IOTA/IOTA-ES occultation update for (514) Armida / TYC 6180-00114-1 event on 2008 May 11, 06:52 UT Visible from Canada Summary ------- On 2008 May 11 UT, the 106 km diameter asteroid (514) Armida will occult a 12.0 mag star in the constellation Libra for observers along a path across Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 13.4 mag (the magnitude of the asteroid) for at most 8.1 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: 96 * date and approx. time of event: 2008 May 11, 06:51 - 2008 May 11, 06:53 UT * magnitude of target star: 12.0 * magnitude drop [mag]: 1.7 * estimated maximum duration [s]: 8.1 * Moon: 41 % sunlit, 99° distance * Sun: 176° distance * rough path description: Canada The occultation path -------------------- * approximate projected width [km]: 582 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 3.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .028", 96° ) * approx speed of asteroid's shadow [km/s]: 13.1444 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6180-00114-1 by 514 Armida on 2008 May 11 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 - 80 51 34 66 0 0 6 53 48 1 205 -4 ... .. .. - 87 21 1 ... .. .. ... .. .. - 81 35 5 65 0 0 6 53 47 2 204 -5 - 72 40 10 - 87 41 41 ... .. .. ... .. .. - 81 59 49 64 0 0 6 53 45 3 204 -6 - 73 48 1 - 87 49 23 ... .. .. ... .. .. - 82 8 39 63 0 0 6 53 42 4 204 -7 - 74 24 21 - 87 45 37 ... .. .. - 91 38 22 - 82 3 30 62 0 0 6 53 38 5 204 -8 - 74 36 9 - 87 31 29 ... .. .. - 91 18 41 - 81 45 34 61 0 0 6 53 34 6 204 -9 - 74 26 51 - 87 7 41 ... .. .. - 90 50 54 - 81 15 31 60 0 0 6 53 29 6 204 -10 - 73 57 46 - 86 34 43 ... .. .. - 90 15 24 - 80 33 30 59 0 0 6 53 22 7 205 -11 - 73 8 25 - 85 52 46 ... .. .. - 89 32 22 - 79 39 12 58 0 0 6 53 15 8 206 -11 - 71 56 5 - 85 1 48 ... .. .. - 88 41 50 - 78 31 41 57 0 0 6 53 7 9 207 -12 - 70 13 33 - 84 1 31 ... .. .. - 87 43 39 - 77 9 7 56 0 0 6 52 57 9 208 -13 - 67 39 50 - 82 51 15 ... .. .. - 86 37 28 - 75 28 6 55 0 0 6 52 46 10 210 -13 ... .. .. - 81 29 57 ... .. .. - 85 22 41 - 73 22 3 54 0 0 6 52 33 10 212 -13 ... .. .. - 79 55 47 ... .. .. - 83 58 22 Latitude Latitude Latitude Latitude - 73 0 0 53 50 54 6 52 31 10 212 -13 58 51 49 50 56 2 .. .. .. 49 1 31 - 72 0 0 53 27 59 6 52 25 10 213 -14 58 2 46 50 37 51 .. .. .. 48 45 18 - 71 0 0 53 7 36 6 52 20 10 214 -14 57 24 35 50 21 28 .. .. .. 48 30 38 - 70 0 0 52 49 34 6 52 14 10 215 -13 56 53 30 50 6 49 .. .. .. 48 17 28 - 69 0 0 52 33 45 6 52 9 10 216 -13 56 27 45 49 53 50 .. .. .. 48 5 45 - 68 0 0 52 20 2 6 52 3 9 217 -13 56 6 20 49 42 29 .. .. .. 47 55 29 - 67 0 0 52 8 20 6 51 58 9 217 -13 55 48 39 49 32 44 .. .. .. 47 46 38 - 66 0 0 51 58 35 6 51 53 9 218 -13 55 34 15 49 24 34 .. .. .. 47 39 12 - 65 0 0 51 50 44 6 51 49 9 219 -13 55 22 54 49 17 56 .. .. .. 47 33 9 - 64 0 0 51 44 44 6 51 44 8 220 -12 55 14 23 49 12 50 .. .. .. 47 28 29 - 63 0 0 51 40 34 6 51 40 8 221 -12 55 8 35 49 9 16 .. .. .. 47 25 11 - 62 0 0 51 38 13 6 51 36 8 222 -12 55 5 25 49 7 13 .. .. .. 47 23 16 - 61 0 0 51 37 40 6 51 32 7 223 -11 55 4 51 49 6 40 .. .. .. 47 22 43 - 60 0 0 51 38 56 6 51 28 7 223 -11 55 6 52 49 7 38 .. .. .. 47 23 33 - 59 0 0 51 42 1 6 51 25 6 224 -10 55 11 32 49 10 8 .. .. .. 47 25 45 - 58 0 0 51 46 57 6 51 21 6 225 -10 55 18 55 49 14 9 .. .. .. 47 29 20 - 57 0 0 51 53 45 6 51 18 5 226 -9 55 29 8 49 19 43 .. .. .. 47 34 19 - 56 0 0 52 2 28 6 51 16 5 227 -9 55 42 24 49 26 52 .. .. .. 47 40 43 - 55 0 0 52 13 9 6 51 13 4 227 -8 55 58 59 49 35 36 .. .. .. 47 48 32 - 54 0 0 52 25 53 6 51 11 4 228 -8 56 19 17 49 45 58 .. .. .. 47 57 49 - 53 0 0 52 40 46 6 51 9 3 229 -7 56 43 55 49 57 59 .. .. .. 48 8 33 - 52 0 0 52 57 53 6 51 8 2 230 -6 .. .. .. 50 11 44 .. .. .. .. .. .. - 51 0 0 53 17 24 6 51 7 2 231 -6 .. .. .. 50 27 15 .. .. .. .. .. .. - 50 0 0 53 39 31 6 51 6 1 231 -5 .. .. .. 50 44 36 .. .. .. .. .. .. - 49 0 0 54 4 27 6 51 5 0 232 -4 .. .. .. 51 3 53 .. .. .. .. .. .. Uncertainty in time = +/- 4 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: TYC 6180-00114-1 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 01 30.4372 DE: -20 55 47.011 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .023 ) * V mag [mag]: 12.0 * B mag [mag]: 12.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (514) Armida approx. diameter [km]: 106 approx. diameter ["]: .068 distance from Earth [AU]: 2.15800 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1069 number of rejected observations: 108 time covered by the observations: 1903 Aug 24 - 2008 May 01 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.015, 104° remarks: * orbital elements for (514) Armida : Mean anomaly = 211.56206185 deg Arg. of pericenter = 111.55982948 deg Long. of node = 268.98550904 deg Inclination = 3.88580806 deg Eccentricity = 0.04639926 Semimajor axis = 3.04473640 AU Perihelion dist = 2.90346288 AU Mag: H = 9.05, G = 0.15 Epoch of elements : MJD 54597.28700000 TDT (2008 May 11.287) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 11 514 Armida 6h 52.5m UT 12.0 15 1 30.437-20 55 47.01TYC 6180-00114-1 12.3 13.4 106 8.1 2.158 -2.026 10.38 -107.1730 -20.932 75.98 18.00 6.8744 0.33756 0.92349 -6.96797 2.54746 0.00032 0.00028 2000 210.2102132008 5 4.00000111.559829268.985509 3.8858080.04639926 3.0447364 2.9034629 9.0 5.00.15 RATE 1.8551520 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.028 96 1.41 0.028 0 54594.5020080511_0114-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 02:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org