IOTA/IOTA-ES occultation update for (219) Thusnelda / TYC 5536-00478-1 event on 2009 Apr 04, 21:21 UT Visible from Summary ------- On 2009 Apr 04 UT, the 40 km diameter asteroid (219) Thusnelda will occult a 10.9 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 12.9 mag (the magnitude of the asteroid) for at most 2.8 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: 67 * date and approx. time of event: 2009 Apr 04, 21:17 - 2009 Apr 04, 21:26 UT * magnitude of target star: 10.9 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 2.8 * Moon: 75 % sunlit, 62° distance * Sun: 178° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 65 * 1 sigma uncertainty interval [path widths]: +/- 0.88 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .024", 93° ) * approx speed of asteroid's shadow [km/s]: 14.1496 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5536-00478-1 by 219 Thusnelda on 2009 Apr 4 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 18 46 33 81 0 0 21 26 19 1 159 -2 20 46 35 16 45 48 24 16 31 ... .. .. 21 7 2 80 0 0 21 26 19 2 161 -4 22 54 38 19 19 0 26 3 15 ... .. .. Latitude Latitude Latitude Latitude 22 0 0 79 34 55 21 26 19 2 162 -4 80 26 40 78 45 53 .. .. .. 77 24 59 23 0 0 79 4 46 21 26 18 3 163 -5 79 57 18 78 15 4 81 38 24 76 53 14 24 0 0 78 32 43 21 26 18 3 164 -5 79 25 55 77 42 27 81 8 36 76 19 48 25 0 0 77 58 41 21 26 18 4 165 -6 78 52 27 77 7 57 80 36 29 75 44 37 26 0 0 77 22 39 21 26 17 4 166 -6 78 16 52 76 31 32 80 1 57 75 7 41 27 0 0 76 44 34 21 26 16 5 167 -7 77 39 5 75 53 12 79 24 55 74 28 59 28 0 0 76 4 26 21 26 15 6 168 -8 76 59 7 75 12 55 78 45 21 73 48 31 29 0 0 75 22 15 21 26 14 6 169 -8 76 16 57 74 30 43 78 3 15 73 6 18 30 0 0 74 38 3 21 26 13 7 170 -9 75 32 38 73 46 38 77 18 38 72 22 22 31 0 0 73 51 52 21 26 12 8 171 -10 74 46 11 73 0 41 76 31 34 71 36 45 32 0 0 73 3 48 21 26 10 9 172 -11 73 57 42 72 12 57 75 42 8 70 49 31 33 0 0 72 13 54 21 26 8 10 173 -12 73 7 16 71 23 30 74 50 28 70 0 43 34 0 0 71 22 17 21 26 6 11 174 -13 72 15 0 70 32 26 73 56 41 69 10 27 35 0 0 70 29 4 21 26 4 12 175 -14 71 21 2 69 39 51 73 0 59 68 18 48 36 0 0 69 34 21 21 26 2 13 176 -14 70 25 29 68 45 52 72 3 32 67 25 51 37 0 0 68 38 18 21 25 59 13 177 -15 69 28 31 67 50 35 71 4 31 66 31 42 38 0 0 67 41 1 21 25 56 14 178 -16 68 30 17 66 54 8 70 4 7 65 36 29 39 0 0 66 42 40 21 25 52 15 179 -17 67 30 55 65 56 39 69 2 31 64 40 17 40 0 0 65 43 22 21 25 48 16 180 -18 66 30 35 64 58 15 67 59 55 63 43 13 41 0 0 64 43 15 21 25 44 17 181 -19 65 29 25 63 59 4 66 56 28 62 45 25 42 0 0 63 42 28 21 25 40 18 182 -20 64 27 35 62 59 13 65 52 20 61 46 58 43 0 0 62 41 9 21 25 35 19 183 -21 63 25 11 61 58 50 64 47 41 60 47 59 44 0 0 61 39 23 21 25 31 20 184 -22 62 22 23 60 58 0 63 42 40 59 48 35 45 0 0 60 37 19 21 25 25 21 185 -23 61 19 17 59 56 51 62 37 24 58 48 51 46 0 0 59 35 2 21 25 20 22 186 -24 60 16 0 58 55 30 61 32 1 57 48 54 47 0 0 58 32 40 21 