IOTA/IOTA-ES occultation update for (546) Herodias / TYC 7956-01085-1 event on 2012 Jul 21, 08:10 UT Visible from Brazil, Argentina, Chile, New Zealand Summary ------- On 2012 Jul 21 UT, the 64 km diameter asteroid (546) Herodias will occult a 11.2 mag star in the constellation Sagittarius for observers along a path across Brazil, Argentina, Chile, New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 14.0 mag (the magnitude of the asteroid) for at most 5.0 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 63 * date and approx. time of event: 2012 Jul 21, 08:01 - 2012 Jul 21, 08:18 UT * geocentric midpoint of event [JD]: 2456129.84024167 * magnitude of target star: 11.2 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 5.0 * Moon: 6 % sunlit, 140° distance * Sun: 157° distance * rough path description: Brazil, Argentina, Chile, New Zealand The occultation path -------------------- * approximate projected width [km]: 64 * 1 sigma uncertainty interval [path widths]: +/- 0.96 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .054 +/- .044) * 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .044", 87° ) * approx speed of asteroid's shadow [km/s]: 12.8053 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7956-01085-1 by 546 Herodias on 2012 Jul 21 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 143 0 0 -14 8 6 8 18 11 4 133 -1 -13 44 8 -14 32 5 -12 58 10 -15 18 9 144 0 0 -15 3 21 8 18 10 6 133 -2 -14 39 27 -15 27 15 -13 53 36 -16 13 13 145 0 0 -15 58 2 8 18 9 7 133 -4 -15 34 12 -16 21 52 -14 48 29 -17 7 42 146 0 0 -16 52 7 8 18 8 8 132 -5 -16 28 22 -17 15 53 -15 42 48 -18 1 34 147 0 0 -17 45 35 8 18 6 10 132 -6 -17 21 54 -18 9 16 -16 36 30 -18 54 48 148 0 0 -18 38 23 8 18 4 11 132 -7 -18 14 48 -19 1 59 -17 29 33 -19 47 21 149 0 0 -19 30 30 8 18 2 12 131 -8 -19 7 0 -19 54 1 -18 21 55 -20 39 13 150 0 0 -20 21 54 8 17 59 13 131 -9 -19 58 30 -20 45 20 -19 13 36 -21 30 21 151 0 0 -21 12 35 8 17 56 15 131 -11 -20 49 16 -21 35 54 -20 4 33 -22 20 44 152 0 0 -22 2 29 8 17 54 16 130 -12 -21 39 17 -22 25 43 -20 54 45 -23 10 21 153 0 0 -22 51 37 8 17 51 17 130 -13 -22 28 31 -23 14 45 -21 44 11 -23 59 11 154 0 0 -23 39 58 8 17 47 18 130 -14 -23 16 58 -24 2 59 -22 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0 0 0 30 45 8 1 42 4 227 -3 0 54 40 0 6 48 1 40 34 - 0 39 12 - 31 0 0 1 27 40 8 1 42 3 227 -2 1 51 33 1 3 46 2 37 21 0 17 50 - 30 0 0 2 24 19 8 1 41 2 227 0 2 48 9 2 0 28 3 33 52 1 14 38 Uncertainty in time = +/- 6 secs Prediction of 2012 Jul 8.0 Data for the target star ------------------------ * name: TYC 7956-01085-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 16 21.2129 DE: -42 54 01.092 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .048, .041 ) * V mag [mag]: 11.2 * B mag [mag]: 11.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (546) Herodias approx. diameter [km]: 64 approx. diameter ["]: .046 distance from Earth [AU]: 1.92300 * orbital information: orbit source: Preston date of fit: 2012 Jul 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 857 number of rejected observations: 50 time covered by the observations: 1904 Oct 13 - 2012 Jun 22 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.016, 77° remarks: * orbital elements for (546) Herodias : Mean anomaly = 162.78887846 deg Arg. of pericenter = 109.00868140 deg Long. of node = 21.84653384 deg Inclination = 14.85111390 deg Eccentricity = 0.11576466 Semimajor axis = 2.59760070 AU Perihelion dist = 2.29689035 AU Mag: H = 9.69, G = 0.15 Epoch of elements : MJD 56129.34000000 TDT (2012 Jul 21.340) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Jul 21 546 Herodias 8h 9.9m UT 11.2 20 16 21.213-42 54 1.09TYC 7956-01085-1 11.7 14.0 64 5.0 1.923 -2.963 -5.70 -117.8984 -42.899 59.13 20.36 8.1658 0.01570 -0.08955 -7.11870 -1.25029 -0.00028 0.00215 2000 160.5900442012 712.00000109.008681 21.846534 14.8511140.11576466 2.5976007 2.2968903 9.7 5.00.15 RATE 2.3542120 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.054 0.044 87 1.96 0.044 0 0-1-2 056116.0020120721_1085-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 07, 22:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org