IOTA/IOTA-ES occultation update for (626) Notburga / TYC 6709-00601-1 event on 2007 Aug 03, 19:56 UT Visible from Africa Summary ------- On 2007 Aug 03 UT, the 101 km diameter asteroid (626) Notburga will occult a 10.5 mag star in the constellation Hydra 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 4.5 mag to 15.0 mag (the magnitude of the asteroid) for at most 4.6 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: 99 * date and approx. time of event: 2007 Aug 03, 19:51 - 2007 Aug 03, 20:01 UT * midpoint of event [JD]: 2454316.33068333 * magnitude of target star: 10.5 * magnitude drop [mag]: 4.5 * estimated maximum duration [s]: 4.6 * Moon: 73 % sunlit, 158° distance * Sun: 75° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 101 * 1 sigma uncertainty interval [path widths]: +/- 0.28 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .012 +/- .012) * 1 sigma uncertainty ellipse (major, minor, PA): ( .013", .011", 232° ) * approx speed of asteroid's shadow [km/s]: 21.9838 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6709-00601-1 by 626 Notburga on 2007 Aug 03 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 -140 0 0 9 16 48 19 51 21 0 120 66 8 45 0 9 48 36 8 27 12 10 6 25 -139 0 0 8 41 35 19 51 21 2 121 66 8 9 45 9 13 26 7 51 55 9 31 16 -138 0 0 8 6 8 19 51 21 3 121 67 7 34 15 8 38 1 7 16 24 8 55 53 -137 0 0 7 30 28 19 51 22 4 121 67 6 58 33 8 2 24 6 40 41 8 20 17 -136 0 0 6 54 37 19 51 22 5 121 68 6 22 39 7 26 34 6 4 46 7 44 28 -135 0 0 6 18 34 19 51 23 6 121 69 5 46 35 6 50 33 5 28 41 7 8 29 -134 0 0 5 42 22 19 51 24 7 121 69 5 10 21 6 14 23 4 52 26 6 32 19 -133 0 0 5 6 1 19 51 24 9 121 69 4 33 58 5 38 3 4 16 2 5 56 0 -132 0 0 4 29 32 19 51 25 10 121 70 3 57 29 5 1 36 3 39 32 5 19 33 -131 0 0 3 52 57 19 51 26 11 122 70 3 20 52 4 25 1 3 2 55 4 43 0 -130 0 0 3 16 16 19 51 28 12 122 70 2 44 11 3 48 22 2 26 13 4 6 20 -129 0 0 2 39 32 19 51 29 13 122 71 2 7 26 3 11 38 1 49 28 3 29 37 -128 0 0 2 2 44 19 51 30 14 122 71 1 30 38 2 34 51 1 12 40 2 52 50 -127 0 0 1 25 55 19 51 32 16 122 71 0 53 49 1 58 2 0 35 51 2 16 1 -126 0 0 0 49 5 19 51 33 17 122 71 0 16 59 1 21 12 - 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Data for the target star ------------------------ * name: TYC 6709-00601-1 * constellation : Hydra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 55 17.0828 DE: -29 55 49.562 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .020 ) * V mag [mag]: 10.5 * B mag [mag]: 11.6 * Apparent position with proper motion RA(deg): 193.9222143425 DE(deg): -29.9739572952 * Equation of equinoxes (radians) : 0.000032350552040 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (626) Notburga approx. diameter [km]: 101 approx. diameter ["]: .043 distance from Earth [AU]: 3.23400 * orbital information: orbit source: Preston date of fit: 2007 Jul 01 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 603 number of rejected observations: 49 time covered by the observations: 1907 Feb 11 - 2007 May 27 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.020, -165° remarks: * orbital elements for (626) Notburga : Mean anomaly = 213.72293263 deg Arg. of pericenter = 43.52246324 deg Long. of node = 341.78053725 deg Inclination = 25.34485180 deg Eccentricity = 0.24234018 Semimajor axis = 2.57455915 AU Perihelion dist = 1.95064001 AU Mag: H = 9.11, G = 0.15 Epoch of elements : MJD 54315.83100000 TDT (2007 Aug 03.831) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 03 626 Notburga 19h 56.2m UT 10.5 12 55 17.083-29 55 49.56TYC 6709-00601-1 11.7 15.0 101 4.6 3.234 2.564 -5.33 -57.240 -29.929 -117.49 17.44 19.9364 .00486 .03188 12.25250 -1.96007 0.00468 -0.00279 2000 212.3317222007 729.00000 43.522463341.780537 25.3448520.242340182.574559151.950640019.005 0.15 RATE 2.3858870 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.013 0.011 231.9 1.280 0.012 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 09, 18:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org