IOTA/IOTA-ES occultation update for (43) Ariadne / TYC 6310-02345-1 event on 2008 Mar 01, 01:49 UT Visible from Africa Summary ------- On 2008 Mar 01 UT, the 66 km diameter asteroid (43) Ariadne will occult a 11.2 mag star in the constellation Sagittarius for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.4 mag to 12.3 mag (the magnitude of the asteroid) for at most 1.6 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: 84 * date and approx. time of event: 2008 Mar 01, 01:46 - 2008 Mar 01, 01:47 UT * magnitude of target star: 11.2 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 1.6 * Moon: 40 % sunlit, 30° distance * Sun: 49° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 66 * 1 sigma uncertainty interval [path widths]: +/- 0.61 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .025 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .025", .024", 88° ) * approx speed of asteroid's shadow [km/s]: 41.8942 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6310-02345-1 by 43 Ariadne on 2008 Mar 1 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 13 0 0 -13 58 47 1 46 34 1 112 -48 -14 18 9 -13 39 26 -14 41 46 -13 15 50 14 0 0 -14 22 25 1 46 34 2 112 -47 -14 41 45 -14 3 5 -15 5 21 -13 39 31 15 0 0 -14 45 47 1 46 34 3 111 -46 -15 5 6 -14 26 29 -15 28 40 -14 2 57 16 0 0 -15 8 54 1 46 35 4 111 -45 -15 28 11 -14 49 38 -15 51 43 -14 26 7 17 0 0 -15 31 45 1 46 35 5 111 -44 -15 51 0 -15 12 30 -16 14 31 -14 49 2 18 0 0 -15 54 19 1 46 35 6 111 -43 -16 13 33 -15 35 6 -16 37 1 -15 11 40 19 0 0 -16 16 37 1 46 35 7 110 -42 -16 35 49 -15 57 25 -16 59 15 -15 34 1 20 0 0 -16 38 37 1 46 36 8 110 -41 -16 57 47 -16 19 27 -17 21 12 -15 56 5 21 0 0 -17 0 20 1 46 36 9 110 -40 -17 19 28 -16 41 11 -17 42 50 -16 17 51 22 0 0 -17 21 44 1 46 37 10 110 -39 -17 40 51 -17 2 38 -18 4 11 -16 39 19 23 0 0 -17 42 50 1 46 37 11 109 -38 -18 1 55 -17 23 45 -18 25 13 -17 0 29 24 0 0 -18 3 38 1 46 38 12 109 -37 -18 22 41 -17 44 35 -18 45 57 -17 21 21 25 0 0 -18 24 6 1 46 38 13 109 -36 -18 43 8 -18 5 5 -19 6 21 -17 41 53 26 0 0 -18 44 15 1 46 39 14 108 -35 -19 3 15 -18 25 16 -19 26 26 -18 2 6 27 0 0 -19 4 5 1 46 40 15 108 -34 -19 23 3 -18 45 8 -19 46 12 -18 22 0 28 0 0 -19 23 35 1 46 40 16 108 -33 -19 42 31 -19 4 39 -20 5 38 -18 41 34 29 0 0 -19 42 45 1 46 41 17 107 -32 -20 1 39 -19 23 51 -20 24 43 -19 0 48 30 0 0 -20 1 34 1 46 42 18 107 -31 -20 20 26 -19 42 42 -20 43 29 -19 19 41 31 0 0 -20 20 3 1 46 43 19 107 -30 -20 38 53 -20 1 13 -21 1 53 -19 38 14 32 0 0 -20 38 11 1 46 44 20 106 -29 -20 57 0 -20 19 23 -21 19 57 -19 56 26 33 0 0 -20 55 58 1 46 45 21 106 -28 -21 14 45 -20 37 11 -21 37 40 -20 14 18 34 0 0 -21 13 24 1 46 46 22 106 -27 -21 32 9 -20 54 39 -21 55 2 -20 31 48 35 0 0 -21 30 28 1 46 47 23 105 -26 -21 49 11 -21 11 46 -22 12 2 -20 48 56 36 0 0 -21 47 11 1 46 48 24 105 -25 -22 5 53 -21 28 30 -22 28 41 -21 5 43 37 0 0 -22 3 33 1 46 49 25 104 -24 -22 22 12 -21 44 54 -22 44 59 -21 22 9 38 0 0 -22 19 32 1 46 50 26 104 -23 -22 38 10 -22 0 55 -23 0 54 -21 38 12 39 0 0 -22 35 10 1 46 51 27 104 -22 -22 53 46 -22 16 34 -23 16 28 -21 53 54 40 0 0 -22 50 25 1 46 52 28 103 -21 -23 8 59 -22 31 51 -23 31 39 -22 9 13 41 0 0 -23 5 18 1 46 54 29 103 -20 -23 23 51 -22 46 46 -23 46 28 -22 