IOTA/IOTA-ES occultation update for (118) Peitho / TYC 5264-00507-1 event on 2007 Sep 02, 02:27 UT Visible from S Africa, Argentina Summary ------- On 2007 Sep 02 UT, the 42 km diameter asteroid (118) Peitho will occult a 12.3 mag star in the constellation Cetus for observers along a path across S Africa, Argentina. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.8 mag to 12.4 mag (the magnitude of the asteroid) for at most 5.0 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: 80 * date and approx. time of event: 2007 Sep 02, 02:15 - 2007 Sep 02, 02:38 UT * magnitude of target star: 12.3 * magnitude drop [mag]: 0.8 * estimated maximum duration [s]: 5.0 * Moon: 72 % sunlit, 47° distance * Sun: 157° distance * rough path description: S Africa, Argentina The occultation path -------------------- * approximate projected width [km]: 46 * 1 sigma uncertainty interval [path widths]: +/- 0.68 * 1 sigma uncertainty interval [seconds]: +/- 4.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .028", 69° ) * approx speed of asteroid's shadow [km/s]: 8.4382 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5264-00507-1 by 118 Peitho on 2007 Sep 02 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 -118 0 0 -48 19 53 2 38 17 0 105 -14 -48 7 2 -48 32 46 -47 49 35 -48 50 19 -117 0 0 -48 30 45 2 38 17 1 104 -14 -48 17 55 -48 43 36 -48 0 30 -49 1 7 -116 0 0 -48 41 15 2 38 17 2 104 -15 -48 28 27 -48 54 5 -48 11 4 -49 11 34 -115 0 0 -48 51 23 2 38 17 3 103 -16 -48 38 36 -49 4 11 -48 21 15 -49 21 38 -114 0 0 -49 1 9 2 38 16 3 102 -16 -48 48 24 -49 13 56 -48 31 5 -49 31 21 -113 0 0 -49 10 34 2 38 15 4 101 -17 -48 57 50 -49 23 20 -48 40 33 -49 40 43 -112 0 0 -49 19 37 2 38 15 5 101 -18 -49 6 55 -49 32 21 -48 49 39 -49 49 43 -111 0 0 -49 28 19 2 38 14 5 100 -18 -49 15 38 -49 41 2 -48 58 24 -49 58 22 -110 0 0 -49 36 40 2 38 13 6 99 -19 -49 24 0 -49 49 22 -49 6 48 -50 6 39 -109 0 0 -49 44 40 2 38 12 7 98 -19 -49 32 0 -49 57 20 -49 14 50 -50 14 36 -108 0 0 -49 52 18 2 38 11 7 98 -20 -49 39 40 -50 4 58 -49 22 31 -50 22 12 -107 0 0 -49 59 36 2 38 9 8 97 -21 -49 46 59 -50 12 15 -49 29 52 -50 29 28 -106 0 0 -50 6 34 2 38 8 9 96 -21 -49 53 58 -50 19 11 -49 36 52 -50 36 23 -105 0 0 -50 13 11 2 38 7 9 95 -22 -50 0 36 -50 25 47 -49 43 31 -50 42 57 -104 0 0 -50 19 27 2 38 5 10 95 -22 -50 6 53 -50 32 2 -49 49 50 -50 49 12 -103 0 0 -50 25 23 2 38 4 10 94 -23 -50 12 50 -50 37 58 -49 55 48 -50 55 6 -102 0 0 -50 30 59 2 38 2 11 93 -24 -50 18 27 -50 43 33 -50 1 26 -51 0 40 -101 0 0 -50 36 15 2 38 0 12 92 -24 -50 23 44 -50 48 48 -50 6 44 -51 5 54 -100 0 0 -50 41 12 2 37 58 12 91 -25 -50 28 41 -50 53 44 -50 11 42 -51 10 48 - 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4 49 52 - 5 16 8 - 4 32 4 - 5 34 3 59 0 0 - 4 42 33 2 16 12 20 261 2 - 4 29 28 - 4 55 40 - 4 11 42 - 5 13 33 60 0 0 - 4 22 32 2 16 7 19 260 3 - 4 9 28 - 4 35 37 - 3 51 44 - 4 53 27 61 0 0 - 