IOTA/IOTA-ES occultation update for (442) Eichsfeldia / TYC 0042-01295-1 event on 2012 Oct 02, 19:49 UT Visible from SE Asia, Africa Summary ------- On 2012 Oct 02 UT, the 65 km diameter asteroid (442) Eichsfeldia will occult a 11.7 mag star in the constellation Cetus for observers along a path across SE Asia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 13.7 mag (the magnitude of the asteroid) for at most 6.7 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: 91 * date and approx. time of event: 2012 Oct 02, 19:39 - 2012 Oct 02, 20:00 UT * geocentric midpoint of event [JD]: 2456203.32613333 * magnitude of target star: 11.7 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 6.7 * Moon: 93 % sunlit, 12° distance * Sun: 154° distance * rough path description: SE Asia, Africa The occultation path -------------------- * approximate projected width [km]: 65 * 1 sigma uncertainty interval [path widths]: +/- 0.51 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .032 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .032", .029", 82° ) * approx speed of asteroid's shadow [km/s]: 9.6670 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0042-01295-1 by 442 Eichsfeldia on 2012 Oct 2 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 - 3 0 0 -33 18 35 20 0 36 1 84 -22 -33 0 54 -33 36 17 -32 42 52 -33 54 19 - 2 0 0 -33 13 17 20 0 35 2 84 -23 -32 55 35 -33 30 59 -32 37 32 -33 49 3 - 1 0 0 -33 7 31 20 0 35 2 83 -24 -32 49 48 -33 25 14 -32 31 44 -33 43 19 0 0 0 -33 1 17 20 0 35 3 83 -25 -32 43 33 -33 19 2 -32 25 27 -33 37 8 1 0 0 -32 54 36 20 0 34 4 82 -25 -32 36 50 -33 12 21 -32 18 43 -33 30 29 2 0 0 -32 47 26 20 0 33 5 82 -26 -32 29 39 -33 5 13 -32 11 31 -33 23 22 3 0 0 -32 39 49 20 0 32 6 81 -27 -32 22 0 -32 57 37 -32 3 51 -33 15 48 4 0 0 -32 31 43 20 0 31 7 80 -28 -32 13 54 -32 49 34 -31 55 42 -33 7 45 5 0 0 -32 23 10 20 0 30 8 80 -29 -32 5 19 -32 41 2 -31 47 6 -32 59 15 6 0 0 -32 14 9 20 0 29 8 79 -30 -31 56 16 -32 32 2 -31 38 1 -32 50 17 7 0 0 -32 4 40 20 0 27 9 79 -30 -31 46 45 -32 22 35 -31 28 29 -32 40 52 8 0 0 -31 54 42 20 0 25 10 78 -31 -31 36 46 -32 12 39 -31 18 28 -32 30 58 9 0 0 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31 56 19 41 23 41 253 -18 24 50 26 24 13 26 25 9 18 23 54 33 135 0 0 24 49 25 19 41 16 41 254 -17 25 7 52 24 30 57 25 26 42 24 12 7 136 0 0 25 6 25 19 41 9 40 254 -16 25 24 50 24 48 0 25 43 37 24 29 12 137 0 0 25 22 56 19 41 3 39 254 -15 25 41 19 25 4 34 26 0 3 24 45 49 138 0 0 25 38 59 19 40 56 38 255 -14 25 57 19 25 20 39 26 16 1 25 1 57 139 0 0 25 54 34 19 40 50 37 255 -13 26 12 51 25 36 16 26 31 31 25 17 36 140 0 0 26 9 40 19 40 44 36 256 -13 26 27 55 25 51 24 26 46 32 25 32 47 141 0 0 26 24 17 19 40 38 35 256 -12 26 42 30 26 6 4 27 1 5 25 47 29 142 0 0 26 38 26 19 40 32 34 256 -11 26 56 37 26 20 15 27 15 9 26 1 42 143 0 0 26 52 6 19 40 26 33 257 -10 27 10 15 26 33 58 27 28 45 26 15 27 144 0 0 27 5 18 19 40 20 32 257 -9 27 23 24 26 47 11 27 41 52 26 28 43 145 0 0 27 18 1 19 40 15 31 258 -8 27 36 6 26 59 57 27 54 32 26 41 30 146 0 0 27 30 16 19 40 10 31 258 -7 27 48 18 27 12 14 28 6 42 26 53 49 147 0 0 27 42 3 19 40 4 30 259 -6 28 0 3 27 24 2 28 18 25 27 5 40 148 0 0 27 53 21 19 39 59 29 259 -6 28 11 19 27 35 22 28 29 39 27 17 2 149 0 0 28 4 10 19 39 55 28 260 -5 28 22 7 27 46 13 28 40 25 27 27 55 150 0 0 28 14 31 19 39 50 27 260 -4 28 32 26 27 56 36 28 50 43 27 38 20 151 0 0 28 24 24 19 39 45 26 260 -3 28 42 18 28 6 31 29 0 32 27 48 16 152 0 0 28 33 49 19 39 41 25 261 -2 28 51 41 28 15 57 29 9 53 27 57 44 153 0 0 28 42 45 19 39 37 24 261 -1 29 0 35 28 24 55 29 18 47 28 6 43 154 0 0 28 51 13 19 39 33 23 262 -1 29 9 2 28 33 24 29 27 12 28 15 14 Uncertainty in time = +/- 4 secs Prediction of 2012 Sep 27.0 Data for the target star ------------------------ * name: TYC 0042-01295-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 20 22.2374 DE: +04 20 48.772 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .026 ) * V mag [mag]: 11.7 * B mag [mag]: 12.2 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (442) Eichsfeldia approx. diameter [km]: 65 approx. diameter ["]: .057 distance from Earth [AU]: 1.56900 * orbital information: orbit source: Preston date of fit: 2012 Sep 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1078 number of rejected observations: 117 time covered by the observations: 1900 Jul 27 - 2012 Sep 20 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.013, 71° remarks: * orbital elements for (442) Eichsfeldia : Mean anomaly = 163.56763422 deg Arg. of pericenter = 84.13808624 deg Long. of node = 134.99558618 deg Inclination = 6.06475600 deg Eccentricity = 0.07134717 Semimajor axis = 2.34520820 AU Perihelion dist = 2.17788424 AU Mag: H = 9.90, G = 0.15 Epoch of elements : MJD 56202.82600000 TDT (2012 Oct 02.826) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 2 442 Eichsfeldia 19h 49.6m UT 11.7 2 20 22.237 4 20 48.77TYC 0042-01295-1 12.2 13.7 65 6.7 1.569 -1.746 -15.97 85.7528 4.351 -120.13 -3.97 19.8272 0.01556 -0.02841 -4.65394 -2.84816 -0.00247 -0.00001 2000 162.7920942012 930.00000 84.138086134.995586 6.0647560.07134717 2.3452082 2.177884210.0 5.00.15 RATE 2.7443030 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.032 0.029 82 1.51 0.029 0 0 4 2 056197.0020121002_1295-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 26, 21:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org