IOTA/IOTA-ES occultation update for (3077) Henderson / HIP 75732 event on 2008 May 18, 18:57 UT Visible from Indonesia, Africa Summary ------- On 2008 May 18 UT, the 10 km diameter asteroid (3077) Henderson will occult a 7.2 mag star in the constellation Libra for observers along a path across Indonesia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 8.2 mag to 15.4 mag (the magnitude of the asteroid) for at most 0.9 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: . The event at a glimpse ---------------------- * Rank: 13 * date and approx. time of event: 2008 May 18, 18:47 - 2008 May 18, 19:06 UT * magnitude of target star: 7.2 * magnitude drop [mag]: 8.2 * estimated maximum duration [s]: 0.9 * Moon: 98 % sunlit, 12° distance * Sun: 176° distance * rough path description: Indonesia, Africa The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 5.05 * 1 sigma uncertainty interval [seconds]: +/- 6.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .072 +/- .051) * 1 sigma uncertainty ellipse (major, minor, PA): ( .073", .050", 101° ) * approx speed of asteroid's shadow [km/s]: 10.5891 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 75732 by 3077 Henderson on 2008 May 18 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 ' " Latitude Latitude Latitude Latitude - 5 0 0 30 26 15 19 6 50 3 116 0 30 29 26 30 23 4 31 1 37 .. .. .. - 4 0 0 30 1 11 19 6 50 3 117 -1 30 4 22 29 58 0 30 36 37 29 25 53 - 3 0 0 29 35 50 19 6 49 4 117 -2 29 39 1 29 32 39 30 11 19 29 0 29 - 2 0 0 29 10 12 19 6 48 5 118 -3 29 13 24 29 7 1 29 45 44 28 34 49 - 1 0 0 28 44 18 19 6 47 6 118 -4 28 47 30 28 41 6 29 19 53 28 8 52 0 0 0 28 18 8 19 6 46 7 119 -5 28 21 20 28 14 56 28 53 45 27 42 40 1 0 0 27 51 43 19 6 44 8 119 -6 27 54 56 27 48 31 28 27 23 27 16 12 2 0 0 27 25 3 19 6 42 9 120 -7 27 28 16 27 21 51 28 0 45 26 49 30 3 0 0 26 58 9 19 6 41 10 120 -8 27 1 22 26 54 57 27 33 53 26 22 34 4 0 0 26 31 2 19 6 39 11 121 -9 26 34 15 26 27 49 27 6 48 25 55 24 5 0 0 26 3 41 19 6 36 12 121 -10 26 6 55 26 0 28 26 39 29 25 28 2 6 0 0 25 36 9 19 6 34 13 122 -11 25 39 22 25 32 56 26 11 58 25 0 28 7 0 0 25 8 24 19 6 31 14 122 -12 25 11 38 25 5 11 25 44 15 24 32 42 8 0 0 24 40 29 19 6 28 15 123 -13 24 43 43 24 37 16 25 16 21 24 4 46 9 0 0 24 12 24 19 6 25 16 123 -14 24 15 37 24 9 10 24 48 17 23 36 39 10 0 0 23 44 8 19 6 22 17 123 -15 23 47 22 23 40 55 24 20 2 23 8 23 11 0 0 23 15 44 19 6 19 18 124 -16 23 18 58 23 12 31 23 51 39 22 39 58 12 0 0 22 47 12 19 6 15 19 124 -17 22 50 26 22 43 58 23 23 7 22 11 26 13 0 0 22 18 32 19 6 11 20 125 -18 22 21 46 22 15 18 22 54 28 21 42 45 14 0 0 21 49 46 19 6 7 21 125 -19 21 53 0 21 46 32 22 25 41 21 13 59 15 0 0 21 20 53 19 6 3 22 125 -20 21 24 7 21 17 40 21 56 49 20 45 6 16 0 0 20 51 56 19 5 58 23 126 -21 20 55 10 20 48 42 21 27 51 20 16 9 17 0 0 20 22 54 19 5 54 24 126 -22 20 26 7 20 19 40 20 58 49 19 47 7 18 0 0 19 53 48 19 5 49 25 127 -23 19 57 2 19 50 34 20 29 42 19 18 2 19 0 0 19 24 39 19 5 44 27 127 -24 19 27 53 19 21 25 20 0 33 18 48 54 20 0 0 18 55 28 19 5 39 28 128 -26 18 58 42 18 52 15 19 31 21 18 19 44 21 0 0 18 26 16 19 5 33 29 128 -27 18 29 29 18 23 2 19 2 8 17 50 33 22 0 0 17 57 3 19 5 28 30 128 -28 18 0 16 17 53 50 18 32 53 17 21 21 23 0 0 17 27 50 19 5 22 31 129 -29 17 31 3 17 24 37 18 3 39 16 52 10 24 0 0 16 58 38 19 5 16 32 129 -30 17 1 52 16 55 25 17 34 26 16 23 0 25 0 0 16 29 28 19 5 10 33 130 -31 16 32 41 16 26 15 17 5 14 15 53 51 26 0 0 16 0 21 19 5 3 34 130 -32 16 3 33 15 57 8 16 36 4 15 24 45 27 0 0 15 31 16 19 4 57 35 130 -33 15 34 29 15 28 4 16 6 58 14 55 43 28 0 0 15 2 16 19 4 50 36 131 -34 15 5 28 14 59 4 15 37 55 14 26 45 29 0 0 14 33 20 19 4 43 37 131 -35 14 36 32 14 30 8 15 8 57 13 57 51 30 0 0 14 4 30 19 4 