IOTA/IOTA-ES occultation update for (15809) 1994 JS / UCAC2 19469627 event on 2008 May 18, 21:31 UT Visible from SE Asia, Africa Summary ------- On 2008 May 18 UT, the 121 km diameter asteroid (15809) 1994 JS will occult a 13.2 mag star in the constellation Ophiuchus for observers along a path across SE Asia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 10.0 mag to 23.2 mag (the magnitude of the asteroid) for at most 5.7 seconds. This update is based on historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 0 * date and approx. time of event: 2008 May 18, 21:27 - 2008 May 18, 21:36 UT * midpoint of event [JD]: 2454605.397025 * magnitude of target star: 13.2 * magnitude drop [mag]: 10.0 * estimated maximum duration [s]: 5.7 * Moon: 99 % sunlit, 37° distance * Sun: 155° distance * rough path description: SE Asia, Africa The occultation path -------------------- * approximate projected width [km]: 133 * 1 sigma uncertainty interval [path widths]: +/- 319.64 * 1 sigma uncertainty interval [seconds]: +/- 4293.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 4.461 +/- 1.381) * 1 sigma uncertainty ellipse (major, minor, PA): ( 4.618", .716", 105° ) * approx speed of asteroid's shadow [km/s]: 21.3212 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 19469627 by 15809 1994 JS on 2008 May 18 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 - 18 0 0 17 42 52 21 36 15 1 121 -26 18 25 21 17 0 41 .. .. .. .. .. .. - 17 0 0 17 8 10 21 36 15 2 122 -27 17 50 32 16 26 4 .. .. .. .. .. .. - 16 0 0 16 33 40 21 36 15 3 122 -28 17 15 56 15 51 40 .. .. .. .. .. .. - 15 0 0 15 59 23 21 36 15 4 122 -29 16 41 33 15 17 29 .. .. .. .. .. .. - 14 0 0 15 25 20 21 36 14 5 123 -30 16 7 23 14 43 33 .. .. .. .. .. .. - 13 0 0 14 51 33 21 36 13 6 123 -31 15 33 29 14 9 52 .. .. .. .. .. .. - 12 0 0 14 18 2 21 36 13 7 123 -33 14 59 51 13 36 28 .. .. .. .. .. .. - 11 0 0 13 44 48 21 36 12 8 123 -34 14 26 31 13 3 21 .. .. .. .. .. .. - 10 0 0 13 11 52 21 36 11 10 124 -35 13 53 28 12 30 32 .. .. .. .. .. .. - 9 0 0 12 39 16 21 36 10 11 124 -36 13 20 44 11 58 3 .. .. .. .. .. .. - 8 0 0 12 6 59 21 36 9 12 124 -37 12 48 20 11 25 53 .. .. .. -13 25 36 - 7 0 0 11 35 3 21 36 7 13 124 -38 12 16 17 10 54 5 .. .. .. -13 53 37 - 6 0 0 11 3 29 21 36 6 14 125 -39 11 44 35 10 22 38 .. .. .. -14 21 15 - 5 0 0 10 32 17 21 36 4 15 125 -40 11 13 16 9 51 34 .. .. .. -14 48 27 - 4 0 0 10 1 28 21 36 2 16 125 -41 10 42 19 9 20 52 .. .. .. -15 15 15 - 3 0 0 9 31 3 21 36 1 17 125 -42 10 11 46 8 50 35 .. .. .. -15 41 38 - 2 0 0 9 1 3 21 35 59 18 125 -44 9 41 38 8 20 42 .. .. .. -16 7 35 - 1 0 0 8 31 27 21 35 57 19 126 -45 9 11 55 7 51 14 .. .. .. -16 33 6 0 0 0 8 2 17 21 35 55 20 126 -46 8 42 37 7 22 12 .. .. .. -16 58 11 1 0 0 7 33 34 21 35 52 22 126 -47 8 13 46 6 53 36 41 15 35 -17 22 49 2 0 0 7 5 17 21 35 50 23 126 -48 7 45 22 6 25 27 40 36 22 -17 47 1 3 0 0 6 37 28 21 35 48 24 126 -49 7 17 25 5 57 45 39 57 44 -18 10 46 4 0 0 6 10 6 21 35 45 25 127 -50 6 49 56 5 30 31 39 19 41 -18 34 4 5 0 0 5 43 13 21 35 42 26 127 -51 6 22 55 5 3 45 38 42 15 -18 56 55 6 0 0 5 16 49 21 35 40 27 127 -52 5 56 23 4 37 28 38 5 26 -19 19 18 7 0 0 4 50 54 21 35 37 28 127 -53 5 30 20 4 11 41 37 29 15 -19 41 14 8 0 0 4 25 28 21 35 34 29 127 -54 5 4 47 3 46 22 36 53 43 -20 2 42 9 0 0 4 0 32 21 35 31 30 128 -55 4 39 44 3 21 33 36 18 52 -20 23 42 10 0 0 3 36 6 21 35 28 31 128 -56 4 15 11 2 57 15 35 44 41 -20 