IOTA/IOTA-ES occultation update for (998) Bodea / TYC 1938-01455-1 event on 2007 Nov 01, 15:08 UT Visible from Japan, China Summary ------- On 2007 Nov 01 UT, the 38 km diameter asteroid (998) Bodea will occult a 11.3 mag star in the constellation Gemini for observers along a path across Japan, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.9 mag to 17.2 mag (the magnitude of the asteroid) for at most 4.7 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: 42 * date and approx. time of event: 2007 Nov 01, 14:56 - 2007 Nov 01, 15:21 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 5.9 * estimated maximum duration [s]: 4.7 * Moon: 53 % sunlit, 11° distance * Sun: 102° distance * rough path description: Japan, China The occultation path -------------------- * approximate projected width [km]: 39 * 1 sigma uncertainty interval [path widths]: +/- 1.57 * 1 sigma uncertainty interval [seconds]: +/- 9.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .045", .033", 116° ) * approx speed of asteroid's shadow [km/s]: 8.1036 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1938-01455-1 by 998 Bodea on 2007 Nov 01 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 109 0 0 28 15 2 14 56 0 0 58 -65 .. .. .. 28 27 35 .. .. .. 29 7 3 110 0 0 28 48 36 14 56 0 1 58 -65 28 36 6 29 1 7 .. .. .. 29 40 29 111 0 0 29 21 41 14 56 1 2 59 -66 29 9 13 29 34 10 .. .. .. 30 13 25 112 0 0 29 54 17 14 56 1 3 59 -66 29 41 51 30 6 43 29 2 54 30 45 52 113 0 0 30 26 23 14 56 2 4 60 -66 30 13 59 30 38 47 29 35 9 31 17 48 114 0 0 30 57 58 14 56 3 5 60 -67 30 45 37 31 10 20 30 6 54 31 49 14 115 0 0 31 29 2 14 56 5 6 61 -67 31 16 43 31 41 21 30 38 7 32 20 8 116 0 0 31 59 34 14 56 7 7 61 -67 31 47 18 32 11 52 31 8 50 32 50 31 117 0 0 32 29 35 14 56 8 8 62 -67 32 17 21 32 41 50 31 39 0 33 20 21 118 0 0 32 59 4 14 56 11 9 62 -68 32 46 52 33 11 16 32 8 39 33 49 40 119 0 0 33 28 0 14 56 13 10 63 -68 33 15 51 33 40 10 32 37 46 34 18 25 120 0 0 33 56 23 14 56 15 11 63 -68 33 44 17 34 8 30 33 6 20 34 46 38 121 0 0 34 24 14 14 56 18 12 64 -68 34 12 10 34 36 18 33 34 21 35 14 18 122 0 0 34 51 31 14 56 21 13 64 -68 34 39 30 35 3 33 34 1 49 35 41 24 123 0 0 35 18 15 14 56 24 14 65 -68 35 6 16 35 30 14 34 28 43 36 7 57 124 0 0 35 44 26 14 56 27 15 66 -68 35 32 30 35 56 22 34 55 5 36 33 57 125 0 0 36 10 3 14 56 31 16 66 -67 35 58 10 36 21 57 35 20 53 36 59 23 126 0 0 36 35 7 14 56 34 17 67 -67 36 23 16 36 46 58 35 46 8 37 24 16 127 0 0 36 59 37 14 56 38 18 68 -67 36 47 49 37 11 26 36 10 49 37 48 35 128 0 0 37 23 33 14 56 42 19 68 -67 37 11 48 37 35 19 36 34 56 38 12 20 129 0 0 37 46 57 14 56 46 19 69 -67 37 35 14 37 58 40 36 58 30 38 35 33 130 0 0 38 9 46 14 56 51 20 69 -66 37 58 6 38 21 27 37 21 31 38 58 11 131 0 0 38 32 2 14 56 55 21 70 -66 38 20 25 38 43 41 37 43 58 39 20 17 132 0 0 38 53 46 14 56 59 22 71 -66 38 42 11 39 5 21 38 5 52 39 41 49 133 0 0 39 14 55 14 57 4 23 71 -65 39 3 23 39 26 28 38 27 12 40 2 48 134 0 0 39 35 32 14 57 9 24 72 -65 39 24 2 39 47 3 38 48 0 40 23 14 135 0 0 