Update for (449) Hamburga - October 9/10, 2001

Update computed by Jan Manek; issued 04 Oct 2000 00:45:00 +0200 (CEST)

Jan Manek's update

                      IOTA/IOTA-ES occultation update for
           (449) Hamburga / TYC 0024-00805-1 on October 9/10, 2001
      visible from N Poland, N Germany, middle England, Ireland in Europe
         South Carolina, Georgia, N Florida and Mexico in North America

Summary

In the night of October 9/10, 2001 a 9.8 mag star TYC 0024-00805-1 will be occulted by a 89 km asteroid (449) Hamburga. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and Tycho-2 star position.

The updated path shows about 2.5 path width north shift with time ~0.3 minutes later compared to Edwin Goffin's nominal prediction.

The path of this occultation runs along Baltic coast of Poland and Germany ~04:01 UT, central England and Ireland ~04:02 UT. After crossing Atlantic Ocean path runs over south Georgia and north Florida ~04:09.5 UT and mid-north Mexico ~4:12 UT.

Within path uncertainties are also S Denmark, N Netherlands, coast of North Carolina, South Carolina, Louisiana with New Orleans and very NW and south Texas. Please check the path chart for details.

This event seems to be promising, give it a try.

The event at one glimpse: * date and approx. UT time of event: October 10, 2001 @ 04:01 UT (Euro) 04:10 UT (USA/Mexico) * magnitude of target star: 9.8 * magnitude drop [mag]: 3.3 * estimated maximum duration [s]: 7.4 * path description: given above * Goffin's original chart reference: A01_1037 The occultation path: * approximate ground width [km]: 105 * uncertainty [path widths]: 1.5 * uncertainty in time [s]: 10 * map: below * remarks: Path uncertainities are given according to nominal star position errors and expected asteroid positional accuracy. !!!!!!! Circles along path indicates the centerline for this event. They are more accurate than the path limit lines. !!!!!!! Data for the target star: * name: TYC 0024-00805-1 * constellation: Pisces * J2000 position [h,m,s; o,',"]: 01h 23m 31.459s; +03o 53' 18.00" * position source: Tycho-2 * estimated accuracy ["]: 0.05" (0.03", 0.04") * V mag [mag]: 9.82 * B-V [mag]: +0.90 * remarks: Target star is in SE Pisces, on border with Cetus, about 2.7 degrees SSW of 4.8 mag star mui Piscium = SAO 109926 or ~1.5 degrees east of 5.2 mag star 89 Piscium = SAO 109793. Close finding chart (prepared in GUIDE7): * occulted star is in center - labeled with cross * field is 3.0x3.0 degrees * limiting magnitude is 12.5 * labeled stars have indicated SAO numbers

Data for the minor planet: * general information: number, name: (449) Hamburga approx. diameter [km]: 89 * orbital information orbit source: calculation Manek source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen) number of used observations: 59 USNO, 6 TMO number of rejected observations: 9 USNO time covered by the observations: 1998 12 23 - 2001 09 29 rms residuals ["] (RA,DE): 0.06", 0.08" estimated positional accuracy at epoch of event ["]: 0.07" remarks: Data for the event: * UT date and time of least geocentric approach: 04:08.2 UT * approx. V mag of minor planet at event [mag]: 13.0 * geocentric parallax of minor planet ["]: 5.291 * magnitude drop [mag]: 3.3 * estimated maximum duration [s]: 7.4 * apparent motion of minor planet ["/h]: 36.09 * angular distance to moon, phase of moon [deg,%]: 86, 50% * remarks: Calculator(s): Jan Manek

Updated path location for (449) Hamburga on October 9/10, 2001

Updated path location for (449) Hamburga on October 9/10, 2001 Path coordinates: Altitude E. Longitude Latitude U.T. star sun ........ shortened .......................... o ' " o ' " h m s o o 26 0 0 54 35 29 4 0 53 7 -6 24 0 0 54 37 10 4 0 54 8 -7 22 0 0 54 37 49 4 0 56 9 -8 20 0 0 54 37 25 4 0 58 10 -9 18 0 0 54 35 58 4 1 1 11 -10 16 0 0 54 33 29 4 1 3 12 -11 14 0 0 54 29 57 4 1 6 13 -13 12 0 0 54 25 22 4 1 9 15 -14 10 0 0 54 19 44 4 1 12 16 -15 8 0 0 54 13 3 4 1 16 17 -16 6 0 0 54 5 19 4 1 20 18 -17 4 0 0 53 56 32 4 1 24 19 -18 2 0 0 53 46 41 4 1 28 20 -20 0 0 0 53 35 46 4 1 33 21 -21 - 2 0 0 53 23 46 4 1 38 23 -22 - 4 0 0 53 10 42 4 1 43 24 -23 - 6 0 0 52 56 34 4 1 49 25 -24 - 8 0 0 52 41 20 4 1 55 26 -26 - 10 0 0 52 25 0 4 2 1 27 -27 - 12 0 0 52 7 35 4 2 7 28 -28 - 14 0 0 51 49 4 4 2 14 30 -29 - 16 0 0 51 29 26 4 2 21 31 -30 ........ shortened .......................... - 70 0 0 36 4 6 4 7 40 57 -60 - 72 0 0 35 18 32 4 7 56 57 -61 - 74 0 0 34 32 36 4 8 12 57 -61 - 76 0 0 33 46 24 4 8 28 57 -61 - 78 0 0 32 59 59 4 8 45 57 -61 - 80 0 0 32 13 25 4 9 1 56 -61 - 82 0 0 31 26 48 4 9 18 56 -61 - 84 0 0 30 40 11 4 9 34 55 -60 - 86 0 0 29 53 40 4 9 51 55 -60 - 88 0 0 29 7 17 4 10 7 54 -59 - 90 0 0 28 21 9 4 10 24 53 -59 - 92 0 0 27 35 20 4 10 40 52 -58 - 94 0 0 26 49 54 4 10 56 51 -57 - 96 0 0 26 4 55 4 11 12 50 -55 - 98 0 0 25 20 28 4 11 28 48 -54 -100 0 0 24 36 38 4 11 43 47 -53 -102 0 0 23 53 27 4 11 59 46 -52 -104 0 0 23 11 2 4 12 13 44 -50 -106 0 0 22 29 25 4 12 28 43 -49 -108 0 0 21 48 40 4 12 42 41 -47 -110 0 0 21 8 52 4 12 56 40 -46 -112 0 0 20 30 4 4 13 9 38 -44 -114 0 0 19 52 19 4 13 22 36 -42 -116 0 0 19 15 40 4 13 34 35 -40 ........ shortened .......................... ---------------------------------------------------------------------------- Jan Manek Stefanik Observatory Private : Petrin 205 Werichova 950 118 46 Praha 1 152 00 Praha 5 - Barrandov |_|_| Czech Republic Czech Republic / \ Internet : jan.manek@worldonline.cz |-O-O-| --------------------------------------------------------------------U---U---

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