IOTA/IOTA-ES occultation update for (2386) Nikonov / TYC 0620-00382-1 event on 2012 Oct 22, 17:55 UT Visible from Philippines, SE Asia, Africa Summary ------- On 2012 Oct 22 UT, the 13 km diameter asteroid (2386) Nikonov will occult a 10.0 mag star in the constellation Pisces for observers along a path across Philippines, SE Asia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.0 mag to 15.0 mag (the magnitude of the asteroid) for at most 1.2 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: 15 * date and approx. time of event: 2012 Oct 22, 17:46 - 2012 Oct 22, 18:04 UT * geocentric midpoint of event [JD]: 2456223.2471 * magnitude of target star: 10.0 * magnitude drop [mag]: 5.0 * estimated maximum duration [s]: 1.2 * Moon: 57 % sunlit, 77° distance * Sun: 173° distance * rough path description: Philippines, SE Asia, Africa The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 4.51 * 1 sigma uncertainty interval [seconds]: +/- 6.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .063 +/- .052) * 1 sigma uncertainty ellipse (major, minor, PA): ( .066", .047", 62° ) * approx speed of asteroid's shadow [km/s]: 11.3520 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0620-00382-1 by 2386 Nikonov on 2012 Oct 22 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 - 1 0 0 -18 17 11 18 4 59 5 73 0 -18 13 26 -18 20 56 -17 39 40 -18 54 47 0 0 0 -18 0 20 18 4 58 6 72 -1 -17 56 35 -18 4 5 -17 22 48 -18 37 57 1 0 0 -17 43 20 18 4 57 7 72 -2 -17 39 35 -17 47 5 -17 5 46 -18 20 58 2 0 0 -17 26 12 18 4 56 8 72 -3 -17 22 26 -17 29 57 -16 48 37 -18 3 52 3 0 0 -17 8 56 18 4 54 9 71 -4 -17 5 10 -17 12 41 -16 31 20 -17 46 37 4 0 0 -16 51 32 18 4 53 10 71 -5 -16 47 47 -16 55 18 -16 13 56 -17 29 14 5 0 0 -16 34 2 18 4 51 11 71 -6 -16 30 16 -16 37 48 -15 56 24 -17 11 45 6 0 0 -16 16 25 18 4 49 12 71 -7 -16 12 39 -16 20 10 -15 38 46 -16 54 9 7 0 0 -15 58 41 18 4 47 13 70 -8 -15 54 55 -16 2 27 -15 21 1 -16 36 26 8 0 0 -15 40 51 18 4 44 14 70 -9 -15 37 5 -15 44 37 -15 3 11 -16 18 37 9 0 0 -15 22 56 18 4 42 15 70 -10 -15 19 10 -15 26 42 -14 45 15 -16 0 42 10 0 0 -15 4 55 18 4 39 16 69 -11 -15 1 9 -15 8 41 -14 27 13 -15 42 42 11 0 0 -14 46 49 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38 1 285 -7 - 1 12 12 - 1 19 39 .. .. .. - 1 53 14 Uncertainty in time = +/- 7 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: TYC 0620-00382-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 24 34.6995 DE: +14 41 21.220 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .021 ) * V mag [mag]: 10.0 * B mag [mag]: 10.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2386) Nikonov approx. diameter [km]: 13 approx. diameter ["]: .011 distance from Earth [AU]: 1.62800 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 931 number of rejected observations: 15 time covered by the observations: 1941 Sep 20 - 2012 Oct 05 1 sigma uncertainty ellipse (major, minor, PA): 0.063, 0.043, 59° remarks: * orbital elements for (2386) Nikonov : Mean anomaly = 55.28627814 deg Arg. of pericenter = 310.24717803 deg Long. of node = 5.27295467 deg Inclination = 9.07313577 deg Eccentricity = 0.15505931 Semimajor axis = 2.81562887 AU Perihelion dist = 2.37903939 AU Mag: H = 11.58, G = 0.15 Epoch of elements : MJD 56222.74700000 TDT (2012 Oct 22.747) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 22 2386 Nikonov 17h 55.8m UT 10.0 1 24 34.699 14 41 21.22TYC 0620-00382-1 10.2 15.0 13 1.2 1.628 -2.352 -5.64 80.6231 14.691 -92.86 -11.38 17.9304 0.03126 -0.18609 -6.32168 -1.04435 0.00066 -0.00032 2000 54.71321920121020.00000310.247178 5.272955 9.0731360.15505931 2.8156289 2.379039411.6 5.00.15 RATE 2.0861280 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.066 0.047 62 5.51 0.050 0 0 5 0 056208.0020121022_0382-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 19:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org