IOTA/IOTA-ES occultation update for (379) Huenna / 2UCAC 25667665 event on 2008 May 14, 07:35 UT Visible from S USA Summary ------- On 2008 May 14 UT, the 92 km diameter asteroid (379) Huenna will occult a 12.7 mag star in the constellation Capricornus for observers along a path across S USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.6 mag to 14.0 mag (the magnitude of the asteroid) for at most 8.7 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: 48 * date and approx. time of event: 2008 May 14, 07:34 - 2008 May 14, 07:42 UT * midpoint of event [JD]: 2454600.82002917 * magnitude of target star: 12.7 * magnitude drop [mag]: 1.6 * estimated maximum duration [s]: 8.7 * Moon: 71 % sunlit, 139° distance * Sun: 106° distance * rough path description: S USA The occultation path -------------------- * approximate projected width [km]: 153 * 1 sigma uncertainty interval [path widths]: +/- 1.35 * 1 sigma uncertainty interval [seconds]: +/- 11.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .075 +/- .073) * 1 sigma uncertainty ellipse (major, minor, PA): ( .075", .073", 89° ) * approx speed of asteroid's shadow [km/s]: 10.6311 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 25667665 by 379 Huenna on 2008 May 14 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 - 43 0 0 38 25 9 7 42 38 35 174 -1 37 38 49 39 12 26 35 37 58 41 25 26 - 44 0 0 38 0 19 7 42 28 35 173 -2 37 14 12 38 47 22 35 13 54 40 59 38 - 45 0 0 37 35 58 7 42 19 36 172 -2 36 50 4 38 22 47 34 50 18 40 34 20 - 46 0 0 37 12 6 7 42 10 36 171 -3 36 26 26 37 58 41 34 27 11 40 9 32 - 47 0 0 36 48 45 7 42 0 36 169 -4 36 3 17 37 35 6 34 4 34 39 45 16 - 48 0 0 36 25 54 7 41 51 36 168 -5 35 40 39 37 12 3 33 42 27 39 21 32 - 49 0 0 36 3 36 7 41 42 36 167 -6 35 18 33 36 49 31 33 20 50 38 58 21 - 50 0 0 35 41 49 7 41 32 37 166 -7 34 56 58 36 27 32 32 59 45 38 35 43 - 51 0 0 35 20 35 7 41 22 37 164 -8 34 35 56 36 6 5 32 39 12 38 13 40 - 52 0 0 34 59 55 7 41 13 37 163 -9 34 15 27 35 45 13 32 19 11 37 52 11 - 53 0 0 34 39 49 7 41 3 37 162 -10 33 55 32 35 24 55 31 59 44 37 31 17 - 54 0 0 34 20 17 7 40 54 37 160 -11 33 36 11 35 5 11 31 40 49 37 10 59 - 55 0 0 34 1 20 7 40 44 37 159 -12 33 17 24 34 46 3 31 22 29 36 51 17 - 56 0 0 33 42 58 7 40 34 37 158 -12 32 59 13 34 27 31 31 4 43 36 32 12 - 57 0 0 33 25 12 7 40 25 37 157 -13 32 41 37 34 9 34 30 47 31 36 13 44 - 58 0 0 33 8 2 7 40 15 37 155 -14 32 24 37 33 52 14 30 30 55 35 55 53 - 59 0 0 32 51 29 7 40 6 37 154 -15 32 8 13 33 35 31 30 14 54 35 38 40 - 60 0 0 32 35 32 7 39 56 36 153 -16 31 52 25 33 19 25 29 59 28 35 22 6 - 61 0 0 32 20 12 7 39 47 36 152 -17 31 37 14 33 3 56 29 44 39 35 6 10 - 62 0 0 32 5 30 7 39 37 36 150 -18 31 22 40 32 49 5 29 30 26 34 50 52 - 63 0 0 31 51 26 7 39 