IOTA/IOTA-ES occultation update for (699) Hela / TYC 1267-00599-1 event on 2012 Dec 13, 06:16 UT Visible from SE USA, Mexico Summary ------- On 2012 Dec 13 UT, the 13 km diameter asteroid (699) Hela will occult a 9.1 mag star in the constellation Taurus for observers along a path across SE USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.7 mag to 14.8 mag (the magnitude of the asteroid) for at most 1.1 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: 24 * date and approx. time of event: 2012 Dec 13, 06:07 - 2012 Dec 13, 06:25 UT * geocentric midpoint of event [JD]: 2456274.76145833 * magnitude of target star: 9.1 * magnitude drop [mag]: 5.7 * estimated maximum duration [s]: 1.1 * Moon: 0 % sunlit, 170° distance * Sun: 168° distance * rough path description: SE USA, Mexico The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 2.83 * 1 sigma uncertainty interval [seconds]: +/- 3.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .051 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .051", .030", 95° ) * approx speed of asteroid's shadow [km/s]: 12.0915 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1267-00599-1 by 699 Hela on 2012 Dec 13 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 180 0 0 -16 22 42 6 25 4 12 69 0 -16 18 54 -16 26 31 -15 57 17 -16 48 6 -179 0 0 -15 59 3 6 25 2 13 69 -1 -15 55 13 -16 2 52 -15 33 34 -16 24 31 -178 0 0 -15 34 55 6 25 0 14 68 -3 -15 31 4 -15 38 45 -15 9 22 -16 0 26 -177 0 0 -15 10 18 6 24 58 15 68 -4 -15 6 28 -15 14 9 -14 44 42 -15 35 54 -176 0 0 -14 45 15 6 24 55 16 68 -5 -14 41 23 -14 49 6 -14 19 34 -15 10 55 -175 0 0 -14 19 44 6 24 52 17 68 -6 -14 15 52 -14 23 35 -13 53 59 -14 45 27 -174 0 0 -13 53 45 6 24 49 18 67 -7 -13 49 53 -13 57 38 -13 27 57 -14 19 33 -173 0 0 -13 27 20 6 24 46 19 67 -8 -13 23 27 -13 31 14 -13 1 28 -13 53 12 -172 0 0 -13 0 29 6 24 43 20 67 -9 -12 56 36 -13 4 23 -12 34 33 -13 26 25 -171 0 0 -12 33 12 6 24 40 21 67 -10 -12 29 18 -12 37 7 -12 7 12 -12 59 12 -170 0 0 -12 5 30 6 24 36 22 67 -11 -12 1 35 -12 9 25 -11 39 26 -12 31 33 -169 0 0 -11 37 22 6 24 32 23 66 -12 -11 33 27 -11 41 18 -11 11 14 -12 3 29 -168 0 0 -11 8 50 6 24 28 24 66 -13 -11 4 55 -11 12 46 -10 42 39 -11 35 1 -167 0 0 -10 39 55 6 24 24 25 66 -14 -10 35 58 -10 43 51 -10 13 39 -11 6 9 -166 0 0 -10 10 35 6 24 20 26 66 -15 -10 6 38 -10 14 32 - 9 44 16 -10 36 53 -165 0 0 - 9 40 53 6 24 15 27 66 -16 - 9 36 55 - 9 44 50 - 9 14 30 -10 7 14 -164 0 0 - 9 10 48 6 24 11 29 66 -17 - 9 6 50 - 9 14 46 - 8 44 22 - 9 37 13 -163 0 0 - 8 40 22 6 24 6 30 66 -19 - 8 36 23 - 8 44 21 - 8 13 52 - 9 6 51 -162 0 0 - 8 9 35 6 24 1 31 66 -20 - 8 5 36 - 8 13 34 - 7 43 2 - 8 36 7 -161 0 0 - 7 38 27 6 23 55 32 65 -21 - 7 34 27 - 7 42 27 - 7 11 51 - 8 5 2 -160 0 0 - 7 7 0 6 23 50 33 65 -22 - 7 2 59 - 7 11 0 - 6 40 20 - 7 33 38 -159 0 0 - 6 35 13 6 23 44 34 65 -23 - 6 31 13 - 6 39 14 - 6 8 31 - 7 1 55 -158 0 0 - 6 3 9 6 23 38 35 65 -24 - 5 59 8 - 6 7 9 - 5 36 23 - 6 29 53 -157 0 0 - 5 30 46 6 23 32 36 65 -25 - 5 26 45 - 5 34 48 - 5 3 58 - 5 57 34 -156 0 0 - 4 58 8 6 23 26 37 65 -26 - 4 54 6 - 5 2 9 - 4 31 16 - 5 24 58 -155 0 0 - 4 25 13 6 23 20 38 65 -27 - 4 21 11 - 4 29 15 - 3 58 19 - 4 52 5 -154 0 0 - 3 52 3 6 23 13 40 65 -28 - 3 48 0 - 