IOTA/IOTA-ES occultation update for (2136) Jugta / HIP 113658 event on 2012 Aug 27, 09:38 UT Visible from Central America, New Zealand Summary ------- On 2012 Aug 27 UT, the 20 km diameter asteroid (2136) Jugta will occult a 7.9 mag star in the constellation Aquarius for observers along a path across Central America, New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 8.1 mag to 16.0 mag (the magnitude of the asteroid) for at most 1.5 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 16 * date and approx. time of event: 2012 Aug 27, 09:31 - 2012 Aug 27, 09:46 UT * geocentric midpoint of event [JD]: 2456166.90207083 * magnitude of target star: 7.9 * magnitude drop [mag]: 8.1 * estimated maximum duration [s]: 1.5 * Moon: 80 % sunlit, 62° distance * Sun: 171° distance * rough path description: Central America, New Zealand The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 4.18 * 1 sigma uncertainty interval [seconds]: +/- 8.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .076 +/- .050) * 1 sigma uncertainty ellipse (major, minor, PA): ( .077", .049", 78° ) * approx speed of asteroid's shadow [km/s]: 13.3080 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 113658 by 2136 Jugta on 2012 Aug 27 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Longitude Longitude Longitude Longitude Latitude Latitude Latitude Latitude - 57 0 0 24 39 41 9 31 11 8 256 0 24 45 22 24 33 59 25 32 56 23 46 17 - 58 0 0 24 23 56 9 31 13 9 255 -1 24 29 39 24 18 13 25 17 20 23 30 24 - 59 0 0 24 7 34 9 31 14 10 255 -2 24 13 18 24 1 50 25 1 7 23 13 53 - 60 0 0 23 50 36 9 31 15 11 254 -3 23 56 20 23 44 51 24 44 18 22 56 44 - 61 0 0 23 33 0 9 31 17 12 254 -4 23 38 46 23 27 14 24 26 52 22 38 59 - 62 0 0 23 14 47 9 31 19 13 254 -5 23 20 34 23 9 0 24 8 50 22 20 36 - 63 0 0 22 55 57 9 31 21 14 253 -6 23 1 45 22 50 9 23 50 10 22 1 36 - 64 0 0 22 36 30 9 31 23 15 253 -7 22 42 19 22 30 41 23 30 53 21 41 58 - 65 0 0 22 16 25 9 31 25 16 253 -8 22 22 15 22 10 34 23 10 59 21 21 42 - 66 0 0 21 55 42 9 31 27 17 252 -9 22 1 33 21 49 51 22 50 27 21 0 48 - 67 0 0 21 34 22 9 31 30 18 252 -10 21 40 14 21 28 29 22 29 18 20 39 17 - 68 0 0 21 12 24 9 31 32 19 251 -11 21 18 18 21 6 30 22 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12 128 0 0 -46 0 34 9 46 50 4 100 -10 -45 55 0 -46 6 8 -45 8 31 -46 52 44 127 0 0 -45 52 32 9 46 50 3 101 -9 -45 46 57 -45 58 7 -45 0 23 -46 44 49 126 0 0 -45 44 1 9 46 50 2 101 -9 -45 38 26 -45 49 37 -44 51 46 -46 36 25 125 0 0 -45 35 2 9 46 50 1 102 -8 -45 29 26 -45 40 38 -44 42 40 -46 27 32 124 0 0 -45 25 34 9 46 51 1 103 -7 -45 19 57 -45 31 11 -44 33 4 -46 18 12 Uncertainty in time = +/- 9 secs Prediction of 2012 Jul 3.0 Data for the target star ------------------------ * name: HIP 113658 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 01 07.8387 DE: -09 33 15.246 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .023, .023 ) * V mag [mag]: 7.9 * B mag [mag]: 8.8 * Apparent position with proper motion RA(deg): 345.4569926225 DE(deg): -9.4818571039 * Equation of equinoxes (radians) : 0.000071914130508 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2136) Jugta approx. diameter [km]: 20 approx. diameter ["]: .013 distance from Earth [AU]: 2.11300 * orbital information: orbit source: Preston date of fit: 2012 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 799 number of rejected observations: 22 time covered by the observations: 1933 Jul 24 - 2011 Jun 12 1 sigma uncertainty ellipse (major, minor, PA): 0.073, 0.043, 77° remarks: * orbital elements for (2136) Jugta : Mean anomaly = 129.93666331 deg Arg. of pericenter = 57.23031790 deg Long. of node = 149.02208699 deg Inclination = 10.58545415 deg Eccentricity = 0.04779698 Semimajor axis = 3.01822171 AU Perihelion dist = 2.87395982 AU Mag: H = 11.20, G = 0.15 Epoch of elements : MJD 56166.40200000 TDT (2012 Aug 27.402) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 27 2136 Jugta 9h 39.0m UT 7.9 23 1 7.839- 9 33 15.25HIP 113658 8.8 16.0 20 1.5 2.113 -1.703 -18.52 -135.4935 -9.549 35.61 9.85 9.6497 0.09781 -0.13364 -6.05114 -4.45029 -0.00085 -0.00004 2000 128.7333102012 821.00000 57.230318149.022087 10.5854540.04779698 3.0182217 2.873959811.6 5.00.15 RATE 1.8796520 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.077 0.049 78 5.18 0.054 0 0-3 4 056111.0020120827_113658 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 03, 01:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org