IOTA/IOTA-ES occultation update for (219) Thusnelda / TYC 0186-02560-1 event on 2008 Jan 07, 00:59 UT Visible from Russia, Scandanavia Summary ------- On 2008 Jan 07 UT, the 40 km diameter asteroid (219) Thusnelda will occult a 11.5 mag star in the constellation Canis Minor for observers along a path across Russia, Scandanavia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 13.0 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, 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: 78 * date and approx. time of event: 2008 Jan 07, 00:56 - 2008 Jan 07, 01:03 UT * magnitude of target star: 11.5 * magnitude drop [mag]: 1.7 * estimated maximum duration [s]: 3.1 * Moon: 2 % sunlit, 147° distance * Sun: 161° distance * rough path description: Russia, Scandanavia The occultation path -------------------- * approximate projected width [km]: 97 * 1 sigma uncertainty interval [path widths]: +/- 0.71 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .027", .024", 93° ) * approx speed of asteroid's shadow [km/s]: 13.0269 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0186-02560-1 by 219 Thusnelda on 2008 Jan 07 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude ... .. .. .. .. .. .. .. .. .. .. .. ... .. .. .. .. .. ... .. .. .. .. .. 84 8 14 58 36 0 ... .. .. .. .. .. ... .. .. .. .. .. .. .. .. .. .. .. 83 37 9 59 16 4 ... .. .. .. .. .. 77 56 18 59 11 57 ... .. .. .. .. .. 81 18 14 59 55 58 0 56 51 4 271 -17 77 42 19 59 50 51 ... .. .. .. .. .. 73 57 57 59 37 36 ... .. .. .. .. .. 76 21 24 60 26 24 0 56 56 7 267 -20 73 47 0 60 16 25 79 34 42 60 33 36 70 45 18 59 59 41 ... .. .. .. .. .. 72 42 58 60 50 45 0 57 1 8 264 -22 70 35 21 60 38 33 75 10 45 61 1 37 67 57 53 60 19 45 79 41 24 61 12 43 69 39 50 61 12 20 0 57 7 10 261 -23 67 48 10 60 58 45 71 44 52 61 25 6 65 26 56 60 38 29 75 15 48 61 41 2 66 57 48 61 32 12 0 57 12 11 258 -24 65 17 5 61 17 38 68 48 31 61 46 14 63 7 43 60 56 16 71 48 31 62 4 47 64 30 8 61 50 55 0 57 17 12 256 -26 62 57 32 61 35 34 66 10 43 62 5 52 60 57 22 61 13 18 68 50 53 62 26 12 62 12 55 62 8 45 0 57 22 13 254 -27 60 46 41 61 52 46 63 45 52 62 24 27 58 53 58 61 29 44 66 11 53 62 46 6 60 3 45 62 25 55 0 57 27 14 252 -28 58 42 41 62 9 23 61 30 37 62 42 14 56 56 9 61 45 41 63 45 51 63 4 57 58 0 56 62 42 31 0 57 32 15 250 -28 56 44 12 62 25 31 59 22 49 62 59 23 55 2 56 62 1 13 61 29 26 63 22 59 56 3 15 62 58 41 0 57 37 16 248 -29 54 50 13 62 41 15 57 20 56 63 16 1 53 13 33 62 16 24 59 20 27 63 40 23 54 9 50 63 14 27 0 57 43 16 246 -30 53 0 2 62 56 38 55 23 53 63 32 12 51 27 24 62 31 17 57 17 24 63 57 16 52 19 58 63 29 53 0 57 48 17 245 -31 51 13 1 63 11 42 53 30 51 63 48 2 49 44 1 62 45 54 55 19 10 64 13 43 50 33 5 63 45 2 0 57 53 17 243 -32 49 28 43 63 26 31 51 41 9 64 3 33 48 2 59 63 0 16 53 24 55 64 29 49 48 48 46 63 59 55 0 57 58 18 241 -32 47 46 43 63 41 5 49 54 17 64 18 47 46 23 59 63 14 25 51 33 59 64 45 35 47 6 37 64 14 35 0 58 3 18 239 -33 46 6 43 63 55 27 48 9 49 64 33 46 44 46 45 63 28 22 49 45 51 65 1 4 45 26 21 64 29 2 0 58 8 19 238 -34 44 28 26 64 9 36 46 27 24 64 48 32 43 11 2 63 42 9 48 0 5 65 16 19 43 47 41 64 43 18 0 58 13 19 236 -34 42 51 