24 10 42 0 0 -23 19 49 1 46 55 30 102 -19 -23 38 20 -23 1 19 -24 0 55 -22 38 45 43 0 0 -23 33 58 1 46 56 31 102 -18 -23 52 27 -23 15 29 -24 15 0 -22 52 57 44 0 0 -23 47 44 1 46 57 32 102 -17 -24 6 11 -23 29 17 -24 28 42 -23 6 47 45 0 0 -24 1 7 1 46 59 33 101 -16 -24 19 33 -23 42 42 -24 42 2 -23 20 14 46 0 0 -24 14 8 1 47 0 34 101 -15 -24 32 32 -23 55 44 -24 54 59 -23 33 18 47 0 0 -24 26 46 1 47 2 35 100 -14 -24 45 8 -24 8 24 -25 7 33 -23 46 0 48 0 0 -24 39 1 1 47 3 36 100 -13 -24 57 22 -24 20 41 -25 19 45 -23 58 19 49 0 0 -24 50 53 1 47 4 37 99 -12 -25 9 13 -24 32 34 -25 31 34 -24 10 14 50 0 0 -25 2 23 1 47 6 38 99 -11 -25 20 40 -24 44 5 -25 43 0 -24 21 47 51 0 0 -25 13 29 1 47 8 39 98 -10 -25 31 45 -24 55 13 -25 54 3 -24 32 57 52 0 0 -25 24 13 1 47 9 39 98 -10 -25 42 27 -25 5 58 -26 4 43 -24 43 43 53 0 0 -25 34 33 1 47 11 40 97 -9 -25 52 46 -25 16 20 -26 15 1 -24 54 7 54 0 0 -25 44 30 1 47 12 41 97 -8 -26 2 42 -25 26 18 -26 24 55 -25 4 7 55 0 0 -25 54 4 1 47 14 42 97 -7 -26 12 15 -25 35 54 -26 34 26 -25 13 44 56 0 0 -26 3 15 1 47 16 43 96 -6 -26 21 25 -25 45 6 -26 43 35 -25 22 58 57 0 0 -26 12 3 1 47 17 44 96 -5 -26 30 12 -25 53 55 -26 52 20 -25 31 49 58 0 0 -26 20 28 1 47 19 45 95 -4 -26 38 35 -26 2 21 -27 0 42 -25 40 16 59 0 0 -26 28 30 1 47 21 46 95 -3 -26 46 36 -26 10 24 -27 8 41 -25 48 20 60 0 0 -26 36 8 1 47 22 47 94 -2 -26 54 13 -26 18 3 -27 16 17 -25 56 1 61 0 0 -26 43 23 1 47 24 48 94 -1 -27 1 27 -26 25 20 -27 23 30 -26 3 18 62 0 0 -26 50 15 1 47 26 49 93 0 -27 8 18 -26 32 12 -27 30 19 -26 10 12 Uncertainty in time = +/- 1 secs [Prediction of 2008 Feb 14.0] Data for the target star ------------------------ * name: TYC 6310-02345-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 32 54.8611 DE: -21 36 03.906 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .023 ) * V mag [mag]: 11.2 * B mag [mag]: 11.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (43) Ariadne approx. diameter [km]: 66 approx. diameter ["]: .039 distance from Earth [AU]: 2.32700 * orbital information: orbit source: Preston date of fit: 2007 Nov 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 987 number of rejected observations: 158 time covered by the observations: 1904 Nov 17 - 2007 May 21 1 sigma uncertainty ellipse (major, minor, PA): 0.011, 0.005, 77° remarks: * orbital elements for (43) Ariadne : Mean anomaly = 350.57512201 deg Arg. of pericenter = 15.91160231 deg Long. of node = 264.93435649 deg Inclination = 3.46796511 deg Eccentricity = 0.16827139 Semimajor axis = 2.20355889 AU Perihelion dist = 1.83276297 AU Mag: H = 7.78, G = 0.11 Epoch of elements : MJD 54526.07600000 TDT (2008 Mar 01.076) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 1 43 Ariadne 1h 49.1m UT 11.2 19 32 54.861-21 36 3.91TYC 6310-02345-1 11.7 12.3 66 1.6 2.327 6.289 17.09 106.7070 -21.606 155.82 -7.49 1.8184 0.01225 -0.06013 23.21023 4.52011 -0.00386 -0.00060 2000 348.7443482008 224.00000 15.911602264.934356 3.4679650.16827139 2.2035589 1.8327630 7.9 5.00.11 RATE 3.0131240 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.025 0.024 88 1.61 0.024 0 54510.5020080301_2345-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 14, 02:26 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org