IOTA/IOTA-ES occultation update for (4580) Child / TYC 5170-01801-1 event on 2007 Aug 02, 15:00 UT Visible from Australia Summary ------- On 2007 Aug 02 UT, the 14 km diameter asteroid (4580) Child will occult a 10.2 mag star in the constellation Aquila for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.5 mag to 15.7 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: 9 * date and approx. time of event: 2007 Aug 02, 14:52 - 2007 Aug 02, 15:08 UT * magnitude of target star: 10.2 * magnitude drop [mag]: 5.5 * estimated maximum duration [s]: 1.1 * Moon: 85 % sunlit, 51° distance * Sun: 164° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 7.22 * 1 sigma uncertainty interval [seconds]: +/- 10.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .105 +/- .072) * 1 sigma uncertainty ellipse (major, minor, PA): ( .105", .071", 86° ) * approx speed of asteroid's shadow [km/s]: 12.5636 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5170-01801-1 by 4580 Child on 2007 Aug 02 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 32 0 0 -47 6 53 15 8 21 0 96 -5 -47 2 55 -47 10 51 .. .. .. -48 8 14 33 0 0 -47 11 10 15 8 21 1 95 -5 -47 7 12 -47 15 7 .. .. .. -48 12 27 34 0 0 -47 15 3 15 8 21 2 95 -6 -47 11 6 -47 19 0 .. .. .. -48 16 17 35 0 0 -47 18 33 15 8 21 2 94 -7 -47 14 36 -47 22 30 .. .. .. -48 19 44 36 0 0 -47 21 40 15 8 21 3 93 -7 -47 17 43 -47 25 37 .. .. .. -48 22 49 37 0 0 -47 24 24 15 8 20 4 92 -8 -47 20 27 -47 28 21 .. .. .. -48 25 31 38 0 0 -47 26 45 15 8 20 4 92 -9 -47 22 48 -47 30 42 -46 25 59 -48 27 50 39 0 0 -47 28 43 15 8 19 5 91 -9 -47 24 46 -47 32 40 -46 27 58 -48 29 47 40 0 0 -47 30 18 15 8 19 6 90 -10 -47 26 22 -47 34 15 -46 29 34 -48 31 21 41 0 0 -47 31 31 15 8 18 6 90 -11 -47 27 34 -47 35 27 -46 30 48 -48 32 32 42 0 0 -47 32 20 15 8 17 7 89 -11 -47 28 24 -47 36 17 -46 31 38 -48 33 22 43 0 0 -47 32 47 15 8 16 8 88 -12 -47 28 51 -47 36 44 -46 32 5 -48 33 48 44 0 0 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9 36 6 9 27 51 10 35 30 8 28 6 -165 0 0 9 49 52 14 52 54 24 261 -28 9 53 59 9 45 45 10 53 14 8 46 8 -164 0 0 10 7 14 14 52 50 23 261 -27 10 11 20 10 3 7 11 10 28 9 3 39 -163 0 0 10 24 5 14 52 47 22 261 -26 10 28 10 10 19 59 11 27 10 9 20 38 -162 0 0 10 40 24 14 52 43 21 261 -25 10 44 29 10 36 18 11 43 21 9 37 6 -161 0 0 10 56 11 14 52 40 20 261 -24 11 0 16 10 52 7 11 59 1 9 53 1 -160 0 0 11 11 27 14 52 37 19 261 -23 11 15 31 11 7 23 12 14 9 10 8 25 -159 0 0 11 26 11 14 52 34 18 262 -22 11 30 15 11 22 7 12 28 46 10 23 17 -158 0 0 11 40 24 14 52 31 17 262 -21 11 44 27 11 36 20 12 42 50 10 37 36 -157 0 0 11 54 4 14 52 29 16 262 -20 11 58 7 11 50 1 12 56 24 10 51 24 -156 0 0 12 7 12 14 52 26 15 262 -19 12 11 14 12 3 10 13 9 25 11 4 39 -155 0 0 12 19 48 14 52 24 14 262 -18 12 23 50 12 15 46 13 21 55 11 17 22 -154 0 0 12 31 52 14 52 22 13 262 -17 12 35 54 12 27 51 13 33 53 11 29 32 -153 0 0 12 43 24 14 52 20 12 263 -16 12 47 26 12 39 23 13 45 19 11 41 10 -152 0 0 12 54 24 14 52 18 11 263 -15 12 58 25 12 50 23 13 56 12 11 52 16 -151 0 0 13 4 52 14 52 16 10 263 -14 13 8 52 13 0 51 14 6 34 12 2 49 -150 0 0 13 14 47 14 52 15 9 263 -13 13 18 47 13 10 47 14 16 24 12 12 50 -149 0 0 13 24 10 14 52 13 8 264 -12 13 28 9 13 20 10 14 25 42 12 22 17 -148 0 0 13 33 0 14 52 12 7 264 -11 13 36 59 13 29 1 14 34 28 12 31 13 -147 0 0 13 41 18 14 52 11 6 264 -10 13 45 17 13 37 19 14 42 42 12 39 35 -146 0 0 13 49 4 14 52 10 5 264 -9 13 53 3 13 45 5 14 50 23 12 47 25 -145 0 0 13 56 17 14 52 10 4 264 -8 14 0 15 13 52 18 .. .. .. 12 54 42 -144 0 0 14 2 57 14 52 9 3 265 -7 14 6 56 13 58 59 .. .. .. 13 1 26 -143 0 0 14 9 5 14 52 9 2 265 -6 14 13 4 14 5 7 .. .. .. 13 7 37 -142 0 0 14 14 41 14 52 8 1 265 -5 14 18 39 14 10 43 .. .. .. 13 13 16 -141 0 0 14 19 44 14 52 8 0 265 -4 14 23 42 14 15 46 .. .. .. 13 18 21 Data for the target star ------------------------ * name: TYC 5170-01801-1 * constellation : Aquila * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 16 37.0645 DE: -04 23 51.835 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .022 ) * V mag [mag]: 10.2 * B mag [mag]: 11.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4580) Child approx. diameter [km]: 14 approx. diameter ["]: .011 distance from Earth [AU]: 1.76500 * orbital information: orbit source: Preston date of fit: 2007 Jul 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 612 number of rejected observations: 17 time covered by the observations: 1952 Sep 15 - 2007 Jun 19 1 sigma uncertainty ellipse (major, minor, PA): 0.103, 0.068, 86° remarks: * orbital elements for (4580) Child : Mean anomaly = 110.05431081 deg Arg. of pericenter = 15.78945994 deg Long. of node = 169.67818897 deg Inclination = 13.88897433 deg Eccentricity = 0.10442069 Semimajor axis = 2.63746858 AU Perihelion dist = 2.36206229 AU Mag: H = 12.03, G = 0.15 Epoch of elements : MJD 54314.62500000 TDT (2007 Aug 02.625) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 02 4580 Child 15h 0.3m UT 10.2 20 16 37.064- 4 23 51.84TYC 5170-01801-1 11.3 15.7 14 1.1 1.765 -2.032 -18.03 128.264 -4.393 -43.49 17.75 15.0042 .14382 -.24235 -6.09899 -3.61778 0.00072 -0.00129 2000 108.9900822007 729.00000 15.789460169.678189 13.8889740.104420692.637468582.3620622911.85 0.15 RATE 2.3010350 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.105 0.071 86.2 8.220 0.079 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 29, 02:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org