IOTA/IOTA-ES occultation update for (101) Helena / TYC 1404-01567-1 event on 2007 Jul 04, 10:39 UT Visible from Australia Summary ------- On 2007 Jul 04 UT, the 66 km diameter asteroid (101) Helena will occult a 9.7 mag star in the constellation Cancer 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 4.4 mag to 14.1 mag (the magnitude of the asteroid) for at most 1.6 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: 71 * date and approx. time of event: 2007 Jul 04, 10:37 - 2007 Jul 04, 10:42 UT * magnitude of target star: 9.7 * magnitude drop [mag]: 4.4 * estimated maximum duration [s]: 1.6 * Moon: 83 % sunlit, 163° distance * Sun: 31° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 70 * 1 sigma uncertainty interval [path widths]: +/- 0.82 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .019 +/- .020) * 1 sigma uncertainty ellipse (major, minor, PA): ( .020", .019", 4° ) * approx speed of asteroid's shadow [km/s]: 40.8396 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1404-01567-1 by 101 Helena on 2007 Jul 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 - 35 0 0 1 8 48 10 37 40 0 71 31 0 48 34 1 28 59 .. .. .. .. .. .. - 34 0 0 1 29 46 10 37 40 1 71 32 1 9 35 1 49 53 0 36 24 .. .. .. - 33 0 0 1 50 14 10 37 40 2 71 33 1 30 6 2 10 19 0 57 0 .. .. .. - 32 0 0 2 10 13 10 37 40 3 71 34 1 50 8 2 30 14 1 17 6 .. .. .. - 31 0 0 2 29 41 10 37 41 4 71 35 2 9 40 2 49 40 1 36 43 3 22 21 - 30 0 0 2 48 40 10 37 41 5 71 36 2 28 41 3 8 37 1 55 49 3 41 13 - 29 0 0 3 7 9 10 37 41 6 71 37 2 47 13 3 27 2 2 14 25 3 59 34 - 28 0 0 3 25 7 10 37 42 8 71 38 3 5 14 3 44 58 2 32 31 4 17 25 - 27 0 0 3 42 35 10 37 42 9 71 39 3 22 44 4 2 23 2 50 5 4 34 46 - 26 0 0 3 59 32 10 37 43 10 71 40 3 39 43 4 19 17 3 7 9 4 51 36 - 25 0 0 4 15 58 10 37 43 11 71 41 3 56 12 4 35 41 3 23 42 5 7 55 - 24 0 0 4 31 53 10 37 44 12 71 42 4 12 9 4 51 33 3 39 43 5 23 44 - 23 0 0 4 47 16 10 37 44 13 71 43 4 27 36 5 6 55 3 55 13 5 39 1 - 22 0 0 5 2 9 10 37 45 14 71 44 4 42 30 5 21 45 4 10 12 5 53 48 - 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Data for the target star ------------------------ * name: TYC 1404-01567-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 06 28.2504 DE: +19 25 45.207 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .016, .018 ) * V mag [mag]: 9.7 * B mag [mag]: 10.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (101) Helena approx. diameter [km]: 66 approx. diameter ["]: .024 distance from Earth [AU]: 3.76300 * orbital information: orbit source: Preston date of fit: 2007 Jun 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 657 number of rejected observations: 100 time covered by the observations: 1914 Oct 22 - 2007 May 24 1 sigma uncertainty ellipse (major, minor, PA): 0.010, 0.008, 116° remarks: * orbital elements for (101) Helena : Mean anomaly = 169.65221164 deg Arg. of pericenter = 347.80279844 deg Long. of node = 343.46664831 deg Inclination = 10.20039522 deg Eccentricity = 0.14173738 Semimajor axis = 2.58246690 AU Perihelion dist = 2.21643480 AU Mag: H = 8.22, G = 0.35 Epoch of elements : MJD 54285.44400000 TDT (2007 Jul 04.444) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Jul 04 101 Helena 10h 40.1m UT 9.7 9 6 28.250 19 25 45.21TYC 1404-01567-1 10.0 14.1 66 1.6 3.763 3.545 -19.66 54.524 19.434 21.06 22.89 10.6685 -.12694 -.32207 21.46062 -8.41376 0.00286 -0.00063 2000 168.3592962007 629.00000347.802798343.466648 10.2003950.141737382.582466902.216434808.335 0.35 RATE 2.3749360 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.020 0.019 4.1 1.820 0.020 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jun 29, 02:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org