IOTA/IOTA-ES occultation update for (357) Ninina / TYC 6343-01606-1 event on 2007 Nov 04, 00:08 UT Visible from Brazil, Bolivia, Chile Summary ------- On 2007 Nov 04 UT, the 106 km diameter asteroid (357) Ninina will occult a 12.0 mag star in the constellation Capricornus for observers along a path across Brazil, Bolivia, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.5 mag to 14.4 mag (the magnitude of the asteroid) for at most 5.9 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: 88 * date and approx. time of event: 2007 Nov 04, 00:02 - 2007 Nov 04, 00:14 UT * magnitude of target star: 12.0 * magnitude drop [mag]: 2.5 * estimated maximum duration [s]: 5.9 * Moon: 30 % sunlit, 153° distance * Sun: 87° distance * rough path description: Brazil, Bolivia, Chile The occultation path -------------------- * approximate projected width [km]: 106 * 1 sigma uncertainty interval [path widths]: +/- 0.56 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .028", 92° ) * approx speed of asteroid's shadow [km/s]: 18.0283 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6343-01606-1 by 357 Ninina on 2007 Nov 04 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 176 0 0 - 4 57 20 0 2 58 1 111 80 - 5 28 6 - 4 26 34 - 6 2 34 - 3 52 7 177 0 0 - 5 20 6 0 2 58 2 111 80 - 5 50 51 - 4 49 21 - 6 25 19 - 4 14 55 178 0 0 - 5 42 46 0 2 59 3 111 80 - 6 13 31 - 5 12 2 - 6 47 57 - 4 37 37 179 0 0 - 6 5 21 0 2 59 4 110 80 - 6 36 4 - 5 34 38 - 7 10 30 - 5 0 14 180 0 0 - 6 27 48 0 3 0 5 110 80 - 6 58 31 - 5 57 6 - 7 32 55 - 5 22 43 -179 0 0 - 6 50 9 0 3 0 6 110 80 - 7 20 50 - 6 19 28 - 7 55 13 - 5 45 6 -178 0 0 - 7 12 22 0 3 1 7 110 80 - 7 43 2 - 6 41 42 - 8 17 24 - 6 7 22 -177 0 0 - 7 34 27 0 3 2 8 110 79 - 8 5 6 - 7 3 48 - 8 39 26 - 6 29 29 -176 0 0 - 7 56 23 0 3 3 9 110 79 - 8 27 0 - 7 25 45 - 9 1 19 - 6 51 28 -175 0 0 - 8 18 10 0 3 4 10 110 78 - 8 48 46 - 7 47 34 - 9 23 3 - 7 13 18 -174 0 0 - 8 39 47 0 3 5 11 110 77 - 9 10 22 - 8 9 13 - 9 44 38 - 7 34 58 -173 0 0 - 9 1 14 0 3 6 12 109 77 - 9 31 48 - 8 30 42 -10 6 2 - 7 56 29 -172 0 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Data for the target star ------------------------ * name: TYC 6343-01606-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 43 02.4219 DE: -20 44 31.584 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .025 ) * V mag [mag]: 12.0 * B mag [mag]: 13.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (357) Ninina approx. diameter [km]: 106 approx. diameter ["]: .050 distance from Earth [AU]: 2.92000 * orbital information: orbit source: Preston date of fit: 2007 Oct 23 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 705 number of rejected observations: 81 time covered by the observations: 1907 Sep 19 - 2007 Sep 16 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.012, 94° remarks: * orbital elements for (357) Ninina : Mean anomaly = 305.68383959 deg Arg. of pericenter = 250.68180899 deg Long. of node = 137.88357062 deg Inclination = 15.08465893 deg Eccentricity = 0.07298500 Semimajor axis = 3.14993806 AU Perihelion dist = 2.92003983 AU Mag: H = 8.64, G = 0.15 Epoch of elements : MJD 54408.00600000 TDT (2007 Nov 04.006) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Nov 04 357 Ninina 0h 8.9m UT 12.0 20 43 2.422-20 44 31.58TYC 6343-01606-1 13.0 14.4 106 5.9 2.920 2.180 2.21 265.677 -20.743 173.68 -15.19 0.1477 .00036 -.01616 10.14930 0.73250 0.00571 0.00152 2000 304.27238620071027.00000250.681809137.883571 15.0846590.072985003.149938062.920039838.725 0.15 RATE 1.7629950 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.029 0.028 91.6 1.560 0.028 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Oct 23, 22:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org