IOTA/IOTA-ES occultation update for (162) Laurentia / 2UCAC 18996809 event on 2008 Jul 03, 17:43 UT Visible from Australia, S Africa Summary ------- On 2008 Jul 03 UT, the 99 km diameter asteroid (162) Laurentia will occult a 12.6 mag star in the constellation Sagittarius for observers along a path across Australia, S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.3 mag to 13.5 mag (the magnitude of the asteroid) for at most 7.4 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: 71 * date and approx. time of event: 2008 Jul 03, 17:36 - 2008 Jul 03, 17:51 UT * midpoint of event [JD]: 2454651.238825 * magnitude of target star: 12.6 * magnitude drop [mag]: 1.3 * estimated maximum duration [s]: 7.4 * Moon: 1 % sunlit, 161° distance * Sun: 168° distance * rough path description: Australia, S Africa The occultation path -------------------- * approximate projected width [km]: 101 * 1 sigma uncertainty interval [path widths]: +/- 0.82 * 1 sigma uncertainty interval [seconds]: +/- 5.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .052 +/- .049) * 1 sigma uncertainty ellipse (major, minor, PA): ( .052", .049", 90° ) * approx speed of asteroid's shadow [km/s]: 13.3078 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 18996809 by 162 Laurentia on 2008 Jul 3 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 - 4 0 0 -17 31 50 17 51 36 11 119 0 -16 59 56 -18 3 47 -16 7 45 -18 56 21 - 3 0 0 -18 6 41 17 51 34 12 119 -1 -17 34 49 -18 38 37 -16 42 42 -19 31 7 - 2 0 0 -18 41 17 17 51 32 13 119 -3 -18 9 27 -19 13 10 -17 17 23 -20 5 37 - 1 0 0 -19 15 37 17 51 30 14 118 -4 -18 43 49 -19 47 28 -17 51 49 -20 39 50 0 0 0 -19 49 39 17 51 27 15 118 -5 -19 17 54 -20 21 27 -18 25 58 -21 13 46 1 0 0 -20 23 23 17 51 25 16 118 -6 -19 51 42 -20 55 9 -18 59 50 -21 47 23 2 0 0 -20 56 49 17 51 22 17 117 -7 -20 25 10 -21 28 32 -19 33 23 -22 20 41 3 0 0 -21 29 55 17 51 19 18 117 -8 -20 58 19 -22 1 35 -20 6 37 -22 53 39 4 0 0 -22 2 41 17 51 16 19 116 -9 -21 31 8 -22 34 17 -20 39 32 -23 26 16 5 0 0 -22 35 6 17 51 13 20 116 -10 -22 3 37 -23 6 39 -21 12 6 -23 58 32 6 0 0 -23 7 9 17 51 10 21 116 -11 -22 35 44 -23 38 39 -21 44 18 -24 30 26 7 0 0 -23 38 51 17 51 7 23 115 -12 -23 7 28 -24 10 17 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- 8 22 2 - 9 26 0 - 7 29 45 -10 18 39 -179 0 0 - 8 17 33 17 36 5 1 239 -9 - 7 45 37 - 8 49 33 - 6 53 23 - 9 42 10 -178 0 0 - 7 41 10 17 36 4 0 239 -8 .. .. .. - 8 13 8 .. .. .. - 9 5 43 Uncertainty in time = +/- 6 secs [Prediction of 2008 May 26.0] Data for the target star ------------------------ * name: 2UCAC 18996809 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 14 36.6431 DE: -30 57 40.355 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .047, .047 ) * V mag [mag]: 12.6 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 273.8002054427 DE(deg): -30.9598173725 * Equation of equinoxes (radians) : 0.000051158195096 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (162) Laurentia approx. diameter [km]: 99 approx. diameter ["]: .060 distance from Earth [AU]: 2.27600 * orbital information: orbit source: Preston date of fit: 2008 May 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 853 number of rejected observations: 81 time covered by the observations: 1902 Apr 07 - 2008 Apr 29 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.015, 92° remarks: * orbital elements for (162) Laurentia : Mean anomaly = 109.47433935 deg Arg. of pericenter = 113.02937638 deg Long. of node = 36.37740639 deg Inclination = 6.07564558 deg Eccentricity = 0.17302647 Semimajor axis = 3.03035712 AU Perihelion dist = 2.50602512 AU Mag: H = 8.86, G = 0.15 Epoch of elements : MJD 54650.73900000 TDT (2008 Jul 03.739) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 3 162 Laurentia 17h 43.9m UT 12.6 18 14 36.643-30 57 40.362UCAC 18996809 0.0 13.5 99 7.4 2.276 -2.254 -1.27 85.5555 -30.961 -84.89 22.88 17.7318 0.00841 -0.19544 -7.50408 -0.32914 0.00086 0.00076 2000 109.3362662008 7 3.00000113.029376 36.377406 6.0756460.17302647 3.0303571 2.5060251 8.8 5.00.15 RATE 1.8683720 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.052 0.049 90 1.82 0.049 0 54612.5020080703_996809 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 26, 14:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org