IOTA/IOTA-ES occultation update for (559) Nanon / TYC 6397-01043-1 event on 2009 Sep 09, 22:58 UT Visible from Summary ------- On 2009 Sep 09 UT, the 80 km diameter asteroid (559) Nanon will occult a 12.2 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.4 mag to 13.2 mag (the magnitude of the asteroid) for at most 7.0 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: 79 * date and approx. time of event: 2009 Sep 09, 22:49 - 2009 Sep 09, 23:07 UT * magnitude of target star: 12.2 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 7.0 * Moon: 73 % sunlit, 73° distance * Sun: 166° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 84 * 1 sigma uncertainty interval [path widths]: +/- 0.69 * 1 sigma uncertainty interval [seconds]: +/- 4.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .046 +/- .043) * 1 sigma uncertainty ellipse (major, minor, PA): ( .046", .043", 85° ) * approx speed of asteroid's shadow [km/s]: 11.3329 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6397-01043-1 by 559 Nanon on 2009 Sep 9 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 - 82 0 0 -47 10 31 23 7 22 13 103 -1 -46 46 56 -47 34 9 -46 14 29 -48 6 51 - 81 0 0 -47 23 5 23 7 20 14 103 -1 -46 59 35 -47 46 39 -46 27 12 -48 19 16 - 80 0 0 -47 35 13 23 7 18 15 102 -2 -47 11 46 -47 58 43 -46 39 28 -48 31 14 - 79 0 0 -47 46 53 23 7 16 15 101 -3 -47 23 30 -48 10 20 -46 51 17 -48 42 46 - 78 0 0 -47 58 7 23 7 14 16 100 -3 -47 34 47 -48 21 30 -47 2 40 -48 53 51 - 77 0 0 -48 8 55 23 7 12 17 100 -4 -47 45 38 -48 32 15 -47 13 36 -49 4 31 - 76 0 0 -48 19 17 23 7 10 17 99 -5 -47 56 4 -48 42 33 -47 24 5 -49 14 45 - 75 0 0 -48 29 13 23 7 8 18 98 -5 -48 6 3 -48 52 26 -47 34 9 -49 24 34 - 74 0 0 -48 38 44 23 7 6 19 97 -6 -48 15 37 -49 1 54 -47 43 47 -49 33 57 - 73 0 0 -48 47 49 23 7 4 19 97 -7 -48 24 45 -49 10 57 -47 52 59 -49 42 56 - 72 0 0 -48 56 30 23 7 1 20 96 -7 -48 33 28 -49 19 34 -48 1 46 -49 51 29 - 71 0 0 -49 4 45 23 6 59 21 95 -8 -48 41 46 -49 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6 40 19 92 0 0 8 3 45 22 49 46 8 250 -14 8 28 8 7 39 18 9 1 42 7 5 28 93 0 0 8 28 9 22 49 45 7 250 -13 8 52 28 8 3 47 9 25 56 7 30 4 94 0 0 8 52 0 22 49 44 6 250 -12 9 16 14 8 27 42 9 49 36 7 54 5 95 0 0 9 15 16 22 49 43 5 250 -11 9 39 26 8 51 3 10 12 42 8 17 32 96 0 0 9 37 58 22 49 42 3 250 -10 10 2 3 9 13 49 10 35 13 8 40 24 97 0 0 10 0 4 22 49 41 2 251 -9 10 24 6 9 36 0 10 57 10 9 2 42 98 0 0 10 21 36 22 49 41 1 251 -8 10 45 33 9 57 36 11 18 31 9 24 24 99 0 0 10 42 33 22 49 41 0 251 -7 11 6 26 10 18 37 11 39 18 9 45 31 Uncertainty in time = +/- 5 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 6397-01043-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 57 35.4865 DE: -18 45 08.709 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .039, .040 ) * V mag [mag]: 12.2 * B mag [mag]: 12.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (559) Nanon approx. diameter [km]: 80 approx. diameter ["]: .063 distance from Earth [AU]: 1.74200 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 908 number of rejected observations: 92 time covered by the observations: 1905 Mar 08 - 2008 Feb 13 1 sigma uncertainty ellipse (major, minor, PA): 0.025, 0.016, 74° remarks: * orbital elements for (559) Nanon : Mean anomaly = 91.42867356 deg Arg. of pericenter = 130.90275625 deg Long. of node = 112.19640087 deg Inclination = 9.30697290 deg Eccentricity = 0.06591484 Semimajor axis = 2.71334061 AU Perihelion dist = 2.53449121 AU Mag: H = 9.47, G = 0.15 Epoch of elements : MJD 55083.95700000 TDT (2009 Sep 09.957) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Sep 9 559 Nanon 22h 58.7m UT 12.2 22 57 35.487-18 45 8.71TYC 6397-01043-1 12.5 13.2 80 7.0 1.742 -2.003 -15.24 10.6124 -18.749 -165.38 4.98 22.9776 0.13684 -0.25523 -5.63796 -3.02163 0.00035 0.00132 2000 90.5560772009 9 6.00000130.902756112.196401 9.3069730.06591484 2.7133406 2.5344912 9.4 5.00.15 RATE 2.2051980 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.046 0.043 85 1.69 0.043 0 54545.5020090909_1043-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 13:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org