IOTA/IOTA-ES occultation update for (1356) Nyanza / UCAC2 42398194 event on 2009 Feb 03, 18:39 UT Visible from Summary ------- On 2009 Feb 03 UT, the 65 km diameter asteroid (1356) Nyanza will occult a 12.0 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.8 mag to 14.7 mag (the magnitude of the asteroid) for at most 6.6 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: 42 * date and approx. time of event: 2009 Feb 03, 18:28 - 2009 Feb 03, 18:48 UT * magnitude of target star: 12.0 * magnitude drop [mag]: 2.8 * estimated maximum duration [s]: 6.6 * Moon: 59 % sunlit, 49° distance * Sun: 149° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 66 * 1 sigma uncertainty interval [path widths]: +/- 1.56 * 1 sigma uncertainty interval [seconds]: +/- 8.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .061 +/- .062) * 1 sigma uncertainty ellipse (major, minor, PA): ( .062", .061", 0° ) * approx speed of asteroid's shadow [km/s]: 9.8132 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 42398194 by 1356 Nyanza on 2009 Feb 3 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 - 12 0 0 11 12 52 18 48 41 28 61 0 11 32 19 10 53 24 12 32 52 9 52 30 - 11 0 0 11 37 55 18 48 35 29 62 -1 11 57 18 11 18 30 12 57 42 10 17 46 - 10 0 0 12 2 29 18 48 29 30 62 -2 12 21 49 11 43 7 13 22 2 10 42 34 - 9 0 0 12 26 33 18 48 23 31 62 -3 12 45 50 12 7 14 13 45 53 11 6 52 - 8 0 0 12 50 8 18 48 17 32 62 -4 13 9 22 12 30 53 14 9 15 11 30 40 - 7 0 0 13 13 13 18 48 11 33 62 -5 13 32 24 12 54 1 14 32 7 11 53 58 - 6 0 0 13 35 49 18 48 4 35 62 -6 13 54 56 13 16 40 14 54 30 12 16 47 - 5 0 0 13 57 54 18 47 57 36 62 -7 14 16 59 13 38 49 15 16 23 12 39 6 - 4 0 0 14 19 30 18 47 51 37 63 -8 14 38 32 14 0 28 15 37 46 13 0 54 - 3 0 0 14 40 36 18 47 44 38 63 -9 14 59 35 14 21 37 15 58 40 13 22 13 - 2 0 0 15 1 12 18 47 37 38 63 -10 15 20 8 14 42 15 16 19 4 13 43 1 - 1 0 0 15 21 18 18 47 29 39 63 -11 15 40 11 15 2 24 16 38 58 14 3 19 0 0 0 15 40 54 18 47 22 40 63 -12 15 59 44 15 22 3 16 58 22 14 23 7 1 0 0 16 0 0 18 47 15 41 63 -13 16 18 47 15 41 12 17 17 16 14 42 25 2 0 0 16 18 36 18 47 7 42 63 -14 16 37 20 15 59 51 17 35 41 15 1 12 3 0 0 16 36 42 18 47 0 43 64 -15 16 55 23 16 17 59 17 53 35 15 19 29 4 0 0 16 54 18 18 46 52 44 64 -16 17 12 56 16 35 38 18 11 0 15 37 16 5 0 0 17 11 23 18 46 44 45 64 -17 17 30 0 16 52 46 18 27 55 15 54 33 6 0 0 17 27 59 18 46 36 46 64 -18 17 46 33 17 9 25 18 44 21 16 11 19 7 0 0 17 44 5 18 46 28 47 64 -19 18 2 36 17 25 33 19 0 17 16 27 36 8 0 0 17 59 42 18 46 20 48 64 -20 18 18 10 17 41 12 19 15 43 16 43 22 9 0 0 18 14 48 18 46 12 49 64 -21 18 33 14 17 56 20 19 30 40 16 58 38 10 0 0 18 29 25 18 46 3 50 64 -22 18 47 49 18 10 59 19 45 7 17 13 24 11 0 0 18 43 31 18 45 55 51 64 -23 19 1 53 18 25 9 19 59 5 17 27 41 12 0 0 18 57 9 18 45 47 52 65 -24 19 15 28 18 38 48 20 12 33 17 41 27 13 0 0 19 10 17 18 45 38 53 65 -25 19 28 34 18 51 58 20 25 33 17 54 43 14 0 0 19 22 55 18 45 29 54 65 -26 19 41 10 19 4 38 20 38 3 18 7 30 15 0 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Uncertainty in time = +/- 10 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: UCAC2 42398194 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 10 29.7140 DE: +30 20 45.079 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .052, .059 ) * V mag [mag]: 12.0 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1356) Nyanza approx. diameter [km]: 65 approx. diameter ["]: .040 distance from Earth [AU]: 2.22800 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 873 number of rejected observations: 42 time covered by the observations: 1931 Oct 10 - 2008 Feb 06 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.020, 90° remarks: * orbital elements for (1356) Nyanza : Mean anomaly = 101.09122729 deg Arg. of pericenter = 298.65888755 deg Long. of node = 69.87593074 deg Inclination = 7.95877454 deg Eccentricity = 0.04492385 Semimajor axis = 3.08481853 AU Perihelion dist = 2.94623660 AU Mag: H = 10.10, G = 0.15 Epoch of elements : MJD 54865.77700000 TDT (2009 Feb 03.777) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 3 1356 Nyanza 18h 39.3m UT 12.0 7 10 29.714 30 20 45.08UCAC2 42398194 0.0 14.7 65 6.6 2.228 -1.676 2.60 53.7221 30.345 -96.36 -16.31 18.6553 -0.01952 -0.15708 -5.49941 0.65983 0.00289 -0.00107 2000 100.0403262009 129.00000298.658888 69.875931 7.9587750.04492385 3.0848185 2.9462366 9.9 5.00.15 RATE 1.8191120 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.062 0.061 0 2.56 0.063 0 54776.5020090203_398194 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 05:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org