25 14 23 187 -25 59 12 38 57 54 1 60 26 37 56 48 48 48 0 0 57 30 17 21 25 8 24 188 -26 58 9 17 56 52 31 59 21 19 55 48 39 49 0 0 56 28 0 21 25 2 25 190 -27 57 6 4 55 51 4 58 16 12 54 48 32 50 0 0 55 25 52 21 24 56 26 191 -28 56 3 2 54 49 46 57 11 21 53 48 32 51 0 0 54 23 59 21 24 49 27 192 -29 55 0 17 53 48 41 56 6 51 52 48 43 52 0 0 53 22 25 21 24 42 28 193 -30 53 57 52 52 47 54 55 2 46 51 49 9 53 0 0 52 21 14 21 24 35 29 194 -31 52 55 52 51 47 27 53 59 10 50 49 54 54 0 0 51 20 28 21 24 27 30 196 -31 51 54 20 50 47 25 52 56 6 49 51 2 55 0 0 50 20 13 21 24 20 30 197 -32 50 53 20 49 47 51 51 53 38 48 52 35 56 0 0 49 20 30 21 24 12 31 198 -33 49 52 54 48 48 48 50 51 48 47 54 37 57 0 0 48 21 22 21 24 4 32 199 -34 48 53 5 47 50 19 49 50 39 46 57 10 58 0 0 47 22 52 21 23 56 33 201 -34 47 53 55 46 52 27 48 50 13 46 0 18 59 0 0 46 25 2 21 23 48 33 202 -35 46 55 28 45 55 13 47 50 33 45 4 2 60 0 0 45 27 55 21 23 40 34 203 -36 45 57 44 44 58 39 46 51 39 44 8 24 61 0 0 44 31 31 21 23 32 35 205 -36 45 0 45 44 2 49 45 53 35 43 13 28 62 0 0 43 35 54 21 23 23 35 206 -37 44 4 34 43 7 42 44 56 20 42 19 13 63 0 0 42 41 3 21 23 15 36 207 -37 43 9 12 42 13 22 43 59 58 41 25 43 64 0 0 41 47 2 21 23 6 36 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Uncertainty in time = +/- 3 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 5536-00478-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 59 06.1601 DE: -07 53 13.134 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .021 ) * V mag [mag]: 10.9 * B mag [mag]: 11.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (219) Thusnelda approx. diameter [km]: 40 approx. diameter ["]: .031 distance from Earth [AU]: 1.75400 * orbital information: orbit source: Preston date of fit: 2008 Mar 19 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 856 number of rejected observations: 109 time covered by the observations: 1913 Dec 19 - 2008 Feb 10 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.013, 103° remarks: * orbital elements for (219) Thusnelda : Mean anomaly = 228.78417671 deg Arg. of pericenter = 142.34148313 deg Long. of node = 200.93087002 deg Inclination = 10.84396225 deg Eccentricity = 0.22355183 Semimajor axis = 2.35381157 AU Perihelion dist = 1.82761270 AU Mag: H = 9.10, G = 0.15 Epoch of elements : MJD 54925.89000000 TDT (2009 Apr 04.890) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Apr 4 219 Thusnelda 21h 21.7m UT 10.9 12 59 6.160- 7 53 13.13TYC 5536-00478-1 11.3 12.9 40 2.8 1.754 -2.213 22.84 41.0275 -7.892 -139.71 6.00 21.3617 0.44776 0.64462 -6.55954 4.55586 -0.00006 0.00018 2000 227.1766372009 330.00000142.341483200.930870 10.8439620.22355183 2.3538116 1.8276127 9.3 5.00.15 RATE 2.7292700 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.024 93 1.88 0.028 0 54545.5020090404_0478-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 06:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org