IOTA/IOTA-ES occultation update for (1578) Kirkwood / TYC 0614-01151-1 event on 2012 Nov 21, 21:47 UT Visible from Japan, China, India Summary ------- On 2012 Nov 21 UT, the 57 km diameter asteroid (1578) Kirkwood will occult a 11.6 mag star in the constellation Pisces for observers along a path across Japan, China, India. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.7 mag to 15.3 mag (the magnitude of the asteroid) for at most 8.7 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: 54 * date and approx. time of event: 2012 Nov 21, 12:38 - 2012 Nov 21, 13:03 UT * geocentric midpoint of event [JD]: 2456253.03660833 * magnitude of target star: 11.6 * magnitude drop [mag]: 3.7 * estimated maximum duration [s]: 8.7 * Moon: 59 % sunlit, 43° distance * Sun: 143° distance * rough path description: Japan, China, India The occultation path -------------------- * approximate projected width [km]: 66 * 1 sigma uncertainty interval [path widths]: +/- 1.17 * 1 sigma uncertainty interval [seconds]: +/- 12.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .050 +/- .041) * 1 sigma uncertainty ellipse (major, minor, PA): ( .050", .040", 74° ) * approx speed of asteroid's shadow [km/s]: 6.5928 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0614-01151-1 by 1578 Kirkwood on 2012 Nov 21 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 64 0 0 19 50 27 13 3 54 31 92 -1 20 9 17 19 31 42 20 53 35 18 48 2 65 0 0 20 8 58 13 3 45 31 93 -2 20 27 49 19 50 11 21 12 11 19 6 28 66 0 0 20 27 41 13 3 35 32 93 -3 20 46 33 20 8 52 21 30 58 19 25 6 67 0 0 20 46 35 13 3 25 33 94 -4 21 5 29 20 27 45 21 49 58 19 43 56 68 0 0 21 5 41 13 3 14 34 94 -5 21 24 36 20 46 50 22 9 8 20 2 57 69 0 0 21 24 57 13 3 4 35 95 -6 21 43 54 21 6 5 22 28 29 20 22 9 70 0 0 21 44 24 13 2 53 36 96 -7 22 3 22 21 25 30 22 48 1 20 41 31 71 0 0 22 4 1 13 2 42 37 96 -8 22 23 0 21 45 5 23 7 42 21 1 3 72 0 0 22 23 47 13 2 31 37 97 -8 22 42 48 22 4 50 23 27 33 21 20 45 73 0 0 22 43 42 13 2 19 38 98 -9 23 2 44 22 24 44 23 47 33 21 40 35 74 0 0 23 3 46 13 2 8 39 98 -10 23 22 50 22 44 46 24 7 41 22 0 35 75 0 0 23 23 58 13 1 56 40 99 -11 23 43 3 23 4 57 24 27 58 22 20 43 76 0 0 23 44 18 13 1 44 41 100 -12 24 3 24 23 25 15 24 48 22 22 40 58 77 0 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Uncertainty in time = +/- 13 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 0614-01151-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 24 37.4989 DE: +08 07 00.613 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .027, .029 ) * V mag [mag]: 11.6 * B mag [mag]: 12.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1578) Kirkwood approx. diameter [km]: 57 approx. diameter ["]: .034 distance from Earth [AU]: 2.31800 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1085 number of rejected observations: 56 time covered by the observations: 1944 Feb 21 - 2012 Oct 16 1 sigma uncertainty ellipse (major, minor, PA): 0.043, 0.028, 68° remarks: * orbital elements for (1578) Kirkwood : Mean anomaly = 332.90096757 deg Arg. of pericenter = 3.10758813 deg Long. of node = 74.01869728 deg Inclination = 0.81108875 deg Eccentricity = 0.23812678 Semimajor axis = 3.93181914 AU Perihelion dist = 2.99554770 AU Mag: H = 10.17, G = 0.15 Epoch of elements : MJD 56252.90800000 TDT (2012 Nov 21.908) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 21 1578 Kirkwood 12h 52.7m UT 11.6 1 24 37.499 8 7 0.61TYC 0614-01151-1 12.0 15.3 57 8.7 2.318 -0.900 -4.48 127.0493 8.119 -16.67 -20.07 12.8786 -0.16039 0.48801 -3.52857 -1.18157 0.00333 0.00139 2000 332.53334020121119.00000 3.107588 74.018697 0.8110890.23812678 3.9318191 2.995547710.3 5.00.15 RATE 1.2641940 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.050 0.040 74 2.17 0.040 0 0-1 3 056247.0020121121_1151-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 21:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org