4 2 55 2 16 2 18 260 4 - 3 49 53 - 4 15 59 - 3 32 11 - 4 33 47 62 0 0 - 3 43 44 2 15 58 17 260 5 - 3 30 43 - 3 56 46 - 3 13 4 - 4 14 32 63 0 0 - 3 24 59 2 15 53 16 260 6 - 3 12 0 - 3 37 59 - 2 54 22 - 3 55 43 64 0 0 - 3 6 40 2 15 49 15 260 7 - 2 53 42 - 3 19 39 - 2 36 6 - 3 37 20 65 0 0 - 2 48 47 2 15 46 14 260 8 - 2 35 50 - 3 1 44 - 2 18 17 - 3 19 24 66 0 0 - 2 31 20 2 15 42 13 260 9 - 2 18 26 - 2 44 16 - 2 0 54 - 3 1 54 67 0 0 - 2 14 21 2 15 39 12 260 10 - 2 1 28 - 2 27 16 - 1 43 58 - 2 44 51 68 0 0 - 1 57 49 2 15 36 11 260 11 - 1 44 57 - 2 10 42 - 1 27 29 - 2 28 16 69 0 0 - 1 41 44 2 15 33 10 260 13 - 1 28 54 - 1 54 36 - 1 11 28 - 2 12 8 70 0 0 - 1 26 8 2 15 31 9 260 14 - 1 13 18 - 1 38 58 - 0 55 54 - 1 56 28 71 0 0 - 1 10 59 2 15 29 8 260 15 - 0 58 11 - 1 23 48 - 0 40 49 - 1 41 16 72 0 0 - 0 56 18 2 15 27 7 260 16 - 0 43 32 - 1 9 6 - 0 26 11 - 1 26 33 73 0 0 - 0 42 6 2 15 25 6 260 17 - 0 29 21 - 0 54 53 - 0 12 2 - 1 12 18 74 0 0 - 0 28 23 2 15 24 5 260 18 - 0 15 39 - 0 41 8 0 1 38 - 0 58 31 75 0 0 - 0 15 9 2 15 23 4 260 19 - 0 2 26 - 0 27 53 0 14 50 - 0 45 14 76 0 0 - 0 2 24 2 15 22 3 260 20 0 10 18 - 0 15 7 .. .. .. - 0 32 26 77 0 0 0 9 52 2 15 21 2 260 21 0 22 33 - 0 2 50 .. .. .. - 0 20 8 78 0 0 0 21 39 2 15 21 1 260 22 0 34 18 0 8 58 .. .. .. - 0 8 19 Data for the target star ------------------------ * name: TYC 5264-00507-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 13 47.9662 DE: -10 29 58.023 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .020 ) * V mag [mag]: 12.3 * B mag [mag]: 12.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (118) Peitho approx. diameter [km]: 42 approx. diameter ["]: .041 distance from Earth [AU]: 1.41500 * orbital information: orbit source: Preston date of fit: 2007 Aug 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 514 number of rejected observations: 98 time covered by the observations: 1908 Aug 27 - 2007 Aug 12 1 sigma uncertainty ellipse (major, minor, PA): 0.031, 0.020, 61° remarks: * orbital elements for (118) Peitho : Mean anomaly = 287.70603425 deg Arg. of pericenter = 33.65616491 deg Long. of node = 47.74037323 deg Inclination = 7.74310264 deg Eccentricity = 0.16368663 Semimajor axis = 2.43672456 AU Perihelion dist = 2.03786532 AU Mag: H = 8.70, G = 0.15 Epoch of elements : MJD 54345.10200000 TDT (2007 Sep 02.102) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Sep 02 118 Peitho 2h 26.8m UT 12.3 0 13 47.966-10 29 58.02TYC 5264-00507-1 12.4 12.4 42 5.0 1.415 -1.824 -12.41 -14.123 -10.497 143.28 8.09 2.4471 .17267 -.37299 -4.32429 -1.99602 -0.00211 0.00013 2000 286.3840232007 828.00000 33.656165 47.740373 7.7431030.163686632.436724562.037865329.145 0.15 RATE 2.5911610 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.036 0.028 69.3 1.680 0.028 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Aug 28, 23:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org