IOTA/IOTA-ES occultation update for (7275) 1983 CY2 / TYC 2364-00638-1 event on 2012 Nov 18, 06:36 UT Visible from Brazil, Peru Summary ------- On 2012 Nov 18 UT, the 13 km diameter asteroid (7275) 1983 CY2 will occult a 9.2 mag star in the constellation Perseus for observers along a path across Brazil, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.7 mag to 15.9 mag (the magnitude of the asteroid) for at most 1.1 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: 9 * date and approx. time of event: 2012 Nov 18, 06:29 - 2012 Nov 18, 06:43 UT * geocentric midpoint of event [JD]: 2456249.7754625 * magnitude of target star: 9.2 * magnitude drop [mag]: 6.7 * estimated maximum duration [s]: 1.1 * Moon: 25 % sunlit, 124° distance * Sun: 165° distance * rough path description: Brazil, Peru The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 7.62 * 1 sigma uncertainty interval [seconds]: +/- 12.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .125 +/- .079) * 1 sigma uncertainty ellipse (major, minor, PA): ( .126", .076", 79° ) * approx speed of asteroid's shadow [km/s]: 11.6381 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2364-00638-1 by 7275 1983 CY2 on 2012 Nov 18 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 -157 0 0 -38 1 59 6 43 49 1 43 -15 -37 55 25 -38 8 34 .. .. .. .. .. .. -156 0 0 -37 12 28 6 43 49 2 42 -16 -37 5 57 -37 19 1 .. .. .. -39 0 33 -155 0 0 -36 23 0 6 43 48 3 42 -17 -36 16 30 -36 29 30 .. .. .. -38 10 24 -154 0 0 -35 33 36 6 43 47 4 41 -18 -35 27 9 -35 40 3 .. .. .. -37 20 19 -153 0 0 -34 44 20 6 43 46 6 41 -19 -34 37 55 -34 50 45 .. .. .. -36 30 20 -152 0 0 -33 55 14 6 43 45 7 40 -20 -33 48 52 -34 1 36 -32 13 28 -35 40 30 -151 0 0 -33 6 20 6 43 43 8 40 -21 -33 0 1 -33 12 40 -31 25 15 -34 50 52 -150 0 0 -32 17 41 6 43 41 9 39 -23 -32 11 25 -32 23 59 -30 37 17 -34 1 28 -149 0 0 -31 29 20 6 43 39 10 38 -24 -31 23 6 -31 35 35 -29 49 37 -33 12 21 -148 0 0 -30 41 18 6 43 36 11 38 -25 -30 35 7 -30 47 30 -29 2 17 -32 23 33 -147 0 0 -29 53 37 6 43 33 13 37 -26 -29 47 29 -29 59 47 -28 15 19 -31 35 6 -146 0 0 -29 6 20 6 43 30 14 37 -27 -29 0 14 -29 12 27 -27 28 44 -30 47 2 -145 0 0 -28 19 28 6 43 26 15 36 -28 -28 13 25 -28 25 32 -26 42 35 -29 59 24 -144 0 0 -27 33 4 6 43 23 16 36 -30 -27 27 4 -27 39 5 -25 56 53 -29 12 13 -143 0 0 -26 47 8 6 43 19 17 35 -31 -26 41 11 -26 53 6 -25 11 40 -28 25 31 -142 0 0 -26 1 43 6 43 14 18 35 -32 -25 55 48 -26 7 39 -24 26 57 -27 39 19 -141 0 0 -25 16 50 6 43 10 19 34 -33 -25 10 58 -25 22 43 -23 42 46 -26 53 40 -140 0 0 -24 32 30 6 43 5 20 34 -34 -24 26 41 -24 38 20 -22 59 8 -26 8 35 -139 0 0 -23 48 45 6 43 0 22 33 -35 -23 42 58 -23 54 33 -22 16 4 -25 24 5 -138 0 0 -23 5 36 6 42 55 23 33 -36 -22 59 52 -23 11 21 -21 33 37 -24 40 11 -137 0 0 -22 23 4 6 42 49 24 32 -38 -22 17 23 -22 28 46 -20 51 45 -23 56 55 -136 0 0 -21 41 10 6 42 44 25 32 -39 -21 35 31 -21 46 50 -20 10 32 -23 14 17 -135 0 0 -20 59 56 6 42 38 26 