75,5.0,0.15 1.116,0.0187,0.0010,90,0.0010,Known errors,0.71,0,-1,-1 20241013_139938,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org