IOTA/IOTA-ES occultation update for (2330) Ontake / TYC 5718-00959-1 event on 2007 Jul 04, 13:19 UT Visible from Indonesia, near Hawaii Summary ------- On 2007 Jul 04 UT, the 33 km diameter asteroid (2330) Ontake will occult a 11.1 mag star in the constellation Sagittarius for observers along a path across Indonesia, near Hawaii. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.5 mag to 15.6 mag (the magnitude of the asteroid) for at most 2.7 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: 20 * date and approx. time of event: 2007 Jul 04, 13:10 - 2007 Jul 04, 13:27 UT * magnitude of target star: 11.1 * magnitude drop [mag]: 4.5 * estimated maximum duration [s]: 2.7 * Moon: 82 % sunlit, 48° distance * Sun: 172° distance * rough path description: Indonesia, near Hawaii The occultation path -------------------- * approximate projected width [km]: 34 * 1 sigma uncertainty interval [path widths]: +/- 3.36 * 1 sigma uncertainty interval [seconds]: +/- 12.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .108 +/- .071) * 1 sigma uncertainty ellipse (major, minor, PA): ( .108", .071", 91° ) * approx speed of asteroid's shadow [km/s]: 12.1401 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5718-00959-1 by 2330 Ontake on 2007 Jul 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 72 0 0 0 3 40 13 27 14 1 105 -2 0 13 18 - 0 5 58 1 18 15 .. .. .. 73 0 0 - 0 11 59 13 27 14 2 105 -3 - 0 2 22 - 0 21 36 1 2 30 .. .. .. 74 0 0 - 0 27 18 13 27 13 3 105 -5 - 0 17 41 - 0 36 54 0 47 5 .. .. .. 75 0 0 - 0 42 16 13 27 13 4 105 -6 - 0 32 41 - 0 51 51 0 32 0 .. .. .. 76 0 0 - 0 56 54 13 27 12 5 105 -7 - 0 47 19 - 1 6 28 0 17 16 .. .. .. 77 0 0 - 1 11 11 13 27 11 6 105 -8 - 1 1 37 - 1 20 45 0 2 53 - 2 24 48 78 0 0 - 1 25 7 13 27 10 7 105 -9 - 1 15 34 - 1 34 40 - 0 11 9 - 2 38 38 79 0 0 - 1 38 43 13 27 9 8 105 -10 - 1 29 10 - 1 48 15 - 0 24 50 - 2 52 7 80 0 0 - 1 51 57 13 27 7 9 105 -11 - 1 42 25 - 2 1 28 - 0 38 10 - 3 5 16 81 0 0 - 2 4 49 13 27 6 10 105 -12 - 1 55 18 - 2 14 20 - 0 51 8 - 3 18 3 82 0 0 - 2 17 20 13 27 4 11 105 -13 - 2 7 50 - 2 26 50 - 1 3 45 - 3 30 29 83 0 0 - 2 29 30 13 27 2 12 105 -14 - 2 20 0 - 2 38 59 - 1 16 0 - 3 42 33 84 0 0 - 2 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Data for the target star ------------------------ * name: TYC 5718-00959-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 00 44.9834 DE: -14 52 04.308 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .019 ) * V mag [mag]: 11.1 * B mag [mag]: 12.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2330) Ontake approx. diameter [km]: 33 approx. diameter ["]: .022 distance from Earth [AU]: 2.04000 * orbital information: orbit source: Preston date of fit: 2007 Jun 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 653 number of rejected observations: 20 time covered by the observations: 1977 Feb 18 - 2007 Jun 28 1 sigma uncertainty ellipse (major, minor, PA): 0.106, 0.068, 91° remarks: * orbital elements for (2330) Ontake : Mean anomaly = 6.50602576 deg Arg. of pericenter = 135.88261188 deg Long. of node = 140.63441932 deg Inclination = 8.66152149 deg Eccentricity = 0.04136347 Semimajor axis = 3.18072806 AU Perihelion dist = 3.04916211 AU Mag: H = 11.38, G = 0.15 Epoch of elements : MJD 54285.55500000 TDT (2007 Jul 04.555) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Jul 04 2330 Ontake 13h 18.8m UT 11.1 19 0 44.983-14 52 4.31TYC 5718-00959-1 12.3 15.6 33 2.7 2.040 -1.965 -7.78 163.315 -14.865 -18.60 22.88 13.3132 -.07034 .25791 -6.61024 -1.80478 -0.00021 -0.00078 2000 5.540868232007 629.00000135.882612140.634419 8.6615210.041363473.180728063.0491621111.35 0.15 RATE 1.7374578 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.108 0.071 91.0 4.360 0.075 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jun 29, 02:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org