IOTA/IOTA-ES occultation update for (2375) Radek / TYC 5276-00060-1 event on 2012 Oct 14, 13:35 UT Visible from New Zealand Summary ------- On 2012 Oct 14 UT, the 35 km diameter asteroid (2375) Radek will occult a 10.1 mag star in the constellation Cetus for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.1 mag to 16.2 mag (the magnitude of the asteroid) for at most 2.1 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 29 * date and approx. time of event: 2012 Oct 14, 13:30 - 2012 Oct 14, 13:41 UT * geocentric midpoint of event [JD]: 2456215.06655417 * magnitude of target star: 10.1 * magnitude drop [mag]: 6.1 * estimated maximum duration [s]: 2.1 * Moon: 1 % sunlit, 155° distance * Sun: 159° distance * rough path description: New Zealand Additional comments ------------------- 9" double star The occultation path -------------------- * approximate projected width [km]: 40 * 1 sigma uncertainty interval [path widths]: +/- 2.29 * 1 sigma uncertainty interval [seconds]: +/- 6.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .053 +/- .040) * 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .039", 76° ) * approx speed of asteroid's shadow [km/s]: 16.1298 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5276-00060-1 by 2375 Radek on 2012 Oct 14 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 -51 41 56 13 41 19 15 91 0 -51 30 55 -51 52 57 -50 40 46 -52 43 42 73 0 0 -51 48 13 13 41 18 15 91 -1 -51 37 14 -51 59 14 -50 47 8 -52 49 56 74 0 0 -51 54 13 13 41 16 16 90 -1 -51 43 14 -52 5 13 -50 53 12 -52 55 51 75 0 0 -51 59 55 13 41 15 16 89 -2 -51 48 57 -52 10 54 -50 58 58 -53 1 29 76 0 0 -52 5 19 13 41 14 17 88 -2 -51 54 22 -52 16 17 -51 4 26 -53 6 49 77 0 0 -52 10 26 13 41 12 18 87 -3 -51 59 29 -52 21 23 -51 9 36 -53 11 52 78 0 0 -52 15 15 13 41 11 18 87 -3 -52 4 19 -52 26 12 -51 14 28 -53 16 38 79 0 0 -52 19 46 13 41 9 19 86 -4 -52 8 51 -52 30 43 -51 19 3 -53 21 6 80 0 0 -52 24 0 13 41 7 19 85 -5 -52 13 5 -52 34 56 -51 23 20 -53 25 17 81 0 0 -52 27 57 13 41 6 20 84 -5 -52 17 3 -52 38 53 -51 27 20 -53 29 11 82 0 0 -52 31 36 13 41 4 21 83 -6 -52 20 42 -52 42 32 -51 31 2 -53 32 48 83 0 0 -52 34 59 13 41 2 21 82 -6 -52 24 5 -52 45 53 -51 34 26 -53 36 8 84 0 0 -52 38 4 13 41 1 22 82 -7 -52 27 10 -52 48 58 -51 37 33 -53 39 10 85 0 0 -52 40 51 13 40 59 22 81 -7 -52 29 59 -52 51 45 -51 40 23 -53 41 56 86 0 0 -52 43 22 13 40 57 23 80 -8 -52 32 30 -52 54 16 -51 42 55 -53 44 25 87 0 0 -52 45 36 13 40 55 24 79 -8 -52 34 43 -52 56 29 -51 45 10 -53 46 37 88 0 0 -52 47 32 13 40 53 24 78 -9 -52 36 40 -52 58 25 -51 47 8 -53 48 32 89 0 0 -52 49 12 13 40 51 25 77 -9 -52 38 20 -53 0 5 -51 48 49 -53 50 11 90 0 0 -52 50 34 13 40 49 25 76 -10 -52 39 43 -53 1 27 -51 50 12 -53 51 33 91 0 0 -52 51 40 13 40 47 26 76 -10 -52 40 48 -53 2 33 -51 51 19 -53 52 37 92 0 0 -52 52 29 13 40 45 26 75 -11 -52 41 37 -53 3 21 -51 52 8 -53 53 26 93 0 0 -52 53 0 13 40 43 27 74 -11 -52 42 9 -53 3 53 -51 52 40 -53 53 57 94 0 0 -52 53 15 13 40 41 28 73 -12 -52 42 24 -53 4 8 -51 52 54 -53 54 12 95 0 0 -52 53 13 13 40 38 28 72 -12 -52 42 22 -53 4 6 -51 52 52 -53 54 10 96 0 0 -52 52 54 13 40 36 29 71 -13 -52 42 3 -53 3 47 -51 52 33 -53 53 52 97 0 0 -52 52 19 13 40 34 29 70 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13 30 9 7 259 0 -10 57 13 -11 19 44 -10 5 59 -12 11 37 Uncertainty in time = +/- 7 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: TYC 5276-00060-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 30 07.9832 DE: -12 15 10.415 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .031, .026 ) * V mag [mag]: 10.1 * B mag [mag]: 10.7 * Apparent position with proper motion RA(deg): 22.6996700533 DE(deg): -12.1842528945 * Equation of equinoxes (radians) : 0.000060125587719 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2375) Radek approx. diameter [km]: 35 approx. diameter ["]: .017 distance from Earth [AU]: 2.86900 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 833 number of rejected observations: 28 time covered by the observations: 1937 Jun 12 - 2011 Nov 26 1 sigma uncertainty ellipse (major, minor, PA): 0.045, 0.029, 70° remarks: * orbital elements for (2375) Radek : Mean anomaly = 157.24003308 deg Arg. of pericenter = 101.97694650 deg Long. of node = 110.79196528 deg Inclination = 14.99203420 deg Eccentricity = 0.21430038 Semimajor axis = 3.17420853 AU Perihelion dist = 2.49397445 AU Mag: H = 10.43, G = 0.15 Epoch of elements : MJD 56214.56600000 TDT (2012 Oct 14.566) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 14 2375 Radek 13h 35.8m UT 10.1 1 30 7.983-12 15 10.41TYC 5276-00060-1 10.7 16.2 35 2.1 2.869 -1.791 -9.45 155.0709 -12.251 -27.48 -8.43 13.5973 0.16717 -0.46311 -8.56465 -3.08726 -0.00029 0.00210 2000 156.44426420121010.00000101.976947110.791965 14.9920340.21430038 3.1742085 2.493974410.6 5.00.15 RATE 1.7428140 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.054 0.039 76 3.29 0.039 0 0 2-5 056165.0020121014_0060-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 26, 04:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org