IOTA/IOTA-ES occultation update for (16943) 1998 HP42 / TYC 2509-00118-1 event on 2010 Feb 17, 18:29 UT Visible from Japan, Russia, Scandanavia Summary ------- On 2010 Feb 17 UT, the 19 km diameter asteroid (16943) 1998 HP42 will occult a 9.1 mag star in the constellation Leo Minor for observers along a path across Japan, Russia, Scandanavia. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.3 mag to 16.4 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: 16 * date and approx. time of event: 2010 Feb 17, 18:21 - 2010 Feb 17, 18:37 UT * magnitude of target star: 9.1 * magnitude drop [mag]: 7.3 * estimated maximum duration [s]: 1.7 * Moon: 12 % sunlit, 125° distance * Sun: 157° distance * rough path description: Japan, Russia, Scandanavia The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 4.18 * 1 sigma uncertainty interval [seconds]: +/- 10.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .114 +/- .075) * 1 sigma uncertainty ellipse (major, minor, PA): ( .119", .067", 111° ) * approx speed of asteroid's shadow [km/s]: 11.3786 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2509-00118-1 by 16943 1998 HP42 on 2010 Feb 17 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 - 22 0 0 53 30 35 18 37 24 19 56 0 53 39 0 53 22 12 54 50 1 52 12 41 - 21 0 0 54 6 24 18 37 21 19 57 -1 54 14 46 53 58 3 55 25 24 52 48 54 - 20 0 0 54 41 19 18 37 17 20 57 -2 54 49 39 54 33 1 55 59 52 53 24 15 - 19 0 0 55 15 21 18 37 14 21 58 -2 55 23 37 55 7 6 56 33 27 53 58 43 - 18 0 0 55 48 30 18 37 11 22 59 -3 55 56 43 55 40 17 57 6 7 54 32 18 - 17 0 0 56 20 46 18 37 8 22 60 -4 56 28 57 56 12 37 57 37 55 55 5 2 - 16 0 0 56 52 11 18 37 4 23 61 -4 57 0 18 56 44 4 58 8 51 55 36 54 - 15 0 0 57 22 44 18 37 1 24 62 -5 57 30 49 57 14 41 58 38 55 56 7 55 - 14 0 0 57 52 28 18 36 58 25 63 -6 58 0 29 57 44 27 59 8 8 56 38 7 - 13 0 0 58 21 22 18 36 54 25 64 -6 58 29 20 58 13 25 59 36 32 57 7 30 - 12 0 0 58 49 27 18 36 51 26 65 -7 58 57 22 58 41 33 60 4 7 57 36 4 - 11 0 0 59 16 44 18 36 47 27 66 -7 59 24 36 59 8 54 60 30 54 58 3 50 - 10 0 0 59 43 15 18 36 44 27 67 -8 59 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Uncertainty in time = +/- 12 secs Prediction of 2010 Feb 4.0 Data for the target star ------------------------ * name: TYC 2509-00118-1 * constellation : Leo Minor * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 10 07 00.2215 DE: +35 07 14.881 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .014, .015 ) * V mag [mag]: 9.1 * B mag [mag]: 9.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (16943) 1998 HP42 approx. diameter [km]: 19 approx. diameter ["]: .016 distance from Earth [AU]: 1.62400 * orbital information: orbit source: Preston date of fit: 2010 Feb 03 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 614 number of rejected observations: 4 time covered by the observations: 1958 Oct 13 - 2010 Jan 12 1 sigma uncertainty ellipse (major, minor, PA): 0.118, 0.065, 111° remarks: * orbital elements for (16943) 1998 HP42 : Mean anomaly = 75.40414110 deg Arg. of pericenter = 339.08650486 deg Long. of node = 69.67749193 deg Inclination = 14.21079337 deg Eccentricity = 0.17729514 Semimajor axis = 2.59761483 AU Perihelion dist = 2.13707034 AU Mag: H = 12.38, G = 0.15 Epoch of elements : MJD 55244.77100000 TDT (2010 Feb 17.771) ------ occelmnt file for Occult BEGIN ----------------------------------- 2010 Feb 17 16943 1998 HP42 18h 29.9m UT 9.1 10 7 0.222 35 7 14.88TYC 2509-00118-1 9.9 16.4 19 1.7 1.624 -2.653 12.24 86.6430 35.118 -93.98 -11.82 18.4987 0.17852 0.47285 -6.01036 2.26336 -0.00006 -0.00231 2000 74.2809562010 213.00000339.086505 69.677492 14.2107930.17729514 2.5976148 2.137070312.7 5.00.15 RATE 2.3541920 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.119 0.067 111 5.18 0.067 0 055231.0020100217_0118-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2010 Feb 03, 18:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org