IOTA/IOTA-ES occultation update for (547) Praxedis / TYC 4943-01006-1 event on 2008 Apr 04, 04:50 UT Visible from USA, Canada Summary ------- On 2008 Apr 04 UT, the 58 km diameter asteroid (547) Praxedis will occult a 11.6 mag star in the constellation Virgo for observers along a path across USA, Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.8 mag to 14.3 mag (the magnitude of the asteroid) for at most 3.6 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: 69 * date and approx. time of event: 2008 Apr 04, 04:45 - 2008 Apr 04, 04:56 UT * magnitude of target star: 11.6 * magnitude drop [mag]: 2.8 * estimated maximum duration [s]: 3.6 * Moon: 5 % sunlit, 164° distance * Sun: 170° distance * rough path description: USA, Canada The occultation path -------------------- * approximate projected width [km]: 69 * 1 sigma uncertainty interval [path widths]: +/- 0.85 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .026 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .026", 2° ) * approx speed of asteroid's shadow [km/s]: 16.2728 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4943-01006-1 by 547 Praxedis on 2008 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 -143 56 9 70 0 0 4 56 9 6 119 -1 -141 49 37 -146 9 55 -138 27 51 -150 19 0 Latitude Latitude Latitude Latitude -143 0 0 69 50 54 4 56 9 6 119 -1 70 11 45 69 30 8 70 47 24 68 55 3 -142 0 0 69 40 48 4 56 8 6 120 -2 70 1 46 69 19 55 70 37 38 68 44 38 -141 0 0 69 30 18 4 56 8 7 121 -2 69 51 24 69 9 18 70 27 29 68 33 49 -140 0 0 69 19 25 4 56 8 7 122 -3 69 40 39 68 58 17 70 16 57 68 22 35 -139 0 0 69 8 7 4 56 7 7 123 -3 69 29 29 68 46 52 70 6 1 68 10 56 -138 0 0 68 56 24 4 56 7 8 124 -3 69 17 54 68 35 0 69 54 41 67 58 51 -137 0 0 68 44 15 4 56 6 8 125 -4 69 5 54 68 22 43 69 42 55 67 46 20 -136 0 0 68 31 40 4 56 6 9 126 -4 68 53 27 68 10 0 69 30 44 67 33 22 -135 0 0 68 18 38 4 56 5 9 127 -5 68 40 34 67 56 48 69 18 5 67 19 57 -134 0 0 68 5 8 4 56 5 10 128 -5 68 27 12 67 43 9 69 5 0 67 6 3 -133 0 0 67 51 9 4 56 4 10 129 -6 68 13 23 67 29 1 68 51 26 66 51 40 -132 0 0 67 36 40 4 56 4 10 130 -6 67 59 4 67 14 24 68 37 24 66 36 47 -131 0 0 67 21 42 4 56 3 11 131 -6 67 44 15 66 59 16 68 22 52 66 21 23 -130 0 0 67 6 13 4 56 2 11 132 -7 67 28 56 66 43 37 68 7 49 66 5 28 -129 0 0 66 50 12 4 56 1 12 132 -7 67 13 5 66 27 27 67 52 15 65 49 1 -128 0 0 66 33 39 4 56 0 12 133 -8 66 56 41 66 10 43 67 36 10 65 32 2 -127 0 0 66 16 32 4 56 0 13 134 -8 66 39 45 65 53 26 67 19 31 65 14 28 -126 0 0 65 58 51 4 55 59 13 135 -9 66 22 14 65 35 35 67 2 19 64 56 20 -125 0 0 65 40 35 4 55 58 14 136 -9 66 4 9 65 17 9 66 44 31 64 37 36 -124 0 0 65 21 43 4 55 57 14 137 -10 65 45 27 64 58 6 66 26 8 64 18 16 -123 0 0 65 2 14 4 55 56 15 138 -10 65 26 9 64 38 27 66 7 9 63 58 19 -122 0 0 64 42 7 4 55 54 15 139 -11 65 6 13 64 18 9 65 47 32 63 37 44 -121 0 0 64 21 21 4 55 53 16 140 -11 64 45 38 63 57 13 65 27 16 63 16 30 -120 0 0 63 59 56 4 55 52 16 141 -12 64 24 24 63 35 37 65 6 21 62 54 36 -119 0 0 63 37 50 4 55 51 17 142 -13 64 2 29 63 13 20 64 44 46 62 32 1 -118 0 0 63 15 3 4 55 49 