44 15 11 0 0 3 12 11 21 35 25 32 128 -57 3 51 8 2 33 27 35 11 11 -21 4 19 12 0 0 2 48 46 21 35 21 33 128 -58 3 27 36 2 10 9 34 38 24 -21 23 56 13 0 0 2 25 53 21 35 18 34 129 -59 3 4 36 1 47 23 34 6 19 -21 43 4 14 0 0 2 3 31 21 35 15 35 129 -60 2 42 7 1 25 7 33 34 57 -22 1 45 15 0 0 1 41 40 21 35 11 36 129 -61 2 20 9 1 3 23 33 4 18 -22 19 57 16 0 0 1 20 21 21 35 7 37 130 -62 1 58 44 0 42 11 32 34 24 -22 37 41 17 0 0 0 59 34 21 35 4 38 130 -63 1 37 50 0 21 30 32 5 13 -22 54 57 18 0 0 0 39 19 21 35 0 39 130 -63 1 17 29 0 1 21 31 36 48 -23 11 45 19 0 0 0 19 36 21 34 56 40 130 -64 0 57 39 - 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9 56 20 125 0 0 16 34 3 21 27 22 15 232 3 17 16 15 15 52 7 .. .. .. - 9 25 31 126 0 0 17 8 22 21 27 20 14 233 5 17 50 41 16 26 20 .. .. .. - 8 54 24 127 0 0 17 42 53 21 27 19 12 233 6 18 25 18 17 0 46 .. .. .. - 8 22 58 128 0 0 18 17 35 21 27 17 11 233 7 19 0 6 17 35 22 .. .. .. - 7 51 14 129 0 0 18 52 27 21 27 16 10 234 8 19 35 3 18 10 9 .. .. .. - 7 19 14 130 0 0 19 27 28 21 27 15 9 234 9 20 10 9 18 45 4 .. .. .. .. .. .. 131 0 0 20 2 37 21 27 14 8 234 10 20 45 22 19 20 8 .. .. .. .. .. .. 132 0 0 20 37 51 21 27 13 7 235 11 21 20 42 19 55 18 .. .. .. .. .. .. 133 0 0 21 13 12 21 27 13 6 235 12 21 56 7 20 30 34 .. .. .. .. .. .. 134 0 0 21 48 36 21 27 12 5 236 13 22 31 35 21 5 54 .. .. .. .. .. .. 135 0 0 22 24 3 21 27 12 4 236 14 23 7 6 21 41 18 .. .. .. .. .. .. 136 0 0 22 59 32 21 27 11 3 236 15 23 42 39 22 16 43 .. .. .. .. .. .. 137 0 0 23 35 2 21 27 11 1 237 16 24 18 12 22 52 10 .. .. .. .. .. .. 138 0 0 24 10 31 21 27 11 0 237 17 .. .. .. 23 27 36 .. .. .. .. .. .. Data for the target star ------------------------ * name: UCAC2 19469627 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 26 46.5893 DE: -29 35 33.556 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .044, .044 ) * V mag [mag]: 13.2 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 261.8362167908 DE(deg): -29.6014457919 * Equation of equinoxes (radians) : 0.000039518160484 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (15809) 1994 JS approx. diameter [km]: 121 approx. diameter ["]: .005 distance from Earth [AU]: 33.00700 * orbital information: orbit source: Preston date of fit: 2007 Apr 02 source of used astrometry: MPC (via Astdys) number of used observations: 52 number of rejected observations: 0 time covered by the observations: 1994 May 11 - 2001 Jun 12 1 sigma uncertainty ellipse (major, minor, PA): 4.618, 0.715, 105° remarks: * orbital elements for (15809) 1994 JS : Mean anomaly = 340.81649344 deg Arg. of pericenter = 236.83235380 deg Long. of node = 56.29778488 deg Inclination = 14.02792148 deg Eccentricity = 0.22258578 Semimajor axis = 42.54277738 AU Perihelion dist = 33.07336002 AU Mag: H = 7.64, G = 0.15 Epoch of elements : MJD 54604.89700000 TDT (2008 May 18.897) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 18 15809 1994 JS 21h 31.7m UT 13.2 17 26 46.589-29 35 33.56UCAC2 19469627 0.0 23.2 121 5.7 33.007 -0.245 -0.21 61.833 -29.593 -143.81 19.78 21.5286 -.02610 .41276-12.00921 -0.77661 -0.00239 0.00073 2000 340.7990992008 514.00000236.832354 56.297785 14.0279210.2225857842.542777333.07336007.8 5 0.15 RATE .0355190 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 4.618 0.716 105.020.640 1.616 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 13, 03:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org