39 55 36 14 57 14 25 73 -64 39 44 9 40 7 4 39 8 14 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37 15 20 51 20 299 58 2 40 49 3 6 27 2 0 40 3 46 48 - 81 0 0 2 12 50 15 20 57 19 299 59 2 0 4 2 25 38 1 20 3 3 5 52 - 80 0 0 1 32 26 15 21 2 18 299 60 1 19 42 1 45 11 0 39 48 2 25 18 - 79 0 0 0 52 26 15 21 7 16 299 61 0 39 44 1 5 8 - 0 0 2 1 45 7 - 78 0 0 0 12 50 15 21 12 15 299 62 0 0 11 0 25 30 - 0 39 27 1 5 21 - 77 0 0 - 0 26 19 15 21 16 14 299 64 - 0 38 56 - 0 13 42 - 1 18 26 0 26 1 - 76 0 0 - 1 5 1 15 21 20 13 299 65 - 1 17 35 - 0 52 27 - 1 56 57 - 0 12 52 - 75 0 0 - 1 43 15 15 21 24 12 299 66 - 1 55 47 - 1 30 43 - 2 35 1 - 0 51 17 - 74 0 0 - 2 21 0 15 21 27 10 299 67 - 2 33 29 - 2 8 31 - 3 12 34 - 1 29 13 - 73 0 0 - 2 58 16 15 21 30 9 299 68 - 3 10 41 - 2 45 49 - 3 49 38 - 2 6 40 - 72 0 0 - 3 35 0 15 21 32 8 299 70 - 3 47 23 - 3 22 36 - 4 26 11 - 2 43 36 - 71 0 0 - 4 11 13 15 21 34 7 299 71 - 4 23 33 - 3 58 52 - 5 2 13 - 3 20 0 - 70 0 0 - 4 46 54 15 21 36 6 299 72 - 4 59 11 - 4 34 36 - 5 37 42 - 3 55 53 - 69 0 0 - 5 22 2 15 21 38 5 299 73 - 5 34 17 - 5 9 47 - 6 12 39 - 4 31 13 - 68 0 0 - 5 56 37 15 21 39 3 299 74 - 6 8 49 - 5 44 25 - 6 47 2 - 5 6 0 - 67 0 0 - 6 30 39 15 21 40 2 299 75 - 6 42 48 - 6 18 29 .. .. .. - 5 40 13 - 66 0 0 - 7 4 6 15 21 40 1 299 76 - 7 16 12 - 6 51 59 .. .. .. - 6 13 52 - 65 0 0 - 7 36 58 15 21 40 0 299 78 .. .. .. - 7 24 54 .. .. .. - 6 46 56 Data for the target star ------------------------ * name: TYC 1938-01455-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 59 57.3999 DE: +28 17 36.131 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .018 ) * V mag [mag]: 11.3 * B mag [mag]: 12.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (998) Bodea approx. diameter [km]: 38 approx. diameter ["]: .021 distance from Earth [AU]: 2.52800 * orbital information: orbit source: Preston date of fit: 2007 Oct 23 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 461 number of rejected observations: 11 time covered by the observations: 1923 Aug 08 - 2007 Sep 21 1 sigma uncertainty ellipse (major, minor, PA): 0.042, 0.028, 120° remarks: * orbital elements for (998) Bodea : Mean anomaly = 58.97123002 deg Arg. of pericenter = 72.67952177 deg Long. of node = 301.30841190 deg Inclination = 15.47757885 deg Eccentricity = 0.20827845 Semimajor axis = 3.12535447 AU Perihelion dist = 2.47441048 AU Mag: H = 11.45, G = 0.15 Epoch of elements : MJD 54405.63100000 TDT (2007 Nov 01.631) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Nov 01 998 Bodea 15h 8.8m UT 11.3 7 59 57.400 28 17 36.13TYC 1938-01455-1 12.4 17.2 38 4.7 2.528 1.128 -5.56 -147.748 28.295 -51.30 -14.44 15.1473 .07234 .19170 4.28564 -1.59799 -0.00566 0.00099 2000 57.966751420071027.00000 72.679522301.308412 15.4775790.208278453.125354472.4744104811.95 0.15 RATE 1.7838369 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.045 0.033 115.6 2.570 0.033 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Oct 23, 22:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org