3 56 6 - 3 25 6 - 4 18 58 -153 0 0 - 3 18 39 6 23 7 41 65 -30 - 3 14 36 - 3 22 42 - 2 51 40 - 3 45 36 -152 0 0 - 2 45 1 6 23 0 42 65 -31 - 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24 0 0 35 41 25 6 8 11 18 278 -29 35 45 0 35 37 50 36 5 16 35 17 35 - 23 0 0 35 33 6 6 8 9 17 278 -29 35 36 41 35 29 31 35 56 59 35 9 14 - 22 0 0 35 24 20 6 8 7 16 279 -28 35 27 56 35 20 45 35 48 15 35 0 26 - 21 0 0 35 15 7 6 8 5 15 279 -27 35 18 43 35 11 32 35 39 5 34 51 11 - 20 0 0 35 5 27 6 8 3 15 280 -26 35 9 3 35 1 51 35 29 27 34 41 28 - 19 0 0 34 55 20 6 8 1 14 281 -25 34 58 56 34 51 43 35 19 22 34 31 18 - 18 0 0 34 44 45 6 7 59 13 281 -24 34 48 22 34 41 8 35 8 50 34 20 41 - 17 0 0 34 33 42 6 7 57 12 282 -24 34 37 20 34 30 5 34 57 50 34 9 36 - 16 0 0 34 22 12 6 7 56 11 282 -23 34 25 50 34 18 34 34 46 23 33 58 3 - 15 0 0 34 10 14 6 7 54 10 283 -22 34 13 52 34 6 36 34 34 27 33 46 2 - 14 0 0 33 57 48 6 7 53 10 283 -21 34 1 26 33 54 9 34 22 4 33 33 32 - 13 0 0 33 44 53 6 7 52 9 284 -20 33 48 33 33 41 14 34 9 13 33 20 35 - 12 0 0 33 31 31 6 7 51 8 284 -19 33 35 10 33 27 51 33 55 53 33 7 9 - 11 0 0 33 17 39 6 7 50 7 285 -18 33 21 19 33 13 59 33 42 5 32 53 14 - 10 0 0 33 3 19 6 7 49 6 286 -18 33 7 0 32 59 39 33 27 49 32 38 51 - 9 0 0 32 48 31 6 7 48 5 286 -17 32 52 12 32 44 50 33 13 4 32 23 59 - 8 0 0 32 33 13 6 7 47 4 287 -16 32 36 55 32 29 31 32 57 49 32 8 38 - 7 0 0 32 17 26 6 7 47 3 287 -15 32 21 8 32 13 44 32 42 6 31 52 47 - 6 0 0 32 1 10 6 7 46 3 288 -14 32 4 53 31 57 28 32 25 54 31 36 27 - 5 0 0 31 44 25 6 7 46 2 288 -13 31 48 8 31 40 42 32 9 12 31 19 38 - 4 0 0 31 27 10 6 7 46 1 289 -12 31 30 54 31 23 26 31 52 1 31 2 19 Uncertainty in time = +/- 4 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 1267-00599-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 43 03.8760 DE: +16 17 48.861 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .021 ) * V mag [mag]: 9.1 * B mag [mag]: 9.5 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (699) Hela approx. diameter [km]: 13 approx. diameter ["]: .013 distance from Earth [AU]: 1.41000 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1074 number of rejected observations: 25 time covered by the observations: 1902 Nov 21 - 2012 Nov 23 1 sigma uncertainty ellipse (major, minor, PA): 0.045, 0.022, 96° remarks: * orbital elements for (699) Hela : Mean anomaly = 54.54599464 deg Arg. of pericenter = 91.47715167 deg Long. of node = 242.68727587 deg Inclination = 15.30287060 deg Eccentricity = 0.40721720 Semimajor axis = 2.61666677 AU Perihelion dist = 1.55111506 AU Mag: H = 11.18, G = 0.15 Epoch of elements : MJD 56274.26100000 TDT (2012 Dec 13.261) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 13 699 Hela 6h 16.5m UT 9.1 4 43 3.876 16 17 48.86TYC 1267-00599-1 9.6 14.8 13 1.1 1.410 -2.638 -19.18 -105.7005 16.302 84.45 -23.17 6.2750 -0.04466 0.08862 -6.09197 -3.07656 0.00092 0.00072 2000 53.553809201212 9.00000 91.477152242.687276 15.3028710.40721720 2.6166668 1.551115111.7 5.00.15 RATE 2.3285280 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.051 0.030 95 3.83 0.036 0 0 0 1 056264.0020121213_0599-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 23:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org