36 38 132 -36 14 7 42 14 1 18 14 40 5 13 29 4 31 0 0 13 35 46 19 4 29 39 132 -37 13 38 58 13 32 34 14 11 18 13 0 22 32 0 0 13 7 9 19 4 21 40 133 -38 13 10 20 13 3 58 13 42 38 12 31 48 33 0 0 12 38 40 19 4 14 41 133 -39 12 41 51 12 35 28 13 14 6 12 3 21 34 0 0 12 10 19 19 4 6 42 134 -40 12 13 30 12 7 8 12 45 42 11 35 3 35 0 0 11 42 7 19 3 58 43 134 -41 11 45 17 11 38 56 12 17 27 11 6 54 36 0 0 11 14 4 19 3 50 44 135 -42 11 17 15 11 10 54 11 49 22 10 38 55 37 0 0 10 46 12 19 3 42 45 135 -43 10 49 22 10 43 2 11 21 27 10 11 6 38 0 0 10 18 31 19 3 34 46 136 -44 10 21 41 10 15 22 10 53 42 9 43 29 39 0 0 9 51 2 19 3 25 47 136 -45 9 54 12 9 47 53 10 26 10 9 16 3 40 0 0 9 23 45 19 3 17 48 137 -46 9 26 55 9 20 36 9 58 49 8 48 50 41 0 0 8 56 41 19 3 8 49 137 -47 8 59 50 8 53 33 9 31 42 8 21 49 42 0 0 8 29 51 19 2 59 50 138 -48 8 33 0 8 26 43 9 4 48 7 55 2 43 0 0 8 3 15 19 2 50 51 139 -49 8 6 23 8 0 7 8 38 7 7 28 30 44 0 0 7 36 53 19 2 41 52 139 -50 7 40 1 7 33 45 8 11 42 7 2 12 45 0 0 7 10 46 19 2 32 53 140 -51 7 13 54 7 7 39 7 45 31 6 36 9 46 0 0 6 44 56 19 2 23 54 141 -52 6 48 3 6 41 49 7 19 37 6 10 22 47 0 0 6 19 21 19 2 13 55 141 -53 6 22 28 6 16 14 6 53 58 5 44 52 48 0 0 5 54 3 19 2 4 55 142 -54 5 57 10 5 50 57 6 28 36 5 19 38 49 0 0 5 29 3 19 1 54 56 143 -55 5 32 9 5 25 57 6 3 32 4 54 41 50 0 0 5 4 20 19 1 45 57 144 -56 5 7 26 5 1 14 5 38 45 4 30 2 51 0 0 4 39 55 19 1 35 58 145 -57 4 43 0 4 36 50 5 14 16 4 5 42 52 0 0 4 15 49 19 1 25 59 146 -58 4 18 54 4 12 44 4 50 6 3 41 39 53 0 0 3 52 2 19 1 15 60 147 -59 3 55 6 3 48 57 4 26 14 3 17 56 54 0 0 3 28 34 19 1 5 61 148 -60 3 31 38 3 25 30 4 2 43 2 54 33 55 0 0 3 5 26 19 0 55 62 149 -61 3 8 30 3 2 22 3 39 30 2 31 29 56 0 0 2 42 38 19 0 45 62 151 -61 2 45 42 2 39 35 3 16 38 2 8 45 57 0 0 2 20 11 19 0 35 63 152 -62 2 23 14 2 17 8 2 54 7 1 46 22 58 0 0 1 58 4 19 0 25 64 153 -63 2 1 7 1 55 2 2 31 57 1 24 20 59 0 0 1 36 19 19 0 15 65 155 -64 1 39 22 1 33 17 2 10 7 1 2 38 60 0 0 1 14 56 19 0 5 65 156 -65 1 17 58 1 11 54 1 48 39 0 41 19 61 0 0 0 53 54 18 59 54 66 158 -66 0 56 55 0 50 52 1 27 33 0 20 21 62 0 0 0 33 14 18 59 44 67 160 -66 0 36 15 0 30 13 1 6 50 - 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Uncertainty in time = +/- 7 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: HIP 75732 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 28 18.6531 DE: -21 12 34.464 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .029, .018 ) * V mag [mag]: 7.2 * B mag [mag]: 8.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3077) Henderson approx. diameter [km]: 10 approx. diameter ["]: .010 distance from Earth [AU]: 1.35500 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 722 number of rejected observations: 20 time covered by the observations: 1942 Nov 05 - 2008 Apr 17 1 sigma uncertainty ellipse (major, minor, PA): 0.067, 0.047, 103° remarks: * orbital elements for (3077) Henderson : Mean anomaly = 181.88984392 deg Arg. of pericenter = 117.06921579 deg Long. of node = 297.55525214 deg Inclination = 1.47410849 deg Eccentricity = 0.05557718 Semimajor axis = 2.24059517 AU Perihelion dist = 2.11606922 AU Mag: H = 12.69, G = 0.15 Epoch of elements : MJD 54604.79000000 TDT (2008 May 18.790) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 18 3077 Henderson 18h 57.3m UT 7.2 15 28 18.653-21 12 34.46HIP 75732 8.2 15.4 10 0.9 1.355 -2.672 10.43 70.9166 -21.212 -105.21 19.76 18.9554 0.08445 0.30280 -5.75700 1.60599 0.00034 0.00014 2000 180.4821952008 514.00000117.069216297.555252 1.4741080.05557718 2.2405952 2.116069212.7 5.00.15 RATE 2.9387250 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.073 0.050 101 6.05 0.051 0 54594.5020080518__75732 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org