IOTA/IOTA-ES occultation update for (7536) Fahrenheit / TYC 7397-01049-1 event on 2008 Jul 08, 13:35 UT Visible from Australia Summary ------- On 2008 Jul 08 UT, the 25 km diameter asteroid (7536) Fahrenheit will occult a 10.0 mag star in the constellation Sagittarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.0 mag to 15.0 mag (the magnitude of the asteroid) for at most 2.5 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: 11 * date and approx. time of event: 2008 Jul 08, 13:25 - 2008 Jul 08, 13:47 UT * magnitude of target star: 10.0 * magnitude drop [mag]: 5.0 * estimated maximum duration [s]: 2.5 * Moon: 34 % sunlit, 95° distance * Sun: 164° distance * rough path description: Australia Additional comments ------------------- 3.4" double star The occultation path -------------------- * approximate projected width [km]: 25 * 1 sigma uncertainty interval [path widths]: +/- 6.20 * 1 sigma uncertainty interval [seconds]: +/- 18.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .231 +/- .095) * 1 sigma uncertainty ellipse (major, minor, PA): ( .234", .086", 79° ) * approx speed of asteroid's shadow [km/s]: 9.8268 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7397-01049-1 by 7536 Fahrenheit on 2008 Jul 8 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 75 0 0 23 56 0 13 47 6 6 129 0 24 4 44 23 47 17 25 53 17 21 59 21 76 0 0 23 11 49 13 47 5 7 130 -1 23 20 34 23 3 3 25 9 31 21 14 45 77 0 0 22 27 0 13 47 3 8 130 -2 22 35 47 22 18 12 24 25 5 20 29 33 78 0 0 21 41 34 13 47 1 9 130 -3 21 50 23 21 32 45 23 40 3 19 43 46 79 0 0 20 55 34 13 46 59 10 131 -5 21 4 25 20 46 44 22 54 24 18 57 25 80 0 0 20 9 1 13 46 56 12 131 -6 20 17 53 20 0 9 22 8 10 18 10 32 81 0 0 19 21 55 13 46 53 13 131 -7 19 30 48 19 13 2 21 21 23 17 23 8 82 0 0 18 34 19 13 46 50 14 132 -8 18 43 14 18 25 25 20 34 4 16 35 16 83 0 0 17 46 14 13 46 46 15 132 -9 17 55 10 17 37 19 19 46 15 15 46 55 84 0 0 16 57 43 13 46 43 16 132 -11 17 6 39 16 48 46 18 57 57 14 58 10 85 0 0 16 8 46 13 46 38 18 133 -12 16 17 43 15 59 48 18 9 13 14 9 1 86 0 0 15 19 25 13 46 34 19 133 -13 15 28 24 15 10 27 17 20 4 13 19 29 87 0 0 14 29 43 13 46 29 20 133 -14 14 38 43 14 20 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Uncertainty in time = +/- 25 secs [Prediction of 2008 Jul 2.0] Data for the target star ------------------------ * name: TYC 7397-01049-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 18 14.0865 DE: -32 27 30.099 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .081, .030 ) * V mag [mag]: 10.0 * B mag [mag]: 10.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (7536) Fahrenheit approx. diameter [km]: 25 approx. diameter ["]: .024 distance from Earth [AU]: 1.42800 * orbital information: orbit source: Preston date of fit: 2008 Jul 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 498 number of rejected observations: 6 time covered by the observations: 1978 Mar 05 - 2008 Jun 14 1 sigma uncertainty ellipse (major, minor, PA): 0.220, 0.081, 78° remarks: * orbital elements for (7536) Fahrenheit : Mean anomaly = 346.31401394 deg Arg. of pericenter = 353.69581951 deg Long. of node = 303.88206964 deg Inclination = 12.62379291 deg Eccentricity = 0.15593584 Semimajor axis = 2.84936365 AU Perihelion dist = 2.40504574 AU Mag: H = 11.86, G = 0.15 Epoch of elements : MJD 54655.56600000 TDT (2008 Jul 08.566) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 8 7536 Fahrenheit 13h 36.4m UT 10.0 18 18 14.087-32 27 30.10TYC 7397-01049-1 10.0 15.0 25 2.5 1.428 -2.404 15.50 143.5817 -32.463 -22.81 22.39 13.6066 0.04595 0.09063 -4.94309 2.51589 0.00120 0.00087 2000 345.1734352008 7 3.00000353.695820303.882070 12.6237930.15593584 2.8493637 2.405045711.8 5.00.15 RATE 2.0491900 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.234 0.086 79 7.20 0.150 0 54649.5020080708_1049-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jul 02, 19:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org