IOTA/IOTA-ES occultation update for (819) Barnardiana / TYC 6912-00814-1 event on 2008 May 12, 20:06 UT Visible from Russia Summary ------- On 2008 May 12 UT, the 14 km diameter asteroid (819) Barnardiana will occult a 10.4 mag star in the constellation Capricornus for observers along a path across Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.8 mag to 15.2 mag (the magnitude of the asteroid) for at most 1.2 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: 30 * date and approx. time of event: 2008 May 12, 20:03 - 2008 May 12, 20:07 UT * midpoint of event [JD]: 2454599.33778333 * magnitude of target star: 10.4 * magnitude drop [mag]: 4.8 * estimated maximum duration [s]: 1.2 * Moon: 57 % sunlit, 152° distance * Sun: 108° distance * rough path description: Russia The occultation path -------------------- * approximate projected width [km]: 42 * 1 sigma uncertainty interval [path widths]: +/- 2.22 * 1 sigma uncertainty interval [seconds]: +/- 3.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .049 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .051", .033", 73° ) * approx speed of asteroid's shadow [km/s]: 11.0909 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6912-00814-1 by 819 Barnardiana on 2008 May 12 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 Latitude Latitude Latitude Latitude 127 0 0 45 51 19 20 7 4 19 172 0 45 38 56 46 3 50 44 45 34 47 1 13 126 0 0 45 35 21 20 6 57 19 171 -1 45 23 6 45 47 45 44 30 12 46 44 33 125 0 0 45 20 36 20 6 49 19 170 -2 45 8 27 45 32 53 44 15 58 46 29 9 124 0 0 45 7 1 20 6 41 19 169 -3 44 54 58 45 19 12 44 2 53 46 14 59 123 0 0 44 54 37 20 6 34 19 168 -3 44 42 39 45 6 43 43 50 56 46 2 4 122 0 0 44 43 23 20 6 26 19 167 -4 44 31 30 44 55 24 43 40 6 45 50 21 121 0 0 44 33 19 20 6 19 19 166 -5 44 21 30 44 45 15 43 30 22 45 39 52 120 0 0 44 24 24 20 6 11 19 165 -5 44 12 38 44 36 17 43 21 46 45 30 35 119 0 0 44 16 37 20 6 4 19 164 -6 44 4 55 44 28 27 43 14 16 45 22 29 118 0 0 44 10 0 20 5 56 19 163 -7 43 58 20 44 21 46 43 7 52 45 15 35 117 0 0 44 4 30 20 5 49 19 162 -7 43 52 52 44 16 14 43 2 34 45 9 52 116 0 0 44 0 8 20 5 41 19 161 -8 43 48 33 44 11 51 42 58 22 45 5 19 115 0 0 43 56 54 20 5 34 18 160 -9 43 45 20 44 8 35 42 55 15 45 1 57 114 0 0 43 54 48 20 5 27 18 159 -9 43 43 15 44 6 28 42 53 14 44 59 45 113 0 0 43 53 49 20 5 20 18 158 -10 43 42 16 44 5 28 42 52 17 44 58 42 112 0 0 43 53 57 20 5 13 18 158 -11 43 42 25 44 5 37 42 52 26 44 58 50 111 0 0 43 55 13 20 5 6 17 157 -11 43 43 40 44 6 52 42 53 40 45 0 7 110 0 0 43 57 35 20 4 59 17 156 -12 43 46 2 44 9 16 42 55 59 45 2 34 109 0 0 44 1 5 20 4 53 17 155 -12 43 49 30 44 12 47 42 59 23 45 6 10 108 0 0 44 5 42 20 4 46 16 154 -13 43 54 5 44 17 25 43 3 52 45 10 57 107 0 0 44 11 26 20 4 40 16 153 -13 43 59 48 44 23 11 43 9 26 45 16 53 106 0 0 44 18 17 20 4 34 15 152 -14 44 6 36 44 30 5 43 16 5 45 23 59 105 0 0 44 26 16 20 4 28 15 151 -14 44 14 32 44 38 7 43 23 49 45 32 15 104 0 0 44 35 22 20 4 22 15 150 -14 44 23 35 44 47 16 43 32 38 45 41 42 103 0 0 44 45 36 20 4 16 14 150 -15 44 33 45 44 57 34 43 42 32 45 52 19 102 0 0 44 56 58 20 4 11 13 149 -15 