IOTA/IOTA-ES occultation update for (784) Pickeringia / TYC 7392-02055-1 event on 2008 Feb 01, 04:27 UT Visible from Africa Summary ------- On 2008 Feb 01 UT, the 89 km diameter asteroid (784) Pickeringia will occult a 11.4 mag star in the constellation Sagittarius for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.8 mag to 14.1 mag (the magnitude of the asteroid) for at most 2.0 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: 87 * date and approx. time of event: 2008 Feb 01, 04:25 - 2008 Feb 01, 04:30 UT * midpoint of event [JD]: 2454497.68595417 * magnitude of target star: 11.4 * magnitude drop [mag]: 2.8 * estimated maximum duration [s]: 2.0 * Moon: 32 % sunlit, 29° distance * Sun: 40° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 95 * 1 sigma uncertainty interval [path widths]: +/- 0.57 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .032 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .032", .023", 90° ) * approx speed of asteroid's shadow [km/s]: 44.4963 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7392-02055-1 by 784 Pickeringia on 2008 Feb 01 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 - 1 0 0 20 25 7 4 25 32 0 124 -32 19 54 11 .. .. .. .. .. .. .. .. .. 0 0 0 19 46 33 4 25 32 1 125 -31 19 15 38 20 17 35 .. .. .. 20 53 7 1 0 0 19 7 56 4 25 32 2 125 -29 18 37 3 19 38 56 18 1 58 20 14 26 2 0 0 18 29 17 4 25 32 4 125 -28 17 58 25 19 0 15 17 23 23 19 35 43 3 0 0 17 50 37 4 25 32 5 126 -27 17 19 47 18 21 33 16 44 47 18 56 58 4 0 0 17 11 57 4 25 32 6 126 -26 16 41 10 17 42 51 16 6 13 18 18 14 5 0 0 16 33 20 4 25 33 7 126 -25 16 2 35 17 4 11 15 27 40 17 39 31 6 0 0 15 54 46 4 25 33 8 126 -24 15 24 4 16 25 34 14 49 12 17 0 51 7 0 0 15 16 16 4 25 34 9 127 -23 14 45 37 15 47 2 14 10 49 16 22 15 8 0 0 14 37 53 4 25 34 11 127 -22 14 7 17 15 8 36 13 32 33 15 43 45 9 0 0 13 59 37 4 25 35 12 127 -21 13 29 5 14 30 16 12 54 24 15 5 22 10 0 0 13 21 30 4 25 35 13 128 -20 12 51 2 13 52 6 12 16 25 14 27 7 11 0 0 12 43 33 4 25 36 14 128 -19 12 13 8 13 14 5 11 38 36 13 49 1 12 0 0 12 5 47 4 25 37 15 128 -18 11 35 27 12 36 15 11 0 59 13 11 7 13 0 0 11 28 14 4 25 38 16 128 -17 10 57 58 11 58 37 10 23 35 12 33 25 14 0 0 10 50 55 4 25 39 17 129 -15 10 20 43 11 21 14 9 46 24 11 55 56 15 0 0 10 13 50 4 25 40 19 129 -14 9 43 43 10 44 5 9 9 30 11 18 42 16 0 0 9 37 2 4 25 41 20 129 -13 9 6 59 10 7 12 8 32 51 10 41 43 17 0 0 9 0 31 4 25 42 21 129 -12 8 30 33 9 30 36 7 56 31 10 5 2 18 0 0 8 24 19 4 25 43 22 129 -11 7 54 26 8 54 19 7 20 29 9 28 39 19 0 0 7 48 26 4 25 44 23 130 -10 7 18 38 8 18 21 6 44 47 8 52 35 20 0 0 7 12 54 4 25 45 24 130 -9 6 43 11 7 42 44 6 9 26 8 16 52 21 0 0 6 37 44 4 25 46 25 130 -8 6 8 6 7 7 28 5 34 27 7 41 30 22 0 0 6 2 56 4 25 48 27 130 -6 5 33 23 6 32 35 4 59 50 7 6 30 23 0 0 5 28 32 4 25 49 28 130 -5 4 59 5 5 58 5 4 25 38 6 31 54 24 0 0 4 54 32 4 25 51 29 131 -4 4 25 10 5 23 59 3 51 49 5 57 42 25 0 0 4 20 57 4 25 52 30 131 -3 3 51 41 4 50 19 3 18 27 5 23 55 26 0 0 3 47 49 4 25 54 31 131 -2 3 18 39 4 17 5 2 45 30 4 50 35 27 0 0 3 15 7 4 25 55 32 131 -1 2 46 3 3 44 18 2 13 1 4 17 41 28 0 0 2 42 54 4 25 57 33 132 0 2 13 55 3 11 58 1 41 0 3 45 15 29 0 0 2 11 8 4 25 59 34 132 1 1 42 15 2 40 7 1 9 27 3 13 17 30 0 0 1 39 52 4 26 0 36 132 2 1 11 5 2 8 45 0 38 23 2 41 48 31 0 0 1 9 5 4 26 2 37 132 4 0 40 24 1 37 52 0 7 48 2 10 49 32 0 0 0 38 49 4 26 4 38 132 5 0 10 13 1 7 30 - 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Data for the target star ------------------------ * name: TYC 7392-02055-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 10 05.8495 DE: -31 50 08.775 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .021 ) * V mag [mag]: 11.4 * B mag [mag]: 11.9 * Apparent position with proper motion RA(deg): 272.6538467981 DE(deg): -31.8353702943 * Equation of equinoxes (radians) : 0.000044316905322 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (784) Pickeringia approx. diameter [km]: 89 approx. diameter ["]: .041 distance from Earth [AU]: 3.01600 * orbital information: orbit source: Preston date of fit: 2007 Dec 19 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 798 number of rejected observations: 65 time covered by the observations: 1921 Sep 30 - 2007 Aug 07 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.009, 90° remarks: * orbital elements for (784) Pickeringia : Mean anomaly = 1.78477473 deg Arg. of pericenter = 238.97706563 deg Long. of node = 15.01779344 deg Inclination = 12.28242843 deg Eccentricity = 0.24179039 Semimajor axis = 3.09865905 AU Perihelion dist = 2.34943305 AU Mag: H = 9.24, G = 0.15 Epoch of elements : MJD 54497.18600000 TDT (2008 Feb 01.186) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Feb 01 784 Pickeringia 4h 27.8m UT 11.4 18 10 5.849-31 50 8.77TYC 7392-02055-1 11.9 14.1 89 2.0 3.016 5.731 -5.51 74.813 -31.834 116.43 -17.28 4.4629 .02649 .33910 25.04366 -1.89079 -0.00362 -0.00072 2000 0.486308942008 125.00000238.977066 15.017793 12.2824280.241790393.098659052.34943305 9.05 0.15 RATE 1.8069386 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.032 0.023 90.0 1.570 0.023 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Dec 22, 20:13 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org