31 -40 -20 54 19 -21 5 33 -19 29 57 -22 32 20 -134 0 0 -20 19 21 6 42 32 27 30 -41 -20 13 47 -20 24 56 -18 50 1 -21 51 3 -133 0 0 -19 39 27 6 42 25 28 30 -42 -19 33 56 -19 44 59 -18 10 46 -21 10 27 -132 0 0 -19 0 15 6 42 19 29 29 -43 -18 54 46 -19 5 45 -17 32 11 -20 30 34 -131 0 0 -18 21 45 6 42 12 30 29 -44 -18 16 18 -18 27 12 -16 54 18 -19 51 24 -130 0 0 -17 43 58 6 42 5 31 28 -45 -17 38 33 -17 49 23 -16 17 8 -19 12 57 -129 0 0 -17 6 54 6 41 58 32 27 -46 -17 1 32 -17 12 16 -15 40 40 -18 35 15 -128 0 0 -16 30 34 6 41 51 33 27 -47 -16 25 14 -16 35 54 -15 4 55 -17 58 17 -127 0 0 -15 54 58 6 41 44 34 26 -48 -15 49 40 -16 0 16 -14 29 53 -17 22 4 -126 0 0 -15 20 7 6 41 36 35 26 -49 -15 14 51 -15 25 23 -13 55 36 -16 46 37 -125 0 0 -14 46 1 6 41 28 36 25 -50 -14 40 47 -14 51 15 -13 22 3 -16 11 56 -124 0 0 -14 12 40 6 41 21 37 24 -51 -14 7 29 -14 17 52 -12 49 14 -15 38 1 -123 0 0 -13 40 5 6 41 13 37 23 -52 -13 34 55 -13 45 15 -12 17 10 -15 4 52 -122 0 0 -13 8 15 6 41 5 38 23 -53 -13 3 8 -13 13 23 -11 45 51 -14 32 30 -121 0 0 -12 37 12 6 40 57 39 22 -54 -12 32 6 -12 42 18 -11 15 17 -14 0 54 -120 0 0 -12 6 54 6 40 48 40 21 -55 -12 1 50 -12 11 58 -10 45 28 -13 30 5 -119 0 0 -11 37 22 6 40 40 41 20 -56 -11 32 20 -11 42 25 -10 16 25 -13 0 4 -118 0 0 -11 8 37 6 40 31 41 20 -57 -11 3 37 -11 13 38 - 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Uncertainty in time = +/- 14 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 2364-00638-1 * constellation : Perseus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 49 17.9110 DE: +34 25 36.578 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .029, .018 ) * V mag [mag]: 9.2 * B mag [mag]: 10.4 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (7275) 1983 CY2 approx. diameter [km]: 13 approx. diameter ["]: .010 distance from Earth [AU]: 1.83700 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 810 number of rejected observations: 8 time covered by the observations: 1955 Oct 24 - 2012 Nov 04 1 sigma uncertainty ellipse (major, minor, PA): 0.123, 0.074, 78° remarks: * orbital elements for (7275) 1983 CY2 : Mean anomaly = 343.73263278 deg Arg. of pericenter = 112.69664540 deg Long. of node = 326.23622903 deg Inclination = 9.17057615 deg Eccentricity = 0.06775856 Semimajor axis = 2.99584863 AU Perihelion dist = 2.79285423 AU Mag: H = 12.02, G = 0.15 Epoch of elements : MJD 56249.27500000 TDT (2012 Nov 18.275) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 18 7275 1983 CY2 6h 36.7m UT 9.2 3 49 17.911 34 25 36.58TYC 2364-00638-1 10.4 15.9 13 1.1 1.837 -2.496 -5.96 -99.5552 34.428 77.14 -19.33 6.6111 0.11650 -0.60746 -6.45034 -1.24214 -0.00031 -0.00154 2000 341.969690201211 9.00000112.696645326.236229 9.1705760.06775856 2.9958486 2.792854211.9 5.00.15 RATE 1.9007470 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.126 0.076 79 8.62 0.074 0 0 0-2 056247.0020121118_0638-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org