IOTA/IOTA-ES occultation update for (21) Lutetia / 2UCAC 22046650 event on 2007 Oct 03, 02:26 UT Visible from Chile, Bolivia Summary ------- On 2007 Oct 03 UT, the 96 km diameter asteroid (21) Lutetia will occult a 11.7 mag star in the constellation Ophiuchus for observers along a path across Chile, Bolivia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 12.0 mag (the magnitude of the asteroid) for at most 3.4 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: 76 * date and approx. time of event: 2007 Oct 03, 02:23 - 2007 Oct 03, 02:30 UT * midpoint of event [JD]: 2454376.60197083 * magnitude of target star: 11.7 * magnitude drop [mag]: 0.9 * estimated maximum duration [s]: 3.4 * Moon: 54 % sunlit, 166° distance * Sun: 72° distance * rough path description: Chile, Bolivia The occultation path -------------------- * approximate projected width [km]: 97 * 1 sigma uncertainty interval [path widths]: +/- 0.73 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .045 +/- .044) * 1 sigma uncertainty ellipse (major, minor, PA): ( .045", .044", 90° ) * approx speed of asteroid's shadow [km/s]: 28.0581 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 22046650 by 21 Lutetia on 2007 Oct 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 122 0 0 .. .. .. .. .. .. .. .. .. - 3 13 14 .. .. .. - 3 55 36 .. .. .. 123 0 0 - 3 11 52 2 23 6 1 114 71 - 3 40 51 - 2 42 55 - 4 23 15 - 2 0 43 124 0 0 - 3 39 35 2 23 6 2 114 72 - 4 8 36 - 3 10 37 - 4 51 2 - 2 28 23 125 0 0 - 4 7 25 2 23 6 3 114 73 - 4 36 27 - 3 38 25 - 5 18 55 - 2 56 9 126 0 0 - 4 35 20 2 23 6 4 114 74 - 5 4 24 - 4 6 19 - 5 46 54 - 3 24 2 127 0 0 - 5 3 21 2 23 6 5 114 75 - 5 32 26 - 4 34 19 - 6 14 57 - 3 52 0 128 0 0 - 5 31 27 2 23 7 6 114 76 - 6 0 33 - 5 2 24 - 6 43 6 - 4 20 3 129 0 0 - 5 59 37 2 23 7 8 114 77 - 6 28 43 - 5 30 33 - 7 11 17 - 4 48 11 130 0 0 - 6 27 49 2 23 8 9 114 78 - 6 56 56 - 5 58 45 - 7 39 32 - 5 16 21 131 0 0 - 6 56 4 2 23 9 10 114 79 - 7 25 12 - 6 26 59 - 8 7 48 - 5 44 35 132 0 0 - 7 24 21 2 23 10 11 114 80 - 7 53 29 - 6 55 15 - 8 36 6 - 6 12 50 133 0 0 - 7 52 38 2 23 10 12 114 81 - 8 21 47 - 7 23 32 - 9 4 24 - 6 41 6 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.. -13 6 12 .. .. .. Data for the target star ------------------------ * name: 2UCAC 22046650 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 21 48.1256 DE: -24 29 41.744 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .043, .043 ) * V mag [mag]: 11.7 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 260.5690541519 DE(deg): -24.5045554295 * Equation of equinoxes (radians) : 0.000029562059835 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (21) Lutetia approx. diameter [km]: 96 approx. diameter ["]: .060 distance from Earth [AU]: 2.20200 * orbital information: orbit source: Preston date of fit: 2007 Aug 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1244 number of rejected observations: 189 time covered by the observations: 1906 Dec 17 - 2007 Jul 19 1 sigma uncertainty ellipse (major, minor, PA): 0.011, 0.008, 98° remarks: * orbital elements for (21) Lutetia : Mean anomaly = 328.81665828 deg Arg. of pericenter = 249.95062405 deg Long. of node = 80.91286451 deg Inclination = 3.06430321 deg Eccentricity = 0.16315085 Semimajor axis = 2.43573922 AU Perihelion dist = 2.03834630 AU Mag: H = 7.33, G = 0.11 Epoch of elements : MJD 54376.10200000 TDT (2007 Oct 03.102) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 03 21 Lutetia 2h 26.8m UT 11.7 17 21 48.126-24 29 41.742UCAC 22046650 0.0 12.0 96 3.4 2.202 4.616 -5.50 212.320 -24.494 140.61 -3.77 2.4473 -.01343 -.13920 15.77667 -1.37828 0.00511 -0.00038 2000 327.2345712007 927.00000249.950624 80.912865 3.0643030.163150852.435739222.038346307.355 0.11 RATE 2.5927340 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.045 0.044 90.5 1.730 0.044 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 03, 05:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org