IOTA/IOTA-ES occultation update for (58) Concordia / TYC 6328-01625-1 event on 2012 Aug 25, 20:25 UT Visible from Indian Ocean Summary ------- On 2012 Aug 25 UT, the 105 km diameter asteroid (58) Concordia will occult a 10.2 mag star in the constellation Capricornus for observers along a path across Indian Ocean. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 13.0 mag (the magnitude of the asteroid) for at most 12.6 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 97 * date and approx. time of event: 2012 Aug 25, 20:15 - 2012 Aug 25, 20:35 UT * geocentric midpoint of event [JD]: 2456165.3511125 * magnitude of target star: 10.2 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 12.6 * Moon: 64 % sunlit, 45° distance * Sun: 151° distance * rough path description: Indian Ocean The occultation path -------------------- * approximate projected width [km]: 129 * 1 sigma uncertainty interval [path widths]: +/- 0.39 * 1 sigma uncertainty interval [seconds]: +/- 5.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .028", 87° ) * approx speed of asteroid's shadow [km/s]: 8.3059 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6328-01625-1 by 58 Concordia on 2012 Aug 25 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 ' " Latitude Latitude Latitude Latitude - 63 0 0 -66 31 3 20 35 19 16 92 0 -65 55 22 -67 7 0 -65 27 43 -67 35 14 - 62 0 0 -66 36 57 20 35 18 17 91 0 -66 1 22 -67 12 49 -65 33 47 -67 40 59 - 61 0 0 -66 42 34 20 35 16 17 90 -1 -66 7 4 -67 18 21 -65 39 33 -67 46 27 - 60 0 0 -66 47 54 20 35 14 18 89 -1 -66 12 28 -67 23 35 -65 45 1 -67 51 37 - 59 0 0 -66 52 56 20 35 12 18 88 -2 -66 17 35 -67 28 33 -65 50 12 -67 56 31 - 58 0 0 -66 57 41 20 35 9 18 87 -2 -66 22 25 -67 33 14 -65 55 5 -68 1 9 - 57 0 0 -67 2 10 20 35 7 19 86 -2 -66 26 58 -67 37 38 -65 59 41 -68 5 30 - 56 0 0 -67 6 22 20 35 5 19 85 -3 -66 31 13 -67 41 46 -66 3 59 -68 9 35 - 55 0 0 -67 10 17 20 35 3 20 85 -3 -66 35 12 -67 45 38 -66 8 1 -68 13 23 - 54 0 0 -67 13 56 20 35 1 20 84 -4 -66 38 55 -67 49 14 -66 11 46 -68 16 56 - 53 0 0 -67 17 19 20 34 59 20 83 -4 -66 42 21 -67 52 33 -66 15 14 -68 20 14 - 52 0 0 -67 20 26 20 34 57 21 82 -4 -66 45 30 -67 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20 15 31 12 256 -40 -10 36 42 -11 51 33 -10 7 51 -12 21 4 109 0 0 -10 49 59 20 15 28 11 256 -39 -10 12 51 -11 27 25 - 9 44 5 -11 56 51 110 0 0 -10 26 36 20 15 25 10 255 -38 - 9 49 36 -11 3 55 - 9 20 56 -11 33 14 111 0 0 -10 3 50 20 15 22 9 255 -37 - 9 26 58 -10 41 1 - 8 58 23 -11 10 14 112 0 0 - 9 41 42 20 15 20 7 255 -36 - 9 4 56 -10 18 45 - 8 36 27 -10 47 52 113 0 0 - 9 20 11 20 15 18 6 255 -35 - 8 43 32 - 9 57 6 - 8 15 9 -10 26 7 114 0 0 - 8 59 17 20 15 16 5 255 -34 - 8 22 46 - 9 36 6 - 7 54 28 -10 5 1 115 0 0 - 8 39 2 20 15 14 4 255 -33 - 8 2 37 - 9 15 44 - 7 34 24 - 9 44 34 116 0 0 - 8 19 25 20 15 13 3 254 -31 - 7 43 7 - 8 56 0 - 7 14 59 - 9 24 45 117 0 0 - 8 0 27 20 15 12 2 254 -30 - 7 24 15 - 8 36 56 - 6 56 12 - 9 5 35 118 0 0 - 7 42 8 20 15 12 1 254 -29 - 7 6 2 - 8 18 30 - 6 38 4 - 8 47 5 119 0 0 - 7 24 28 20 15 12 0 254 -28 - 6 48 28 - 8 0 44 .. .. .. - 8 29 14 Uncertainty in time = +/- 6 secs Prediction of 2012 Jul 8.0 Data for the target star ------------------------ * name: TYC 6328-01625-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 20 55.4572 DE: -15 55 14.401 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .033, .025 ) * V mag [mag]: 10.2 * B mag [mag]: 10.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (58) Concordia approx. diameter [km]: 105 approx. diameter ["]: .079 distance from Earth [AU]: 1.83100 * orbital information: orbit source: Preston date of fit: 2012 Jul 07 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1149 number of rejected observations: 137 time covered by the observations: 1900 Mar 28 - 2012 Jun 23 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.014, 80° remarks: * orbital elements for (58) Concordia : Mean anomaly = 116.63289887 deg Arg. of pericenter = 31.67860025 deg Long. of node = 161.17637285 deg Inclination = 5.06057495 deg Eccentricity = 0.04465706 Semimajor axis = 2.69942669 AU Perihelion dist = 2.57887822 AU Mag: H = 8.91, G = 0.15 Epoch of elements : MJD 56164.85100000 TDT (2012 Aug 25.851) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 25 58 Concordia 20h 25.6m UT 10.2 20 20 55.457-15 55 14.40TYC 6328-01625-1 10.7 13.0 105 12.6 1.831 -1.377 -10.55 24.3287 -15.918 -125.93 10.39 20.4267 0.27283 -0.51327 -4.14101 -2.19771 0.00275 0.00034 2000 115.5548762012 821.00000 31.678600161.176373 5.0605750.04465706 2.6994267 2.5788782 8.9 5.00.15 RATE 2.2222700 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.040 0.028 87 1.39 0.031 0 0 2-1 056116.0020120825_1625-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 07, 23:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org