IOTA/IOTA-ES occultation update for (5443) Encrenaz / TYC 2434-00391-1 event on 2012 Dec 08, 11:22 UT Visible from Hawaii Summary ------- On 2012 Dec 08 UT, the 13 km diameter asteroid (5443) Encrenaz will occult a 10.3 mag star in the constellation Auriga for observers along a path across Hawaii. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.4 mag to 16.7 mag (the magnitude of the asteroid) for at most 1.3 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: 10 * date and approx. time of event: 2012 Dec 08, 11:12 - 2012 Dec 08, 11:32 UT * geocentric midpoint of event [JD]: 2456269.97352917 * magnitude of target star: 10.3 * magnitude drop [mag]: 6.4 * estimated maximum duration [s]: 1.3 * Moon: 31 % sunlit, 93° distance * Sun: 156° distance * rough path description: Hawaii The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 6.42 * 1 sigma uncertainty interval [seconds]: +/- 11.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .120 +/- .071) * 1 sigma uncertainty ellipse (major, minor, PA): ( .121", .069", 101° ) * approx speed of asteroid's shadow [km/s]: 9.9533 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2434-00391-1 by 5443 Encrenaz on 2012 Dec 8 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 128 0 0 -11 21 24 11 32 4 1 52 -25 -11 16 42 -11 26 6 .. .. .. -12 26 41 129 0 0 -10 36 11 11 32 3 2 52 -26 -10 31 30 -10 40 52 .. .. .. -11 41 15 130 0 0 - 9 51 14 11 32 3 4 52 -27 - 9 46 34 - 9 55 55 .. .. .. -10 56 6 131 0 0 - 9 6 37 11 32 2 5 52 -28 - 9 1 58 - 9 11 16 - 8 2 29 -10 11 15 132 0 0 - 8 22 19 11 32 0 6 51 -30 - 8 17 41 - 8 26 57 - 7 18 25 - 9 26 43 133 0 0 - 7 38 23 11 31 59 7 51 -31 - 7 33 46 - 7 43 0 - 6 34 43 - 8 42 33 134 0 0 - 6 54 50 11 31 57 9 51 -32 - 6 50 14 - 6 59 26 - 5 51 24 - 7 58 46 135 0 0 - 6 11 42 11 31 54 10 51 -33 - 6 7 7 - 6 16 17 - 5 8 30 - 7 15 22 136 0 0 - 5 28 59 11 31 52 11 51 -34 - 5 24 25 - 5 33 33 - 4 26 3 - 6 32 24 137 0 0 - 4 46 43 11 31 49 12 51 -36 - 4 42 11 - 4 51 16 - 3 44 2 - 5 49 53 138 0 0 - 4 4 56 11 31 46 13 51 -37 - 4 0 24 - 4 9 27 - 3 2 30 - 5 7 50 139 0 0 - 3 23 38 11 31 42 15 51 -38 - 3 19 7 - 3 28 8 - 2 21 28 - 4 26 15 140 0 0 - 2 42 50 11 31 39 16 51 -39 - 2 38 20 - 2 47 19 - 1 40 56 - 3 45 11 141 0 0 - 2 2 33 11 31 35 17 51 -40 - 1 58 5 - 2 7 1 - 1 0 55 - 3 4 38 142 0 0 - 1 22 49 11 31 31 18 50 -42 - 1 18 22 - 1 27 16 - 0 21 26 - 2 24 37 143 0 0 - 0 43 37 11 31 26 19 50 -43 - 0 39 11 - 0 48 3 0 17 29 - 1 45 9 144 0 0 - 0 4 59 11 31 22 20 50 -44 - 0 0 35 - 0 9 24 0 55 50 - 1 6 15 145 0 0 0 33 4 11 31 17 22 50 -45 0 37 27 0 28 40 1 33 37 - 0 27 55 146 0 0 1 10 32 11 31 12 23 50 -46 1 14 54 1 6 10 2 10 49 0 9 49 147 0 0 1 47 24 11 31 6 24 50 -47 1 51 45 1 43 3 2 47 25 0 46 58 148 0 0 2 23 40 11 31 1 25 50 -49 2 28 0 2 19 20 3 23 25 1 23 31 149 0 0 2 59 19 11 30 55 26 50 -50 3 3 38 2 55 1 3 58 48 1 59 26 150 0 0 3 34 22 11 30 49 27 50 -51 3 38 39 3 30 4 4 33 34 2 34 45 151 0 0 4 8 46 11 30 43 28 50 -52 4 13 2 4 4 30 5 7 43 3 9 25 152 0 0 4 42 33 11 30 36 29 50 -53 4 46 48 4 38 17 5 41 14 3 43 28 153 0 0 5 15 41 11 30 30 31 50 -54 5 19 55 5 11 27 6 14 6 4 16 52 154 0 0 5 48 11 11 30 23 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0 8 40 33 11 14 51 44 314 -28 8 44 39 8 36 27 9 37 14 7 43 31 -106 0 0 8 11 52 11 14 42 