44 45 3 45 9 1 43 53 32 46 4 7 101 0 0 45 9 28 20 4 6 13 148 -16 44 57 28 45 21 36 44 5 38 46 17 7 100 0 0 45 23 7 20 4 1 12 147 -16 45 11 2 45 35 21 44 18 49 46 31 18 99 0 0 45 37 55 20 3 56 12 146 -16 45 25 44 45 50 15 44 33 7 46 46 43 98 0 0 45 53 52 20 3 51 11 145 -16 45 41 34 46 6 19 44 48 31 47 3 20 97 0 0 46 11 0 20 3 47 10 145 -17 45 58 35 46 23 33 45 5 1 47 21 11 96 0 0 46 29 18 20 3 43 10 144 -17 46 16 44 46 41 59 45 22 39 47 40 17 95 0 0 46 48 47 20 3 39 9 143 -17 46 36 5 47 1 37 45 41 25 48 0 39 94 0 0 47 9 28 20 3 36 8 142 -17 46 56 37 47 22 28 46 1 19 48 22 18 93 0 0 47 31 21 20 3 32 8 141 -17 47 18 20 47 44 32 46 22 21 48 45 15 92 0 0 47 54 29 20 3 29 7 141 -17 47 41 17 48 7 52 46 44 33 49 9 31 91 0 0 48 18 51 20 3 26 6 140 -17 48 5 27 48 32 26 47 7 55 49 35 9 90 0 0 48 44 30 20 3 24 5 139 -17 48 30 52 48 58 19 47 32 27 50 2 9 89 0 0 49 11 26 20 3 22 5 138 -17 48 57 34 49 25 30 47 58 12 50 30 36 88 0 0 49 39 41 20 3 20 4 137 -17 49 25 33 49 54 1 48 25 9 51 0 30 87 0 0 50 9 17 20 3 19 3 137 -17 49 54 52 50 23 55 .. .. .. 51 31 54 86 0 0 50 40 16 20 3 17 2 136 -17 50 25 33 50 55 14 .. .. .. 52 4 53 85 0 0 51 12 40 20 3 17 1 135 -17 50 57 37 51 28 0 .. .. .. 52 39 31 84 0 0 51 46 33 20 3 16 1 134 -16 51 31 7 52 2 16 .. .. .. .. .. .. Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 31.0] Data for the target star ------------------------ * name: TYC 6912-00814-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 31 15.6545 DE: -25 13 55.628 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .022 ) * V mag [mag]: 10.4 * B mag [mag]: 11.4 * Apparent position with proper motion RA(deg): 307.9446777795 DE(deg): -25.2035229585 * Equation of equinoxes (radians) : 0.000041137470445 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (819) Barnardiana approx. diameter [km]: 14 approx. diameter ["]: .015 distance from Earth [AU]: 1.30800 * orbital information: orbit source: Preston date of fit: 2008 Feb 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1070 number of rejected observations: 48 time covered by the observations: 1904 Sep 19 - 2007 May 14 1 sigma uncertainty ellipse (major, minor, PA): 0.046, 0.025, 69° remarks: * orbital elements for (819) Barnardiana : Mean anomaly = 355.51002458 deg Arg. of pericenter = 305.92458977 deg Long. of node = 333.30551460 deg Inclination = 4.89597548 deg Eccentricity = 0.14199570 Semimajor axis = 2.19787412 AU Perihelion dist = 1.88578545 AU Mag: H = 11.88, G = 0.15 Epoch of elements : MJD 54598.83800000 TDT (2008 May 12.838) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 12 819 Barnardiana 20h 6.4m UT 10.4 20 31 15.655-25 13 55.63TYC 6912-00814-1 11.4 15.2 14 1.2 1.308 3.052 7.50 135.2496 -25.232 -122.51 18.39 20.1068 -0.16746 0.92781 6.15985 1.11541 -0.00462 -0.00099 2000 352.8366872008 5 4.00000305.924590333.305515 4.8959750.14199570 2.1978741 1.885785411.9 5.00.15 RATE 3.0248220 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.051 0.033 73 3.22 0.033 0 54556.5020080512_0814-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 31, 04:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org