IOTA/IOTA-ES occultation update for (2154) Underhill / TYC 0005-00782-1 event on 2007 Oct 04, 20:51 UT Visible from SE Asia, India, Africa Summary ------- On 2007 Oct 04 UT, the 21 km diameter asteroid (2154) Underhill will occult a 8.9 mag star in the constellation Pisces for observers along a path across SE Asia, India, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.4 mag to 16.3 mag (the magnitude of the asteroid) for at most 1.7 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: 20 * date and approx. time of event: 2007 Oct 04, 20:42 - 2007 Oct 04, 20:59 UT * magnitude of target star: 8.9 * magnitude drop [mag]: 7.4 * estimated maximum duration [s]: 1.7 * Moon: 34 % sunlit, 114° distance * Sun: 175° distance * rough path description: SE Asia, India, Africa The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 3.38 * 1 sigma uncertainty interval [seconds]: +/- 8.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .082 +/- .064) * 1 sigma uncertainty ellipse (major, minor, PA): ( .089", .053", 60° ) * approx speed of asteroid's shadow [km/s]: 12.4967 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0005-00782-1 by 2154 Underhill on 2007 Oct 04 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 - 52 0 0 - 9 7 33 20 59 55 1 86 5 - 9 1 50 - 9 13 16 - 8 23 9 - 9 51 55 - 51 0 0 - 9 3 21 20 59 55 2 86 4 - 8 57 38 - 9 9 5 - 8 18 56 - 9 47 44 - 50 0 0 - 8 58 56 20 59 54 3 86 3 - 8 53 13 - 9 4 39 - 8 14 31 - 9 43 20 - 49 0 0 - 8 54 17 20 59 54 4 86 2 - 8 48 34 - 9 0 1 - 8 9 51 - 9 38 42 - 48 0 0 - 8 49 25 20 59 53 5 86 1 - 8 43 42 - 8 55 9 - 8 4 58 - 9 33 50 - 47 0 0 - 8 44 20 20 59 52 6 85 0 - 8 38 36 - 8 50 4 - 7 59 52 - 9 28 46 - 46 0 0 - 8 39 1 20 59 52 7 85 -1 - 8 33 18 - 8 44 45 - 7 54 33 - 9 23 28 - 45 0 0 - 8 33 30 20 59 50 8 85 -2 - 8 27 46 - 8 39 13 - 7 49 0 - 9 17 57 - 44 0 0 - 8 27 45 20 59 49 9 85 -3 - 8 22 1 - 8 33 29 - 7 43 14 - 9 12 13 - 43 0 0 - 8 21 47 20 59 48 9 85 -4 - 8 16 3 - 8 27 31 - 7 37 16 - 9 6 17 - 42 0 0 - 8 15 37 20 59 46 10 85 -5 - 8 9 52 - 8 21 21 - 7 31 4 - 9 0 7 - 41 0 0 - 8 9 14 20 59 45 11 84 -6 - 8 3 29 - 8 14 58 - 7 24 40 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17 16 9 15 47 27 131 0 0 16 28 13 20 42 56 1 274 -6 16 33 56 16 22 30 17 12 36 15 43 53 132 0 0 16 24 26 20 42 56 0 274 -6 16 30 9 16 18 43 17 8 49 15 40 5 Data for the target star ------------------------ * name: TYC 0005-00782-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 19 20.6745 DE: +03 41 17.052 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .017 ) * V mag [mag]: 8.9 * B mag [mag]: 10.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2154) Underhill approx. diameter [km]: 21 approx. diameter ["]: .017 distance from Earth [AU]: 1.73400 * orbital information: orbit source: Preston date of fit: 2007 Sep 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 522 number of rejected observations: 8 time covered by the observations: 1958 Apr 08 - 2007 Sep 21 1 sigma uncertainty ellipse (major, minor, PA): 0.088, 0.051, 59° remarks: * orbital elements for (2154) Underhill : Mean anomaly = 259.82960040 deg Arg. of pericenter = 120.62566190 deg Long. of node = 0.97807240 deg Inclination = 7.75530433 deg Eccentricity = 0.12460116 Semimajor axis = 2.63523147 AU Perihelion dist = 2.30687858 AU Mag: H = 12.74, G = 0.15 Epoch of elements : MJD 54377.86900000 TDT (2007 Oct 04.869) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 04 2154 Underhill 20h 51.4m UT 8.9 0 19 20.674 3 41 17.05TYC 0005-00782-1 10.2 16.3 21 1.7 1.734 -2.331 -7.88 -321.183 3.690 -135.67 -4.45 20.8571 -.01389 .06126 -6.88020 -1.55394 0.00051 0.00006 2000 258.0166092007 927.00000120.625662 0.978072 7.7553040.124601162.635231472.3068785812.75 0.15 RATE 2.3039660 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.089 0.053 60.1 4.380 0.056 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 25, 22:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org