IOTA/IOTA-ES occultation update for (219) Thusnelda / TYC 0173-02662-1 event on 2008 Jan 10, 19:54 UT Visible from Europe, SW Asia, China, Taiwan Summary ------- On 2008 Jan 10 UT, the 40 km diameter asteroid (219) Thusnelda will occult a 10.4 mag star in the constellation Canis Minor for observers along a path across Europe, SW Asia, China, Taiwan. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.7 mag to 13.0 mag (the magnitude of the asteroid) for at most 3.0 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 75 * date and approx. time of event: 2008 Jan 10, 19:47 - 2008 Jan 10, 20:01 UT * magnitude of target star: 10.4 * magnitude drop [mag]: 2.7 * estimated maximum duration [s]: 3.0 * Moon: 6 % sunlit, 149° distance * Sun: 162° distance * rough path description: Europe, SW Asia, China, Taiwan The occultation path -------------------- * approximate projected width [km]: 46 * 1 sigma uncertainty interval [path widths]: +/- 0.75 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .027", .026", 93° ) * approx speed of asteroid's shadow [km/s]: 13.1642 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0173-02662-1 by 219 Thusnelda on 2008 Jan 10 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 - 31 0 0 39 1 35 20 1 2 1 85 -12 39 14 7 38 49 4 39 32 58 .. .. .. - 30 0 0 39 6 3 20 1 2 1 85 -12 39 18 35 38 53 33 39 37 26 .. .. .. - 29 0 0 39 10 22 20 1 2 2 86 -13 39 22 54 38 57 52 39 41 44 .. .. .. - 28 0 0 39 14 32 20 1 2 3 87 -14 39 27 3 39 2 2 39 45 53 38 43 20 - 27 0 0 39 18 32 20 1 1 4 87 -15 39 31 3 39 6 3 39 49 53 38 47 21 - 26 0 0 39 22 23 20 1 1 5 88 -15 39 34 54 39 9 54 39 53 44 38 51 12 - 25 0 0 39 26 5 20 1 0 5 89 -16 39 38 35 39 13 35 39 57 25 38 54 54 - 24 0 0 39 29 37 20 0 59 6 89 -17 39 42 7 39 17 7 40 0 56 38 58 27 - 23 0 0 39 32 59 20 0 58 7 90 -18 39 45 30 39 20 30 40 4 18 39 1 49 - 22 0 0 39 36 12 20 0 57 8 91 -18 39 48 42 39 23 43 40 7 31 39 5 3 - 21 0 0 39 39 16 20 0 56 8 91 -19 39 51 46 39 26 47 40 10 34 39 8 7 - 20 0 0 39 42 9 20 0 55 9 92 -20 39 54 40 39 29 41 40 13 28 39 11 1 - 19 0 0 39 44 54 20 0 54 10 92 -21 39 57 24 39 32 25 40 16 12 39 13 45 - 18 0 0 39 47 29 20 0 53 11 93 -21 39 59 59 39 35 0 40 18 46 39 16 21 - 17 0 0 39 49 54 20 0 51 11 94 -22 40 2 24 39 37 26 40 21 11 39 18 46 - 16 0 0 39 52 9 20 0 50 12 94 -23 40 4 39 39 39 41 40 23 27 39 21 2 - 15 0 0 39 54 15 20 0 48 13 95 -24 40 6 45 39 41 47 40 25 32 39 23 8 - 14 0 0 39 56 12 20 0 46 14 96 -25 40 8 41 39 43 44 40 27 29 39 25 5 - 13 0 0 39 57 59 20 0 45 14 96 -25 40 10 28 39 45 31 40 29 15 39 26 52 - 12 0 0 39 59 36 20 0 43 15 97 -26 40 12 5 39 47 8 40 30 52 39 28 29 - 11 0 0 40 1 3 20 0 41 16 98 -27 40 13 33 39 48 36 40 32 20 39 29 57 - 10 0 0 40 2 21 20 0 39 17 98 -28 40 14 51 39 49 54 40 33 38 39 31 15 - 9 0 0 40 3 30 20 0 36 17 99 -28 40 15 59 39 51 2 40 34 46 39 32 23 - 8 0 0 40 4 28 20 0 34 18 100 -29 40 16 58 39 52 1 40 35 44 39 33 22 - 7 0 0 40 5 17 20 0 32 19 100 -30 40 17 47 39 52 50 40 36 33 39 34 11 - 6 0 0 40 5 57 20 0 29 20 101 -31 40 18 26 39 53 29 40 37 13 39 34 50 - 5 0 0 40 6 27 20 0 27 20 102 -31 40 18 56 39 53 59 40 37 43 39 35 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21 6 8 19 47 4 5 273 -10 21 18 42 20 53 37 21 37 34 20 34 52 153 0 0 21 0 41 19 47 3 4 273 -10 21 13 14 20 48 9 21 32 6 20 29 25 154 0 0 20 55 24 19 47 3 3 274 -9 21 7 56 20 42 52 21 26 49 .. .. .. 155 0 0 20 50 17 19 47 2 2 274 -8 21 2 49 20 37 46 21 21 41 .. .. .. 156 0 0 20 45 20 19 47 2 1 274 -7 20 57 53 20 32 49 21 16 45 .. .. .. Data for the target star ------------------------ * name: TYC 0173-02662-1 * constellation : Canis Minor * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 26 21.7100 DE: +04 27 18.121 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .021 ) * V mag [mag]: 10.4 * B mag [mag]: 11.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (219) Thusnelda approx. diameter [km]: 40 approx. diameter ["]: .034 distance from Earth [AU]: 1.64100 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 837 number of rejected observations: 109 time covered by the observations: 1913 Dec 19 - 2007 Dec 15 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.014, 97° remarks: * orbital elements for (219) Thusnelda : Mean anomaly = 106.01975694 deg Arg. of pericenter = 142.30241011 deg Long. of node = 200.94656949 deg Inclination = 10.84125251 deg Eccentricity = 0.22320685 Semimajor axis = 2.35443340 AU Perihelion dist = 1.82890774 AU Mag: H = 9.10, G = 0.15 Epoch of elements : MJD 54475.82900000 TDT (2008 Jan 10.829) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 10 219 Thusnelda 19h 54.0m UT 10.4 7 26 21.710 4 27 18.12TYC 0173-02662-1 11.3 13.0 40 3.0 1.641 -2.628 6.33 63.362 4.454 243.36 -21.96 19.9007 .07863 .48974 -7.33609 1.17898 0.00000 0.00178 2000 104.4294952008 1 5.00000142.302410200.946569 10.8412530.223206852.354433401.828907749.325 0.15 RATE 2.7281890 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.027 0.026 93.0 1.750 0.025 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 02, 23:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org