28 36 149 -19 31 8 44 32 34 52 29 16 49 34 36 14 - 64 0 0 31 37 59 7 39 19 36 148 -19 30 55 25 32 21 17 29 3 49 34 22 15 - 65 0 0 31 25 10 7 39 10 35 147 -20 30 42 44 32 8 21 28 51 26 34 8 56 - 66 0 0 31 13 0 7 39 1 35 146 -21 30 30 40 31 56 3 28 39 40 33 56 16 - 67 0 0 31 1 28 7 38 52 35 145 -22 30 19 15 31 44 25 28 28 32 33 44 16 - 68 0 0 30 50 35 7 38 43 34 144 -23 30 8 28 31 33 25 28 18 1 33 32 57 - 69 0 0 30 40 21 7 38 34 34 143 -23 29 58 20 31 23 4 28 8 7 33 22 17 - 70 0 0 30 30 45 7 38 25 33 141 -24 29 48 50 31 13 23 27 58 52 33 12 18 - 71 0 0 30 21 49 7 38 16 33 140 -25 29 39 59 31 4 21 27 50 14 33 2 59 - 72 0 0 30 13 32 7 38 8 33 139 -26 29 31 47 30 55 58 27 42 14 32 54 21 - 73 0 0 30 5 53 7 37 59 32 138 -26 29 24 13 30 48 15 27 34 52 32 46 24 - 74 0 0 29 58 54 7 37 51 32 137 -27 29 17 18 30 41 11 27 28 8 32 39 7 - 75 0 0 29 52 35 7 37 43 31 136 -28 29 11 3 30 34 47 27 22 2 32 32 30 - 76 0 0 29 46 54 7 37 35 30 136 -29 29 5 26 30 29 3 27 16 34 32 26 35 - 77 0 0 29 41 53 7 37 27 30 135 -29 29 0 28 30 23 59 27 11 44 32 21 20 - 78 0 0 29 37 31 7 37 19 29 134 -30 28 56 9 30 19 34 27 7 32 32 16 46 - 79 0 0 29 33 49 7 37 12 29 133 -30 28 52 29 30 15 48 27 3 59 32 12 53 - 80 0 0 29 30 45 7 37 4 28 132 -31 28 49 28 30 12 43 27 1 3 32 9 40 - 81 0 0 29 28 21 7 36 57 27 131 -32 28 47 6 30 10 17 26 58 46 32 7 8 - 82 0 0 29 26 36 7 36 50 27 130 -32 28 45 23 30 8 30 26 57 7 32 5 17 - 83 0 0 29 25 31 7 36 43 26 130 -33 28 44 18 30 7 23 26 56 5 32 4 6 - 84 0 0 29 25 4 7 36 36 25 129 -33 28 43 53 30 6 56 26 55 42 32 3 36 - 85 0 0 29 25 17 7 36 30 25 128 -34 28 44 6 30 7 8 26 55 56 32 3 46 - 86 0 0 29 26 8 7 36 23 24 127 -34 28 44 57 30 7 59 26 56 48 32 4 37 - 87 0 0 29 27 38 7 36 17 23 127 -35 28 46 27 30 9 29 26 58 18 32 6 8 - 88 0 0 29 29 47 7 36 11 22 126 -35 28 48 36 30 11 39 27 0 25 32 8 19 - 89 0 0 29 32 35 7 36 5 22 125 -36 28 51 22 30 14 27 27 3 10 32 11 9 - 90 0 0 29 36 0 7 35 59 21 124 -36 28 54 47 30 17 54 27 6 32 32 14 40 - 91 0 0 29 40 5 7 35 54 20 124 -36 28 58 50 30 22 0 27 10 31 32 18 51 - 92 0 0 29 44 47 7 35 49 19 123 -37 29 3 30 30 26 44 27 15 7 32 23 41 - 93 0 0 29 50 8 7 35 44 19 123 -37 29 8 49 30 32 7 27 20 20 32 29 10 - 94 0 0 29 56 6 7 35 39 18 122 -37 29 14 45 30 38 8 27 26 10 32 35 19 - 95 0 0 30 2 42 7 35 34 17 121 -38 29 21 18 30 44 47 27 32 36 32 42 6 - 96 0 0 30 9 55 7 35 30 16 121 -38 29 28 28 30 52 3 27 39 39 32 49 33 - 97 0 0 30 17 46 7 35 26 15 120 -38 29 36 15 30 59 58 27 47 17 32 57 38 - 98 0 0 30 26 14 7 35 22 14 119 -38 29 44 39 31 8 30 27 55 32 33 6 22 - 99 0 0 30 35 18 7 35 18 14 119 -39 29 53 40 31 17 38 28 4 22 33 15 44 -100 0 0 30 45 0 7 35 14 13 118 -39 30 3 17 31 27 24 28 13 48 33 25 43 -101 0 0 30 55 17 7 35 11 12 118 -39 30 13 29 31 37 47 28 23 49 33 36 21 -102 0 0 31 6 11 7 35 8 11 117 -39 30 24 18 31 48 46 28 34 25 33 47 36 -103 0 0 31 17 41 7 35 5 10 117 -39 30 35 42 32 0 21 28 45 36 33 59 28 -104 0 0 31 29 46 7 35 3 9 116 -39 30 47 42 32 12 32 28 57 22 34 11 57 -105 0 0 31 42 26 7 35 0 9 115 -39 31 0 16 32 25 19 29 9 41 34 25 3 -106 0 0 31 55 41 7 34 58 8 115 -39 31 13 25 32 38 41 .. .. .. 