36 64 23 36 44 46 45 65 3 6 41 36 38 63 55 46 46 16 20 65 31 21 42 10 22 64 57 24 0 58 18 20 234 -35 41 16 2 64 37 25 43 7 35 65 17 30 40 3 21 64 9 14 44 34 18 65 46 11 40 34 14 65 11 21 0 58 24 20 233 -35 39 41 33 64 51 6 41 29 42 65 31 43 38 31 3 64 22 34 42 53 43 66 0 50 38 59 6 65 25 9 0 58 29 21 231 -36 38 7 58 65 4 39 39 52 53 65 45 48 36 59 34 64 35 45 41 14 21 66 15 20 37 24 47 65 38 49 0 58 34 21 230 -36 36 35 10 65 18 3 38 16 59 65 59 44 35 28 46 64 48 50 39 36 0 66 29 40 35 51 9 65 52 21 0 58 39 21 228 -37 35 3 0 65 31 21 36 41 49 66 13 32 33 58 33 65 1 47 37 58 30 66 43 52 34 18 5 66 5 47 0 58 44 22 226 -37 33 31 20 65 44 31 35 7 15 66 27 13 32 28 47 65 14 38 36 21 41 66 57 57 32 45 26 66 19 5 0 58 49 22 225 -37 32 0 5 65 57 35 33 33 10 66 40 47 30 59 23 65 27 23 34 45 24 67 11 54 31 13 7 66 32 18 0 58 54 22 223 -38 30 29 7 66 10 33 31 59 25 66 54 14 29 30 14 65 40 2 33 9 31 67 25 45 29 41 1 66 45 24 0 58 59 22 221 -38 28 58 21 66 23 25 30 25 55 67 7 36 28 1 16 65 52 35 31 33 55 67 39 29 28 9 1 66 58 25 0 59 5 23 220 -38 27 27 41 66 36 12 28 52 32 67 20 51 26 32 24 66 5 2 29 58 28 67 53 7 26 37 3 67 11 20 0 59 10 23 218 -39 25 57 2 66 48 53 27 19 12 67 34 1 25 3 31 66 17 24 28 23 3 68 6 39 25 5 1 67 24 9 0 59 15 23 216 -39 24 26 19 67 1 28 25 45 47 67 47 5 23 34 35 66 29 41 26 47 35 68 20 6 23 32 49 67 36 53 0 59 20 23 215 -39 22 55 26 67 13 59 24 12 12 68 0 4 22 5 30 66 41 53 25 11 56 68 33 27 22 0 23 67 49 33 0 59 25 23 213 -40 21 24 20 67 26 24 22 38 23 68 12 58 20 36 11 66 54 0 23 36 2 68 46 43 20 27 37 68 2 7 0 59 30 23 211 -40 19 52 55 67 38 45 21 4 12 68 25 47 19 6 36 67 6 2 21 59 46 68 59 54 18 54 27 68 14 36 0 59 35 24 210 -40 18 21 7 67 51 0 19 29 37 68 38 30 17 36 38 67 17 59 20 23 2 69 13 0 17 20 47 68 27 0 0 59 40 24 208 -40 16 48 50 68 3 11 17 54 30 68 51 9 16 6 14 67 29 51 18 45 45 69 26 0 15 46 33 68 39 20 0 59 46 24 206 -40 15 16 1 68 15 16 16 18 47 69 3 43 14 35 20 67 41 39 17 7 49 69 38 56 14 11 40 68 51 34 0 59 51 24 205 -41 13 42 36 68 27 17 14 42 23 69 16 12 13 3 52 67 53 21 15 29 8 69 51 47 12 36 3 69 3 43 0 59 56 24 203 -41 12 8 28 68 39 13 13 5 12 69 28 35 11 31 45 68 4 59 13 49 37 70 4 33 10 59 37 69 15 48 1 0 1 24 201 -41 10 33 34 68 51 3 11 27 10 69 40 54 9 58 55 68 16 31 12 9 10 70 17 13 9 22 17 69 27 47 1 0 6 24 199 -41 8 57 49 69 2 49 9 48 10 69 53 8 8 25 17 68 27 59 10 27 40 70 29 49 7 43 58 69 39 41 1 0 11 24 198 -41 7 21 8 69 14 29 8 8 8 70 5 16 6 50 48 68 39 21 8 45 1 70 42 19 6 4 34 69 51 29 1 0 16 24 196 -41 5 43 27 69 26 4 6 26 57 70 17 18 5 15 23 68 50 38 7 1 8 70 54 43 4 24 1 70 3 12 1 0 22 24 194 -41 4 4 39 69 37 33 4 44 32 70 29 15 3 38 57 69 1 49 5 15 54 71 7 2 2 42 11 70 14 48 1 0 27 24 192 -41 2 24 40 69 48 57 3 0 46 70 41 6 2 1 25 69 12 55 3 29 11 71 19 15 0 59 1 70 26 19 1 0 32 24 190 -41 0 43 25 70 0 14 1 15 33 70 52 51 0 22 43 69 23 55 1 40 53 71 31 21 - 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38 29 43 74 39 12 - 39 1 45 73 33 47 1 2 9 18 148 -37 - 38 11 16 73 4 41 - 39 57 5 74 3 27 - 37 6 41 72 24 20 - 41 25 29 74 46 39 - 41 46 4 73 40 47 1 2 14 18 145 -37 - 40 49 11 73 11 43 - 42 48 30 74 10 25 - 39 36 33 72 31 21 - 44 