IOTA/IOTA-ES occultation update for (1403) Idelsonia / TYC 4700-00109-1 event on 2008 Oct 16, 10:36 UT Visible from Florida, Mexico, New Zealand Summary ------- On 2008 Oct 16 UT, the 33 km diameter asteroid (1403) Idelsonia will occult a 11.1 mag star in the constellation Cetus for observers along a path across Florida, Mexico, New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 13.1 mag (the magnitude of the asteroid) for at most 4.4 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: 61 * date and approx. time of event: 2008 Oct 16, 10:23 - 2008 Oct 16, 10:51 UT * magnitude of target star: 11.1 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 4.4 * Moon: 96 % sunlit, 22° distance * Sun: 157° distance * rough path description: Florida, Mexico, New Zealand The occultation path -------------------- * approximate projected width [km]: 34 * 1 sigma uncertainty interval [path widths]: +/- 1.01 * 1 sigma uncertainty interval [seconds]: +/- 5.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .057 +/- .036) * 1 sigma uncertainty ellipse (major, minor, PA): ( .058", .034", 76° ) * approx speed of asteroid's shadow [km/s]: 7.4091 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4700-00109-1 by 1403 Idelsonia on 2008 Oct 16 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 ' " Longitude Longitude Longitude Longitude Latitude Latitude Latitude Latitude - 65 0 0 29 42 32 10 23 38 14 262 -1 29 51 49 29 33 14 30 10 33 29 14 28 - 66 0 0 29 31 46 10 23 42 15 261 -1 29 41 5 29 22 28 29 59 51 29 3 39 - 67 0 0 29 20 23 10 23 45 16 261 -2 29 29 42 29 11 3 29 48 32 28 52 11 - 68 0 0 29 8 20 10 23 49 17 260 -3 29 17 41 28 58 59 29 36 33 28 40 4 - 69 0 0 28 55 38 10 23 53 18 260 -4 29 5 1 28 46 15 29 23 56 28 27 18 - 70 0 0 28 42 18 10 23 57 19 259 -5 28 51 42 28 32 53 29 10 40 28 13 52 - 71 0 0 28 28 18 10 24 2 20 259 -5 28 37 43 28 18 52 28 56 45 27 59 47 - 72 0 0 28 13 38 10 24 7 20 258 -6 28 23 5 28 4 10 28 42 10 27 45 3 - 73 0 0 27 58 19 10 24 12 21 258 -7 28 7 48 27 48 49 28 26 56 27 29 38 - 74 0 0 27 42 19 10 24 17 22 258 -8 27 51 50 27 32 48 28 11 2 27 13 33 - 75 0 0 27 25 40 10 24 22 23 257 -9 27 35 12 27 16 6 27 54 28 26 56 48 - 76 0 0 27 8 19 10 24 28 24 257 -10 27 17 54 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-55 11 44 135 0 0 -54 48 31 10 51 8 6 82 -10 -54 39 21 -54 57 42 -54 20 49 -55 16 16 134 0 0 -54 52 41 10 51 9 5 82 -9 -54 43 31 -55 1 51 -54 25 1 -55 20 23 133 0 0 -54 56 25 10 51 9 5 83 -9 -54 47 16 -55 5 34 -54 28 48 -55 24 5 132 0 0 -54 59 43 10 51 10 4 84 -8 -54 50 35 -55 8 52 -54 32 8 -55 27 21 131 0 0 -55 2 37 10 51 11 4 85 -8 -54 53 29 -55 11 45 -54 35 3 -55 30 13 130 0 0 -55 5 5 10 51 11 3 86 -7 -54 55 58 -55 14 12 -54 37 33 -55 32 39 129 0 0 -55 7 8 10 51 12 3 86 -7 -54 58 1 -55 16 15 -54 39 37 -55 34 41 128 0 0 -55 8 45 10 51 12 2 87 -6 -54 59 39 -55 17 52 -54 41 16 -55 36 17 127 0 0 -55 9 58 10 51 12 1 88 -5 -55 0 52 -55 19 5 -54 42 30 -55 37 29 126 0 0 -55 10 46 10 51 12 1 89 -5 -55 1 40 -55 19 52 -54 43 18 -55 38 16 125 0 0 -55 11 8 10 51 13 0 90 -4 -55 2 3 -55 20 14 -54 43 41 -55 38 38 Uncertainty in time = +/- 6 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: TYC 4700-00109-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 50 16.2137 DE: -00 04 50.644 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .024 ) * V mag [mag]: 11.1 * B mag [mag]: 11.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1403) Idelsonia approx. diameter [km]: 33 approx. diameter ["]: .041 distance from Earth [AU]: 1.10100 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 759 number of rejected observations: 18 time covered by the observations: 1936 Aug 17 - 2008 Sep 17 1 sigma uncertainty ellipse (major, minor, PA): 0.055, 0.025, 74° remarks: * orbital elements for (1403) Idelsonia : Mean anomaly = 23.81503407 deg Arg. of pericenter = 191.91547181 deg Long. of node = 157.13146456 deg Inclination = 10.14618557 deg Eccentricity = 0.29041755 Semimajor axis = 2.71982432 AU Perihelion dist = 1.92993961 AU Mag: H = 11.48, G = 0.15 Epoch of elements : MJD 54755.44200000 TDT (2008 Oct 16.442) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 16 1403 Idelsonia 10h 37.2m UT 11.1 2 50 16.214- 0 4 50.64TYC 4700-00109-1 11.5 13.1 33 4.4 1.101 -1.630 -22.77 -142.0550 -0.075 17.07 -9.10 10.6201 0.14191 -0.15195 -3.05924 -2.85121 -0.00190 0.00084 2000 22.61925420081011.00000191.915472157.131465 10.1461860.29041755 2.7198243 1.929939610.6 5.00.15 RATE 2.1973170 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.058 0.034 76 2.01 0.042 0 54740.5020081016_0109-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 05:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org