18 143 -13 63 39 53 62 50 22 64 22 29 62 8 45 -117 0 0 62 51 33 4 55 48 18 144 -14 63 16 34 62 26 41 63 59 29 61 44 46 -116 0 0 62 27 20 4 55 46 19 145 -14 62 52 32 62 2 17 63 35 47 61 20 4 -115 0 0 62 2 22 4 55 44 19 145 -15 62 27 46 61 37 9 63 11 20 60 54 38 -114 0 0 61 36 40 4 55 43 20 146 -16 62 2 14 61 11 15 62 46 7 60 28 27 -113 0 0 61 10 11 4 55 41 21 147 -16 61 35 57 60 44 36 62 20 9 60 1 30 -112 0 0 60 42 56 4 55 39 21 148 -17 61 8 52 60 17 10 61 53 23 59 33 46 -111 0 0 60 14 53 4 55 37 22 149 -18 60 41 0 59 48 57 61 25 49 59 5 15 -110 0 0 59 46 1 4 55 35 23 150 -18 60 12 19 59 19 55 60 57 27 58 35 57 -109 0 0 59 16 21 4 55 32 23 151 -19 59 42 49 58 50 5 60 28 15 58 5 50 -108 0 0 58 45 51 4 55 30 24 152 -20 59 12 29 58 19 25 59 58 13 57 34 54 -107 0 0 58 14 31 4 55 28 25 153 -20 58 41 18 57 47 55 59 27 19 57 3 8 -106 0 0 57 42 19 4 55 25 25 154 -21 58 9 17 57 15 34 58 55 35 56 30 32 -105 0 0 57 9 17 4 55 22 26 155 -22 57 36 24 56 42 23 58 22 58 55 57 5 -104 0 0 56 35 23 4 55 19 27 156 -23 57 2 39 56 8 20 57 49 29 55 22 49 -103 0 0 56 0 37 4 55 16 28 157 -24 56 28 1 55 33 26 57 15 6 54 47 41 -102 0 0 55 25 0 4 55 13 28 158 -24 55 52 32 54 57 40 56 39 51 54 11 42 -101 0 0 54 48 30 4 55 10 29 159 -25 55 16 10 54 21 3 56 3 43 53 34 52 -100 0 0 54 11 8 4 55 7 30 160 -26 54 38 55 53 43 35 55 26 41 52 57 12 - 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Uncertainty in time = +/- 3 secs [Prediction of 2008 Mar 28.0] Data for the target star ------------------------ * name: TYC 4943-01006-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 16 11.2439 DE: -04 09 20.113 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .027 ) * V mag [mag]: 11.6 * B mag [mag]: 12.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (547) Praxedis approx. diameter [km]: 58 approx. diameter ["]: .034 distance from Earth [AU]: 2.37000 * orbital information: orbit source: Preston date of fit: 2008 Mar 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 755 number of rejected observations: 33 time covered by the observations: 1904 Oct 15 - 2008 Feb 10 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.015, 97° remarks: * orbital elements for (547) Praxedis : Mean anomaly = 147.56314998 deg Arg. of pericenter = 195.49950905 deg Long. of node = 193.25396808 deg Inclination = 16.90071163 deg Eccentricity = 0.23753104 Semimajor axis = 2.77115485 AU Perihelion dist = 2.11291955 AU Mag: H = 9.65, G = 0.15 Epoch of elements : MJD 54560.20200000 TDT (2008 Apr 04.202) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 4 547 Praxedis 4h 50.8m UT 11.6 12 16 11.244- 4 9 20.11TYC 4943-01006-1 12.2 14.3 58 3.6 2.370 -1.776 21.33 -81.5231 -4.161 108.06 5.83 4.8459 0.34385 0.42863 -7.16322 5.74886 0.00095 -0.00017 2000 147.5199922008 4 4.00000195.499509193.253968 16.9007120.23753104 2.7711549 2.1129196 9.5 5.00.15 RATE 2.1365490 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.026 2 1.85 0.029 0 54553.5020080404_1006-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 28, 06:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org