28 33 74 53 31 - 44 36 40 73 47 16 1 2 19 17 142 -36 - 43 32 50 73 18 16 - 45 46 53 74 16 49 - 42 11 30 72 37 57 - 47 39 41 74 59 44 - 47 34 14 73 53 10 1 2 25 17 139 -35 - 46 22 48 73 24 17 - 48 52 59 74 22 34 - 44 51 59 72 44 6 - 50 59 52 75 5 11 - 50 39 34 73 58 25 1 2 30 16 136 -35 - 49 19 47 73 29 42 - 52 7 45 74 27 35 - 47 38 37 72 49 42 - 54 30 19 75 9 46 - 53 53 40 74 2 54 1 2 35 15 133 -34 - 52 24 37 73 34 27 - 55 32 20 74 31 45 - 50 32 4 72 54 44 - 58 12 32 75 13 20 - 57 17 44 74 6 31 1 2 40 15 130 -33 - 55 38 21 73 38 25 - 59 8 14 74 34 56 - 53 33 10 72 59 5 - 62 8 31 75 15 42 - 60 53 22 74 9 7 1 2 45 14 126 -33 - 59 2 17 73 41 29 - 62 57 23 74 36 57 - 56 42 56 73 2 40 - 66 20 57 75 16 36 - 64 42 38 74 10 31 1 2 50 13 122 -32 - 62 38 7 73 43 30 - 67 2 25 74 37 33 - 60 2 41 73 5 23 - 70 53 45 75 15 41 - 68 48 29 74 10 25 1 2 55 12 118 -31 - 66 28 8 73 44 15 - 71 27 10 74 36 23 - 63 34 6 73 7 3 - 75 52 53 75 12 26 - 73 15 10 74 8 29 1 3 0 11 114 -30 - 70 35 34 73 43 27 - 76 17 29 74 32 58 - 67 19 29 73 7 28 - 81 28 32 75 5 56 - 78 9 26 74 4 6 1 3 6 10 109 -29 - 75 5 16 73 40 40 - 81 43 21 74 26 25 - 71 22 6 73 6 21 - 88 0 55 74 54 32 - 83 43 16 73 56 16 1 3 11 8 104 -27 - 80 5 11 73 35 15 - 88 4 36 74 15 5 - 75 46 52 73 3 16 - 96 24 44 74 33 43 - 90 22 13 73 42 53 1 3 16 7 97 -25 - 85 50 4 73 25 56 - 96 14 54 73 54 36 - 80 41 52 72 57 33 ... .. .. .. .. .. - 99 28 53 73 17 20 1 3 21 4 88 -23 - 92 54 36 73 9 55 ... .. .. .. .. .. - 86 22 23 72 47 56 ... .. .. .. .. .. ... .. .. .. .. .. .. .. .. .. .. .. -103 52 3 72 35 4 ... .. .. .. .. .. - 93 25 6 72 31 26 ... .. .. .. .. .. ... .. .. .. .. .. .. .. .. .. .. .. ... .. .. .. .. .. ... .. .. .. .. .. -104 49 47 71 53 55 ... .. .. .. .. .. Data for the target star ------------------------ * name: TYC 0186-02560-1 * constellation : Canis Minor * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 30 20.6086 DE: +04 18 58.108 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .020 ) * V mag [mag]: 11.5 * B mag [mag]: 12.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (219) Thusnelda approx. diameter [km]: 40 approx. diameter ["]: .034 distance from Earth [AU]: 1.63800 * 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, 0.013, 96° remarks: * orbital elements for (219) Thusnelda : Mean anomaly = 104.98626663 deg Arg. of pericenter = 142.30248570 deg Long. of node = 200.94671244 deg Inclination = 10.84125244 deg Eccentricity = 0.22320490 Semimajor axis = 2.35443633 AU Perihelion dist = 1.82891460 AU Mag: H = 9.10, G = 0.15 Epoch of elements : MJD 54472.04100000 TDT (2008 Jan 07.041) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 07 219 Thusnelda 1h 0.1m UT 11.5 7 30 20.609 4 18 58.11TYC 0186-02560-1 12.4 13.0 40 3.1 1.638 -2.621 4.63 -8.425 4.316 166.44 -22.47 1.0017 .10687 .90516 -7.30223 0.86031 -0.00051 0.00185 2000 104.4294442008 1 5.00000142.302486200.946712 10.8412520.223204902.354436331.828914609.325 0.15 RATE 2.7281840 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.027 0.024 92.6 1.710 0.024 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 02, 23:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org