IOTA/IOTA-ES occultation update for (2835) Ryoma / TYC 6815-04711-2 event on 2008 Jul 07, 12:35 UT Visible from New zealanda, Tasmania Summary ------- On 2008 Jul 07 UT, the 26 km diameter asteroid (2835) Ryoma will occult a 11.3 mag star in the constellation Ophiuchus for observers along a path across New zealanda, Tasmania. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.8 mag to 16.1 mag (the magnitude of the asteroid) for at most 3.1 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: 26 * date and approx. time of event: 2008 Jul 07, 12:23 - 2008 Jul 07, 12:46 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 4.8 * estimated maximum duration [s]: 3.1 * Moon: 24 % sunlit, 94° distance * Sun: 153° distance * rough path description: New zealanda, Tasmania The occultation path -------------------- * approximate projected width [km]: 27 * 1 sigma uncertainty interval [path widths]: +/- 2.61 * 1 sigma uncertainty interval [seconds]: +/- 11.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .085 +/- .052) * 1 sigma uncertainty ellipse (major, minor, PA): ( .085", .052", 94° ) * approx speed of asteroid's shadow [km/s]: 8.4392 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6815-04711-2 by 2835 Ryoma on 2008 Jul 7 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 72 0 0 -19 30 10 12 46 6 27 109 -1 -19 22 5 -19 38 15 -18 39 59 -20 20 34 73 0 0 -19 57 59 12 46 0 28 108 -2 -19 49 54 -20 6 4 -19 7 49 -20 48 21 74 0 0 -20 25 37 12 45 53 29 108 -3 -20 17 32 -20 33 41 -19 35 29 -21 15 57 75 0 0 -20 53 4 12 45 46 30 108 -4 -20 45 0 -21 1 8 -20 2 58 -21 43 22 76 0 0 -21 20 20 12 45 39 31 107 -5 -21 12 16 -21 28 24 -20 30 16 -22 10 35 77 0 0 -21 47 23 12 45 32 32 107 -6 -21 39 20 -21 55 27 -20 57 22 -22 37 37 78 0 0 -22 14 14 12 45 24 33 106 -7 -22 6 11 -22 22 17 -21 24 16 -23 4 25 79 0 0 -22 40 52 12 45 17 34 106 -8 -22 32 50 -22 48 55 -21 50 56 -23 31 0 80 0 0 -23 7 16 12 45 9 35 105 -9 -22 59 14 -23 15 19 -22 17 23 -23 57 21 81 0 0 -23 33 26 12 45 1 36 105 -10 -23 25 25 -23 41 28 -22 43 36 -24 23 29 82 0 0 -23 59 22 12 44 53 37 104 -11 -23 51 21 -24 7 23 -23 9 35 -24 49 21 83 0 0 -24 25 3 12 44 45 38 104 -12 -24 17 2 -24 33 3 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14 -27 45 7 -26 47 50 -28 26 42 -131 0 0 -27 13 9 12 23 47 17 250 -41 -27 5 11 -27 21 6 -26 23 44 -28 2 45 -130 0 0 -26 48 48 12 23 43 16 250 -40 -26 40 50 -26 56 46 -25 59 19 -27 38 29 -129 0 0 -26 24 8 12 23 40 15 249 -40 -26 16 10 -26 32 8 -25 34 35 -27 13 54 -128 0 0 -25 59 10 12 23 36 14 249 -39 -25 51 11 -26 7 10 -25 9 32 -26 49 0 -127 0 0 -25 33 54 12 23 33 13 248 -38 -25 25 54 -25 41 55 -24 44 11 -26 23 48 -126 0 0 -25 8 20 12 23 30 12 248 -37 -25 0 19 -25 16 21 -24 18 33 -25 58 18 -125 0 0 -24 42 28 12 23 28 11 247 -36 -24 34 27 -24 50 30 -23 52 37 -25 32 31 -124 0 0 -24 16 19 12 23 25 10 247 -35 -24 8 17 -24 24 22 -23 26 25 -25 6 26 -123 0 0 -23 49 54 12 23 23 9 247 -34 -23 41 51 -23 57 57 -22 59 56 -24 40 5 -122 0 0 -23 23 13 12 23 21 8 246 -33 -23 15 9 -23 31 17 -22 33 11 -24 13 27 -121 0 0 -22 56 16 12 23 19 7 246 -32 -22 48 12 -23 4 20 -22 6 10 -23 46 33 -120 0 0 -22 29 4 12 23 18 6 245 -31 -22 20 59 -22 37 8 -21 38 55 -23 19 25 -119 0 0 -22 1 37 12 23 16 5 245 -30 -21 53 32 -22 9 42 -21 11 25 -22 52 1 -118 0 0 -21 33 56 12 23 15 4 245 -29 -21 25 50 -21 42 2 -20 43 41 -22 24 23 -117 0 0 -21 6 1 12 23 15 3 244 -28 -20 57 55 -21 14 8 -20 15 43 -21 56 31 -116 0 0 -20 37 54 12 23 14 2 244 -27 -20 29 47 -20 46 1 .. .. .. -21 28 26 -115 0 0 -20 9 34 12 23 14 1 244 -26 -20 1 27 -20 17 41 .. .. .. -21 0 9 Uncertainty in time = +/- 13 secs [Prediction of 2008 Jul 2.0] Data for the target star ------------------------ * name: TYC 6815-04711-2 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 09 42.7806 DE: -24 58 54.041 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .053, .022 ) * V mag [mag]: 11.3 * B mag [mag]: 11.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2835) Ryoma approx. diameter [km]: 26 approx. diameter ["]: .020 distance from Earth [AU]: 1.76300 * orbital information: orbit source: Preston date of fit: 2008 Jul 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 938 number of rejected observations: 20 time covered by the observations: 1932 Dec 17 - 2008 Jun 08 1 sigma uncertainty ellipse (major, minor, PA): 0.066, 0.047, 96° remarks: * orbital elements for (2835) Ryoma : Mean anomaly = 284.55373389 deg Arg. of pericenter = 347.80456113 deg Long. of node = 5.38395251 deg Inclination = 1.33619344 deg Eccentricity = 0.08202581 Semimajor axis = 2.74665943 AU Perihelion dist = 2.52136247 AU Mag: H = 11.96, G = 0.15 Epoch of elements : MJD 54654.52400000 TDT (2008 Jul 07.524) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 7 2835 Ryoma 12h 35.4m UT 11.3 17 9 42.781-24 58 54.04TYC 6815-04711-2 11.6 16.1 26 3.1 1.763 -1.734 2.88 142.7271 -24.983 -7.60 22.51 12.5900 -0.03188 -0.25575 -4.72810 0.57813 0.00255 -0.00004 2000 283.5742002008 7 3.00000347.804561 5.383953 1.3361930.08202581 2.7466594 2.521362512.1 5.00.15 RATE 2.1651940 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.085 0.052 94 3.61 0.053 0 54649.5020080707_4711-2 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jul 02, 19:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org