IOTA/IOTA-ES occultation update for (13355) 1998 TP17 / TYC 6390-00719-1 event on 2008 Aug 20, 08:28 UT Visible from Caribbean, Central America, New Zealand Summary ------- On 2008 Aug 20 UT, the 16 km diameter asteroid (13355) 1998 TP17 will occult a 10.3 mag star in the constellation Aquarius for observers along a path across Caribbean, Central America, New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.3 mag to 15.6 mag (the magnitude of the asteroid) for at most 1.4 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: 9 * date and approx. time of event: 2008 Aug 20, 08:19 - 2008 Aug 20, 08:37 UT * magnitude of target star: 10.3 * magnitude drop [mag]: 5.3 * estimated maximum duration [s]: 1.4 * Moon: 87 % sunlit, 34° distance * Sun: 166° distance * rough path description: Caribbean, Central America, New Zealand The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 7.31 * 1 sigma uncertainty interval [seconds]: +/- 14.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .137 +/- .077) * 1 sigma uncertainty ellipse (major, minor, PA): ( .140", .072", 76° ) * approx speed of asteroid's shadow [km/s]: 11.5563 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6390-00719-1 by 13355 1998 TP17 on 2008 Aug 20 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 - 43 0 0 35 19 17 8 19 32 7 242 0 35 24 10 35 14 24 36 35 36 34 3 1 - 44 0 0 34 53 14 8 19 33 8 242 -1 34 58 8 34 48 19 36 9 56 33 36 35 - 45 0 0 34 26 26 8 19 34 9 241 -2 34 31 22 34 21 30 35 43 31 33 9 23 - 46 0 0 33 58 53 8 19 35 10 241 -3 34 3 51 33 53 55 35 16 22 32 41 26 - 47 0 0 33 30 35 8 19 37 11 240 -4 33 35 34 33 25 36 34 48 29 32 12 44 - 48 0 0 33 1 31 8 19 39 12 239 -5 33 6 32 32 56 31 34 19 50 31 43 16 - 49 0 0 32 31 42 8 19 41 13 239 -6 32 36 44 32 26 40 33 50 25 31 13 2 - 50 0 0 32 1 6 8 19 43 14 238 -7 32 6 10 31 56 2 33 20 14 30 42 1 - 51 0 0 31 29 44 8 19 45 15 238 -8 31 34 50 31 24 39 32 49 18 30 10 14 - 52 0 0 30 57 36 8 19 48 16 237 -9 31 2 43 30 52 28 32 17 34 29 37 40 - 53 0 0 30 24 40 8 19 50 17 237 -10 30 29 49 30 19 31 31 45 4 29 4 20 - 54 0 0 29 50 58 8 19 53 18 236 -11 29 56 8 29 45 47 31 11 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33 -42 13 47 156 0 0 -40 54 28 8 37 37 12 103 -19 -40 50 2 -40 58 54 -39 45 9 -42 3 45 155 0 0 -40 43 41 8 37 39 11 104 -18 -40 39 14 -40 48 8 -39 34 10 -41 53 9 154 0 0 -40 32 18 8 37 40 11 104 -17 -40 27 50 -40 36 46 -39 22 35 -41 41 58 153 0 0 -40 20 20 8 37 42 10 105 -17 -40 15 51 -40 24 48 -39 10 24 -41 30 13 152 0 0 -40 7 46 8 37 43 9 106 -16 -40 3 16 -40 12 15 -38 57 37 -41 17 52 151 0 0 -39 54 35 8 37 44 8 106 -15 -39 50 5 -39 59 6 -38 44 13 -41 4 56 150 0 0 -39 40 48 8 37 45 8 107 -14 -39 36 17 -39 45 19 -38 30 11 -40 51 23 149 0 0 -39 26 24 8 37 46 7 108 -14 -39 21 52 -39 30 56 -38 15 32 -40 37 14 148 0 0 -39 11 22 8 37 47 6 108 -13 -39 6 49 -39 15 55 -38 0 14 -40 22 27 147 0 0 -38 55 42 8 37 48 5 109 -12 -38 51 8 -39 0 16 -37 44 18 -40 7 3 146 0 0 -38 39 23 8 37 48 4 110 -11 -38 34 48 -38 43 58 -37 27 42 -39 51 1 145 0 0 -38 22 25 8 37 49 3 110 -10 -38 17 48 -38 27 1 -37 10 26 -39 34 20 144 0 0 -38 4 47 8 37 49 3 111 -10 -38 0 9 -38 9 25 -36 52 30 -39 17 1 143 0 0 -37 46 29 8 37 50 2 111 -9 -37 41 50 -37 51 8 -36 33 54 -38 59 1 142 0 0 -37 27 30 8 37 50 1 112 -8 -37 22 50 -37 32 10 -36 14 35 -38 40 21 141 0 0 -37 7 49 8 37 50 0 113 -7 -37 3 8 -37 12 31 .. .. .. -38 21 1 Uncertainty in time = +/- 16 secs [Prediction of 2008 Aug 6.0] Data for the target star ------------------------ * name: TYC 6390-00719-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 53 38.5841 DE: -17 59 36.265 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .023 ) * V mag [mag]: 10.3 * B mag [mag]: 11.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (13355) 1998 TP17 approx. diameter [km]: 16 approx. diameter ["]: .012 distance from Earth [AU]: 1.84800 * orbital information: orbit source: Preston date of fit: 2008 Aug 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 534 number of rejected observations: 5 time covered by the observations: 1987 Sep 18 - 2008 Jul 28 1 sigma uncertainty ellipse (major, minor, PA): 0.138, 0.068, 76° remarks: * orbital elements for (13355) 1998 TP17 : Mean anomaly = 28.75097967 deg Arg. of pericenter = 183.52809414 deg Long. of node = 117.64995522 deg Inclination = 10.93443188 deg Eccentricity = 0.07844271 Semimajor axis = 3.04360287 AU Perihelion dist = 2.80485441 AU Mag: H = 11.69, G = 0.15 Epoch of elements : MJD 54698.35300000 TDT (2008 Aug 20.353) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Aug 20 13355 1998 TP17 8h 28.6m UT 10.3 22 53 38.584-17 59 36.27TYC 6390-00719-1 11.5 15.6 16 1.4 1.848 -1.672 -19.88 -112.8009 -17.988 53.67 12.27 8.4774 -0.00724 0.00894 -5.00981 -4.17698 -0.00131 0.00049 2000 27.2005062008 812.00000183.528094117.649955 10.9344320.07844271 3.0436029 2.804854411.6 5.00.15 RATE 1.8561880 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.140 0.072 76 8.31 0.087 0 54684.5020080820_0719-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Aug 06, 04:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org