IOTA/IOTA-ES occultation update for (783) Nora / TYC 5779-00265-1 event on 2008 Mar 30, 09:15 UT Visible from Argentina, Chile Summary ------- On 2008 Mar 30 UT, the 40 km diameter asteroid (783) Nora will occult a 10.2 mag star in the constellation Aquarius for observers along a path across Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.6 mag to 14.8 mag (the magnitude of the asteroid) for at most 1.0 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: 66 * date and approx. time of event: 2008 Mar 30, 09:12 - 2008 Mar 30, 09:13 UT * midpoint of event [JD]: 2454555.88545833 * magnitude of target star: 10.2 * magnitude drop [mag]: 4.6 * estimated maximum duration [s]: 1.0 * Moon: 45 % sunlit, 32° distance * Sun: 54° distance * rough path description: Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 41 * 1 sigma uncertainty interval [path widths]: +/- 0.91 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .023", 86° ) * approx speed of asteroid's shadow [km/s]: 40.0891 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5779-00265-1 by 783 Nora on 2008 Mar 30 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 -103 0 0 -23 26 46 9 12 27 1 103 -52 -23 38 4 -23 15 28 -23 58 39 -22 54 55 -102 0 0 -23 39 18 9 12 27 2 102 -51 -23 50 35 -23 28 1 -24 11 9 -23 7 29 -101 0 0 -23 51 35 9 12 27 3 102 -50 -24 2 51 -23 40 18 -24 23 24 -23 19 48 -100 0 0 -24 3 36 9 12 27 3 102 -49 -24 14 52 -23 52 20 -24 35 24 -23 31 51 - 99 0 0 -24 15 22 9 12 27 4 101 -48 -24 26 38 -24 4 7 -24 47 8 -23 43 39 - 98 0 0 -24 26 53 9 12 28 5 101 -47 -24 38 8 -24 15 38 -24 58 37 -23 55 11 - 97 0 0 -24 38 7 9 12 28 6 100 -46 -24 49 22 -24 26 53 -25 9 50 -24 6 28 - 96 0 0 -24 49 6 9 12 28 7 100 -45 -25 0 20 -24 37 53 -25 20 47 -24 17 28 - 95 0 0 -24 59 49 9 12 29 8 99 -45 -25 11 3 -24 48 37 -25 31 29 -24 28 13 - 94 0 0 -25 10 16 9 12 29 9 99 -44 -25 21 29 -24 59 4 -25 41 54 -24 38 42 - 93 0 0 -25 20 27 9 12 29 10 99 -43 -25 31 39 -25 9 15 -25 52 3 -24 48 54 - 92 0 0 -25 30 21 9 12 30 11 98 -42 -25 41 33 -25 19 10 -26 1 56 -24 58 50 - 91 0 0 -25 40 0 9 12 30 12 98 -41 -25 51 10 -25 28 49 -26 11 32 -25 8 30 - 90 0 0 -25 49 21 9 12 31 13 97 -40 -26 0 31 -25 38 11 -26 20 52 -25 17 53 - 89 0 0 -25 58 26 9 12 31 14 97 -39 -26 9 36 -25 47 17 -26 29 56 -25 27 0 - 88 0 0 -26 7 15 9 12 32 15 96 -38 -26 18 24 -25 56 6 -26 38 43 -25 35 50 - 87 0 0 -26 15 46 9 12 33 15 96 -37 -26 26 55 -26 4 38 -26 47 13 -25 44 23 - 86 0 0 -26 24 1 9 12 33 16 96 -36 -26 35 9 -26 12 53 -26 55 26 -25 52 39 - 85 0 0 -26 31 59 9 12 34 17 95 -35 -26 43 7 -26 20 52 -27 3 23 -26 0 38 - 84 0 0 -26 39 40 9 12 35 18 95 -35 -26 50 47 -26 28 33 -27 11 2 -26 8 21 - 83 0 0 -26 47 4 9 12 36 19 94 -34 -26 58 11 -26 35 58 -27 18 25 -26 15 46 - 82 0 0 -26 54 11 9 12 37 20 94 -33 -27 5 18 -26 43 6 -27 25 31 -26 22 55 - 81 0 0 -27 1 1 9 12 38 21 93 -32 -27 12 7 -26 49 56 -27 32 20 -26 29 46 - 80 0 0 -27 7 34 9 12 39 22 93 -31 -27 18 39 -26 56 29 -27 38 51 -26 36 20 - 79 0 0 -27 13 50 9 12 39 23 92 -30 -27 24 54 -27 2 45 -27 45 6 -26 42 37 - 78 0 0 -27 19 48 9 12 40 24 92 -29 -27 30 52 -27 8 44 -27 51 3 -26 48 36 - 77 0 0 -27 25 29 9 12 41 24 91 -28 -27 36 33 -27 14 25 -27 56 43 -26 54 18 - 76 0 0 -27 30 52 9 12 43 25 91 -27 -27 41 56 -27 19 49 -28 2 5 -26 59 43 - 75 0 0 -27 35 59 9 12 44 26 90 -27 -27 47 2 -27 24 56 -28 7 10 -27 4 50 - 74 0 0 -27 40 47 9 12 45 27 90 -26 -27 51 50 -27 29 45 -28 11 58 -27 9 40 - 73 0 0 -27 45 19 9 12 46 28 89 -25 -27 56 21 -27 34 16 -28 16 29 -27 14 12 - 72 0 0 -27 49 33 9 12 47 29 89 -24 -28 0 35 -27 38 31 -28 20 42 -27 18 26 - 71 0 0 -27 53 29 9 12 48 30 88 -23 -28 4 31 -27 42 27 -28 24 37 -27 22 24 - 70 0 0 -27 57 8 9 12 50 31 88 -22 -28 8 10 -27 46 6 -28 28 15 -27 26 3 - 69 0 0 -28 0 29 9 12 51 32 87 -21 -28 11 31 -27 49 28 -28 31 36 -27 29 25 - 68 0 0 -28 3 32 9 12 52 32 87 -20 -28 14 34 -27 52 31 -28 34 39 -27 32 29 - 67 0 0 -28 6 18 9 12 54 33 86 -19 -28 17 20 -27 55 17 -28 37 24 -27 35 16 - 66 0 0 -28 8 47 9 12 55 34 86 -19 -28 19 48 -27 57 46 -28 39 52 -27 37 44 - 65 0 0 -28 10 57 9 12 56 35 85 -18 -28 21 58 -27 59 57 -28 42 2 -27 39 55 - 64 0 0 -28 12 50 9 12 58 36 84 -17 -28 23 51 -28 1 50 -28 43 55 -27 41 49 - 63 0 0 -28 14 26 9 12 59 37 84 -16 -28 25 26 -28 3 25 -28 45 30 -27 43 24 - 62 0 0 -28 15 43 9 13 1 38 83 -15 -28 26 44 -28 4 43 -28 46 47 -27 44 42 - 61 0 0 -28 16 43 9 13 2 39 83 -14 -28 27 43 -28 5 43 -28 47 46 -27 45 42 - 60 0 0 -28 17 25 9 13 4 40 82 -13 -28 28 25 -28 6 25 -28 48 28 -27 46 24 - 59 0 0 -28 17 49 9 13 6 40 82 -12 -28 28 50 -28 6 49 -28 48 53 -27 46 49 - 58 0 0 -28 17 56 9 13 7 41 81 -11 -28 28 56 -28 6 56 -28 48 59 -27 46 56 - 57 0 0 -28 17 45 9 13 9 42 80 -11 -28 28 45 -28 6 45 -28 48 48 -27 46 44 - 56 0 0 -28 17 16 9 13 11 43 80 -10 -28 28 16 -28 6 16 -28 48 19 -27 46 15 - 55 0 0 -28 16 29 9 13 12 44 79 -9 -28 27 29 -28 5 29 -28 47 32 -27 45 28 - 54 0 0 -28 15 25 9 13 14 45 79 -8 -28 26 25 -28 4 24 -28 46 28 -27 44 24 - 53 0 0 -28 14 2 9 13 16 46 78 -7 -28 25 3 -28 3 2 -28 45 6 -27 43 1 - 52 0 0 -28 12 22 9 13 18 47 77 -6 -28 23 23 -28 1 22 -28 43 26 -27 41 21 - 51 0 0 -28 10 24 9 13 20 47 77 -5 -28 21 25 -27 59 24 -28 41 29 -27 39 23 - 50 0 0 -28 8 9 9 13 21 48 76 -4 -28 19 10 -27 57 8 -28 39 14 -27 37 7 - 49 0 0 -28 5 35 9 13 23 49 75 -3 -28 16 37 -27 54 35 -28 36 41 -27 34 33 - 48 0 0 -28 2 44 9 13 25 50 75 -3 -28 13 46 -27 51 43 -28 33 50 -27 31 41 - 47 0 0 -27 59 35 9 13 27 51 74 -2 -28 10 37 -27 48 34 -28 30 42 -27 28 32 - 46 0 0 -27 56 9 9 13 29 52 73 -1 -28 7 11 -27 45 7 -28 27 16 -27 25 4 Uncertainty in time = +/- 1 secs [Prediction of 2008 Feb 14.0] Data for the target star ------------------------ * name: TYC 5779-00265-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 10 32.0883 DE: -11 59 53.930 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .019 ) * V mag [mag]: 10.2 * B mag [mag]: 11.5 * Apparent position with proper motion RA(deg): 317.7454547276 DE(deg): -11.9664435018 * Equation of equinoxes (radians) : 0.000041401121301 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (783) Nora approx. diameter [km]: 40 approx. diameter ["]: .025 distance from Earth [AU]: 2.21300 * orbital information: orbit source: Preston date of fit: 2007 Nov 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 826 number of rejected observations: 64 time covered by the observations: 1911 Aug 28 - 2007 Jun 14 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.012, 84° remarks: * orbital elements for (783) Nora : Mean anomaly = 355.80687926 deg Arg. of pericenter = 154.21824923 deg Long. of node = 142.27413319 deg Inclination = 9.32660117 deg Eccentricity = 0.22901945 Semimajor axis = 2.34317741 AU Perihelion dist = 1.80654420 AU Mag: H = 10.91, G = 0.15 Epoch of elements : MJD 54555.38500000 TDT (2008 Mar 30.385) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 30 783 Nora 9h 15.1m UT 10.2 21 10 32.088-11 59 53.93TYC 5779-00265-1 11.5 14.8 40 1.0 2.213 5.955 21.19 -9.2656 -12.004 42.34 3.98 9.2510 0.04197 -0.16974 21.99038 5.33140 -0.00391 -0.00098 2000 354.3271512008 325.00000154.218249142.274133 9.3266010.22901945 2.3431774 1.806544210.6 5.00.15 RATE 2.7478700 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.023 86 1.91 0.023 0 54510.5020080330_0265-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 15, 00:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org