IOTA/IOTA-ES occultation update for (21586) Pourkaviani / UCAC4 343-097690 event on 2024 Jul 07, 10:49 UT Visible from Summary ------- On 2024 Jul 07 UT, the 17.4997914823487 km diameter asteroid (21586) Pourkaviani will occult a 10.9 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.73 mag to 16.64 mag (the magnitude of the asteroid) for at most 2.510 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 Jul 07, 10:35 - 2024 Jul 07, 11:03 * geocentric midpoint of event [JD]: 2460498.95104796 * magnitude of target star: 10.92 * magnitude drop [mag]: 5.73 * estimated maximum duration [s]: 2.510 * Moon: 3 % sunlit, 137° distance * Sun: 156° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 0.30 * 1 sigma uncertainty interval [seconds]: +/- 5.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.033, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.033", 0.002", 95°) * approx speed of asteroid's shadow [km/s]: 7.5199 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 343-097690 by 21586 Pourkaviani on 2024 Jul 7 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 82 0 0 4 14 53 11 3 32.0 1 112 23 4 20 27 4 9 19 4 23 48 4 5 58 .... 83 0 0 3 51 8 11 3 31.6 2 112 22 3 56 41 3 45 34 4 0 3 3 42 13 -0.05 84 0 0 3 27 29 11 3 30.9 3 112 21 3 33 2 3 21 55 3 36 23 3 18 34 -0.08 85 0 0 3 3 56 11 3 29.9 4 112 20 3 9 29 2 58 23 3 12 51 2 55 2 -0.10 86 0 0 2 40 31 11 3 28.6 5 112 19 2 46 4 2 34 58 2 49 25 2 31 37 -0.11 87 0 0 2 17 13 11 3 26.9 6 112 18 2 22 46 2 11 41 2 26 7 2 8 20 -0.11 88 0 0 1 54 4 11 3 25.1 7 112 17 1 59 36 1 48 31 2 2 57 1 45 11 -0.12 89 0 0 1 31 3 11 3 22.9 8 112 16 1 36 35 1 25 31 1 39 55 1 22 10 -0.12 90 0 0 1 8 11 11 3 20.4 10 112 15 1 13 43 1 2 39 1 17 3 0 59 19 -0.13 91 0 0 0 45 29 11 3 17.6 11 112 14 0 51 0 0 39 57 0 54 20 0 36 37 -0.13 92 0 0 0 22 56 11 3 14.6 12 112 13 0 28 27 0 17 25 0 31 47 0 14 6 -0.13 93 0 0 0 0 35 11 3 11.3 13 112 11 0 6 5 - 0 4 56 0 9 25 - 0 8 16 -0.13 94 0 0 - 0 21 36 11 3 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Uncertainty in time = +/- 5 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 343-097690 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 22 40.6353 DE: -21 32 08.931 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 22 40.6353 DE: -21 32 08.931 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.500,0.300) * V mag [mag]: 10.9 * B mag [mag]: 13.3 * Diameter [mas]: 1.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (21586) Pourkaviani asteroid class: approx. diameter [km]: 17 approx. diameter ["]: 0.014 distance from Earth [AU]: 1.70370 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): 0.033", 0.002", 95.044° remarks: * orbital elements for (21586)Pourkaviani : Mean anomaly = 1.2927573177 deg Arg. of pericenter = 143.1144026422 deg Long. of node = 125.4554026212 deg Inclination = 1.8045595237 deg Eccentricity = 0.1394731328 Semimajor axis = 3.0953734316 AU Perihelion dist = 2.6636520019 AU Mag: H = 12.75, G = 0.15 Epoch of elements : MJD 60498.45104867 TDT (2024 Jul 07.4510) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512023Apr25,2.51,2024,7,7,10.825151,-0.004845,0.124420,-4.241270,-0.164242,0.002260,-0.000286,0.000001,0.000000 172.7657,-21.5600,18.89,22.50,False UCAC4 343-097690,17.37795427,-21.5358141,13.30,10.92,9.63,1.1,4,,17.40275262,-21.5600320,5.73,6.56,0,0,0 21586,Pourkaviani,16.64,18.859,1.7037,0,0,-1.568,-0.85,,1.6,0 0,1.2111,2024,7,7,143.1144,125.4554,1.8046,0.13947,3.09537,2.66365,12.75,5.0,0.15 1.302,0.0333,0.0019,95,0.0046,Known errors,0.88,0,-1,-1 20240707_097690,60140.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org