IOTA/IOTA-ES occultation update for (1116) Catriona / TYC 2415-00977-1 event on 2007 Sep 01, 01:03 UT Visible from Madagascar Summary ------- On 2007 Sep 01 UT, the 39 km diameter asteroid (1116) Catriona will occult a 10.4 mag star in the constellation Auriga for observers along a path across Madagascar. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.1 mag to 14.5 mag (the magnitude of the asteroid) for at most 1.4 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: 61 * date and approx. time of event: 2007 Sep 01, 01:00 - 2007 Sep 01, 01:06 UT * magnitude of target star: 10.4 * magnitude drop [mag]: 4.1 * estimated maximum duration [s]: 1.4 * Moon: 82 % sunlit, 55° distance * Sun: 76° distance * rough path description: Madagascar The occultation path -------------------- * approximate projected width [km]: 44 * 1 sigma uncertainty interval [path widths]: +/- 1.01 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .023", 86° ) * approx speed of asteroid's shadow [km/s]: 28.3827 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2415-00977-1 by 1116 Catriona on 2007 Sep 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 30 0 0 -35 9 48 1 0 16 1 41 -41 -35 27 41 -34 52 0 -36 4 1 .. .. .. 31 0 0 -34 14 5 1 0 16 2 41 -41 -34 31 57 -33 56 18 -35 8 14 .. .. .. 32 0 0 -33 17 54 1 0 16 3 40 -40 -33 35 43 -33 0 8 -34 11 57 -32 24 29 33 0 0 -32 21 17 1 0 17 4 40 -40 -32 39 4 -32 3 33 -33 15 14 -31 27 58 34 0 0 -31 24 17 1 0 17 6 39 -39 -31 42 2 -31 6 36 -32 18 7 -30 31 5 35 0 0 -30 26 58 1 0 18 7 39 -39 -30 44 40 -30 9 20 -31 20 39 -29 33 55 36 0 0 -29 29 23 1 0 19 8 38 -38 -29 47 2 -29 11 48 -30 22 55 -28 36 29 37 0 0 -28 31 36 1 0 20 10 38 -37 -28 49 12 -28 14 5 -29 24 57 -27 38 53 38 0 0 -27 33 40 1 0 21 11 37 -37 -27 51 11 -27 16 12 -28 26 48 -26 41 7 39 0 0 -26 35 37 1 0 22 12 37 -36 -26 53 5 -26 18 14 -27 28 33 -25 43 17 40 0 0 -25 37 32 1 0 23 14 36 -35 -25 54 56 -25 20 13 -26 30 15 -24 45 26 41 0 0 -24 39 29 1 0 24 15 36 -34 -24 56 47 -24 22 14 -25 31 57 -23 47 36 42 0 0 -23 41 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Data for the target star ------------------------ * name: TYC 2415-00977-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 24 09.4900 DE: +37 26 50.596 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .015, .016 ) * V mag [mag]: 10.4 * B mag [mag]: 10.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1116) Catriona approx. diameter [km]: 39 approx. diameter ["]: .023 distance from Earth [AU]: 2.30800 * orbital information: orbit source: Preston date of fit: 2007 Aug 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 632 number of rejected observations: 34 time covered by the observations: 1908 Jan 05 - 2006 Dec 08 1 sigma uncertainty ellipse (major, minor, PA): 0.026, 0.016, 85° remarks: * orbital elements for (1116) Catriona : Mean anomaly = 346.30529666 deg Arg. of pericenter = 83.16245800 deg Long. of node = 356.59320503 deg Inclination = 16.53096732 deg Eccentricity = 0.23008312 Semimajor axis = 2.92290689 AU Perihelion dist = 2.25039535 AU Mag: H = 9.65, G = 0.15 Epoch of elements : MJD 54344.04400000 TDT (2007 Sep 01.044) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Sep 01 1116 Catriona 1h 3.6m UT 10.4 5 24 9.490 37 26 50.60TYC 2415-00977-1 10.7 14.5 39 1.4 2.308 4.833 20.40 -274.682 37.441 -195.83 8.48 1.0598 .15454 -.43486 15.09958 5.35189 -0.00521 0.00000 2000 345.5076832007 828.00000 83.162458356.593205 16.5309670.230083122.922906892.250395359.7 5 0.15 RATE 1.9723390 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.030 0.023 86.3 2.010 0.023 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Aug 28, 22:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org