34 38 45 -107 0 0 32 9 31 7 34 56 7 114 -39 31 27 8 32 52 38 .. .. .. 34 53 3 -108 0 0 32 23 56 7 34 54 6 114 -39 31 41 26 33 7 10 .. .. .. 35 7 57 -109 0 0 32 38 54 7 34 53 5 113 -38 31 56 17 33 22 16 .. .. .. 35 23 26 -110 0 0 32 54 26 7 34 52 4 113 -38 32 11 41 33 37 56 .. .. .. 35 39 29 -111 0 0 33 10 31 7 34 51 3 112 -38 32 27 38 33 54 9 .. .. .. 35 56 8 -112 0 0 33 27 9 7 34 50 2 112 -38 32 44 8 34 10 55 .. .. .. 36 13 20 -113 0 0 33 44 19 7 34 50 1 111 -38 33 1 10 34 28 15 .. .. .. 36 31 6 -114 0 0 34 2 2 7 34 49 1 110 -37 33 18 44 34 46 6 .. .. .. .. .. .. Uncertainty in time = +/- 12 secs [Prediction of 2008 Apr 21.0] Data for the target star ------------------------ * name: 2UCAC 25667665 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 38 50.5404 DE: -16 35 10.186 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .071, .071 ) * V mag [mag]: 12.7 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 309.8329207147 DE(deg): -16.5570597541 * Equation of equinoxes (radians) : 0.000040652767739 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (379) Huenna approx. diameter [km]: 92 approx. diameter ["]: .054 distance from Earth [AU]: 2.34400 * orbital information: orbit source: Preston date of fit: 2008 Apr 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1058 number of rejected observations: 111 time covered by the observations: 1900 Feb 23 - 2007 Sep 21 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.014, 77° remarks: * orbital elements for (379) Huenna : Mean anomaly = 314.02808788 deg Arg. of pericenter = 179.55731172 deg Long. of node = 172.11527190 deg Inclination = 1.66762055 deg Eccentricity = 0.18893632 Semimajor axis = 3.13709652 AU Perihelion dist = 2.54438504 AU Mag: H = 8.83, G = 0.15 Epoch of elements : MJD 54600.31600000 TDT (2008 May 14.316) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 14 379 Huenna 7h 40.8m UT 12.7 20 38 50.540-16 35 10.192UCAC 25667665 0.0 14.0 92 8.7 2.344 1.495 6.67 -37.9235 -16.587 63.88 18.75 7.6807 -0.23544 0.76230 5.73075 1.77895 -0.00519 -0.00141 2000 313.9720352008 514.00000179.557312172.115272 1.6676210.18893632 3.1370965 2.5443850 8.9 5.00.15 RATE 1.7738310 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.075 0.073 89 2.35 0.073 1 7 3336 54577.5020080514_667665 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 21, 17:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org