43 314 -26 8 16 0 8 7 45 9 8 48 7 14 36 -105 0 0 7 42 33 11 14 34 42 313 -25 7 46 42 7 38 24 8 39 43 6 45 2 -104 0 0 7 12 35 11 14 26 41 313 -24 7 16 45 7 8 25 8 9 59 6 14 49 -103 0 0 6 41 58 11 14 17 40 313 -23 6 46 9 6 37 48 7 39 37 5 43 58 -102 0 0 6 10 43 11 14 9 38 313 -22 6 14 55 6 6 31 7 8 37 5 12 27 -101 0 0 5 38 50 11 14 1 37 313 -21 5 43 3 5 34 37 6 36 59 4 40 18 -100 0 0 5 6 18 11 13 54 36 313 -20 5 10 32 5 2 4 6 4 43 4 7 31 - 99 0 0 4 33 9 11 13 46 35 313 -19 4 37 24 4 28 54 5 31 49 3 34 6 - 98 0 0 3 59 22 11 13 39 34 313 -18 4 3 38 3 55 6 4 58 17 3 0 3 - 97 0 0 3 24 58 11 13 31 33 313 -17 3 29 15 3 20 40 4 24 9 2 25 23 - 96 0 0 2 49 56 11 13 24 32 312 -16 2 54 15 2 45 38 3 49 23 1 50 5 - 95 0 0 2 14 19 11 13 17 31 312 -14 2 18 38 2 9 59 3 14 1 1 14 12 - 94 0 0 1 38 5 11 13 10 30 312 -13 1 42 26 1 33 44 2 38 4 0 37 42 - 93 0 0 1 1 16 11 13 4 29 312 -12 1 5 38 0 56 53 2 1 30 0 0 36 - 92 0 0 0 23 51 11 12 58 27 312 -11 0 28 14 0 19 28 1 24 22 - 0 37 5 - 91 0 0 - 0 14 8 11 12 51 26 312 -10 - 0 9 43 - 0 18 32 0 46 39 - 1 15 20 - 90 0 0 - 0 52 40 11 12 45 25 312 -9 - 0 48 15 - 0 57 6 0 8 22 - 1 54 9 - 89 0 0 - 1 31 46 11 12 40 24 312 -8 - 1 27 19 - 1 36 12 - 0 30 28 - 2 33 30 - 88 0 0 - 2 11 23 11 12 34 23 312 -6 - 2 6 56 - 2 15 51 - 1 9 50 - 3 13 24 - 87 0 0 - 2 51 33 11 12 29 22 312 -5 - 2 47 4 - 2 56 2 - 1 49 43 - 3 53 49 - 86 0 0 - 3 32 12 11 12 24 20 311 -4 - 3 27 42 - 3 36 43 - 2 30 7 - 4 34 45 - 85 0 0 - 4 13 22 11 12 19 19 311 -3 - 4 8 51 - 4 17 53 - 3 11 1 - 5 16 10 - 84 0 0 - 4 55 0 11 12 15 18 311 -2 - 4 50 27 - 4 59 32 - 3 52 24 - 5 58 3 - 83 0 0 - 5 37 5 11 12 11 17 311 -1 - 5 32 32 - 5 41 38 - 4 34 15 - 6 40 24 Uncertainty in time = +/- 14 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 2434-00391-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 33 30.4512 DE: +36 42 06.682 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .020 ) * V mag [mag]: 10.3 * B mag [mag]: 11.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5443) Encrenaz approx. diameter [km]: 13 approx. diameter ["]: .011 distance from Earth [AU]: 1.57800 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 772 number of rejected observations: 6 time covered by the observations: 1980 Sep 13 - 2012 Jan 20 1 sigma uncertainty ellipse (major, minor, PA): 0.120, 0.066, 101° remarks: * orbital elements for (5443) Encrenaz : Mean anomaly = 268.30440565 deg Arg. of pericenter = 232.08284009 deg Long. of node = 320.34574038 deg Inclination = 10.72978551 deg Eccentricity = 0.10807639 Semimajor axis = 2.47295605 AU Perihelion dist = 2.20568789 AU Mag: H = 13.10, G = 0.15 Epoch of elements : MJD 56269.47400000 TDT (2012 Dec 08.474) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 8 5443 Encrenaz 11h 21.9m UT 10.3 6 33 30.451 36 42 6.68TYC 2434-00391-1 11.8 16.7 13 1.3 1.578 -2.602 1.32 -149.7151 36.701 7.55 -22.78 11.3647 -0.01307 -0.29948 -5.61285 0.23889 -0.00213 -0.00115 2000 265.90329220121129.00000232.082840320.345740 10.7297860.10807639 2.4729561 2.205687913.1 5.00.15 RATE 2.5344250 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.121 0.069 101 7.42 0.073 0 0 2 2 056264.0020121208_0391-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 10, 04:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org