IOTA/IOTA-ES occultation update for (895) Helio / UCAC2 36098962 event on 2012 Dec 12, 11:19 UT Visible from Canada, NW USA, N Australia Summary ------- On 2012 Dec 12 UT, the 128 km diameter asteroid (895) Helio will occult a 11.6 mag star in the constellation Canis Minor for observers along a path across Canada, NW USA, N Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.3 mag to 12.5 mag (the magnitude of the asteroid) for at most 9.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 96 * date and approx. time of event: 2012 Dec 12, 11:12 - 2012 Dec 12, 11:26 UT * geocentric midpoint of event [JD]: 2456273.971925 * magnitude of target star: 11.6 * magnitude drop [mag]: 1.3 * estimated maximum duration [s]: 9.2 * Moon: 1 % sunlit, 138° distance * Sun: 151° distance * rough path description: Canada, NW USA, N Australia The occultation path -------------------- * approximate projected width [km]: 135 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .046 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .047", .028", 100° ) * approx speed of asteroid's shadow [km/s]: 13.9877 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 36098962 by 895 Helio on 2012 Dec 12 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 ' " Longitude Longitude Longitude Longitude 133 54 38 -19 0 0 11 26 46 4 76 -23 131 23 14 136 11 59 ... .. .. 137 56 36 137 25 57 -18 0 0 11 26 43 7 75 -27 135 15 45 139 27 7 133 20 25 141 1 1 Latitude Latitude Latitude Latitude 138 0 0 -17 49 30 11 26 42 8 75 -27 -17 11 8 -18 27 43 -16 39 34 -18 58 57 139 0 0 -17 30 26 11 26 41 9 74 -28 -16 51 57 -18 8 48 -16 20 16 -18 40 8 140 0 0 -17 10 39 11 26 40 10 74 -29 -16 32 1 -17 49 9 -16 0 13 -18 20 36 141 0 0 -16 50 9 11 26 38 11 74 -30 -16 11 22 -17 28 47 -15 39 27 -18 0 21 142 0 0 -16 28 54 11 26 37 12 73 -31 -15 49 58 -17 7 41 -15 17 56 -17 39 23 143 0 0 -16 6 56 11 26 35 13 73 -32 -15 27 51 -16 45 52 -14 55 41 -17 17 41 144 0 0 -15 44 13 11 26 33 14 73 -33 -15 4 59 -16 23 19 -14 32 41 -16 55 15 145 0 0 -15 20 47 11 26 31 15 73 -34 -14 41 22 -16 0 2 -14 8 56 -16 32 6 146 0 0 -14 56 36 11 26 28 16 72 -35 -14 17 1 -15 36 1 -13 44 27 -16 8 13 147 0 0 -14 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58 0 8 59 42 55 57 30 25 - 60 0 0 58 34 32 11 12 39 15 269 -10 59 11 1 57 58 10 59 41 2 57 28 27 - 59 0 0 58 32 14 11 12 38 14 270 -9 59 8 45 57 55 50 59 38 47 57 26 5 - 58 0 0 58 29 33 11 12 37 14 270 -9 59 6 6 57 53 7 59 36 10 57 23 21 - 57 0 0 58 26 30 11 12 36 13 271 -8 59 3 5 57 50 2 59 33 11 57 20 13 - 56 0 0 58 23 4 11 12 35 13 272 -8 58 59 42 57 46 33 59 29 50 57 16 43 - 55 0 0 58 19 15 11 12 34 12 273 -8 58 55 56 57 42 42 59 26 7 57 12 49 - 54 0 0 58 15 4 11 12 33 12 274 -7 58 51 48 57 38 27 59 22 2 57 8 31 - 53 0 0 58 10 29 11 12 32 11 275 -7 58 47 17 57 33 49 59 17 34 57 3 50 - 52 0 0 58 5 31 11 12 31 11 276 -6 58 42 23 57 28 47 59 12 43 56 58 45 - 51 0 0 58 0 9 11 12 30 10 276 -6 58 37 6 57 23 21 59 7 29 56 53 16 - 50 0 0 57 54 24 11 12 29 10 277 -5 58 31 25 57 17 31 59 1 52 56 47 23 - 49 0 0 57 48 15 11 12 29 9 278 -5 58 25 21 57 11 17 58 55 52 56 41 5 - 48 0 0 57 41 42 11 12 28 9 279 -4 58 18 52 57 4 39 58 49 28 56 34 22 - 47 0 0 57 34 44 11 12 27 8 280 -4 58 12 0 56 57 35 58 42 40 56 27 14 - 46 0 0 57 27 21 11 12 27 8 281 -3 58 4 43 56 50 7 58 35 28 56 19 41 - 45 0 0 57 19 33 11 12 26 7 282 -3 57 57 1 56 42 13 58 27 51 56 11 42 - 44 0 0 57 11 20 11 12 25 6 282 -2 57 48 55 56 33 54 58 19 50 56 3 18 - 43 0 0 57 2 41 11 12 25 6 283 -2 57 40 23 56 25 8 58 11 23 55 54 27 - 42 0 0 56 53 36 11 12 24 5 284 -1 57 31 25 56 15 57 58 2 31 55 45 10 - 41 0 0 56 44 5 11 12 24 5 285 -1 57 22 1 56 6 18 57 53 13 55 35 25 - 40 0 0 56 34 7 11 12 24 4 286 0 57 12 10 55 56 12 57 43 29 55 25 13 Uncertainty in time = +/- 5 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: UCAC2 36098962 * constellation : Canis Minor * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 14 14.1319 DE: +12 09 10.751 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .039, .025 ) * V mag [mag]: 11.6 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (895) Helio approx. diameter [km]: 128 approx. diameter ["]: .096 distance from Earth [AU]: 1.84700 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1034 number of rejected observations: 56 time covered by the observations: 1906 Jun 21 - 2012 Nov 28 1 sigma uncertainty ellipse (major, minor, PA): 0.027, 0.014, 121° remarks: * orbital elements for (895) Helio : Mean anomaly = 12.82867765 deg Arg. of pericenter = 178.19216937 deg Long. of node = 264.70456953 deg Inclination = 26.08544904 deg Eccentricity = 0.14707024 Semimajor axis = 3.20266336 AU Perihelion dist = 2.73164688 AU Mag: H = 8.31, G = 0.15 Epoch of elements : MJD 56273.47200000 TDT (2012 Dec 12.472) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 12 895 Helio 11h 19.6m UT 11.6 7 14 14.132 12 9 10.75UCAC2 36098962 0.0 12.5 128 9.2 1.847 -2.004 -23.45 -142.8974 12.160 8.59 -23.12 11.3262 -0.19588 0.24507 -6.17032 -4.92530 -0.00265 0.00128 2000 12.231620201212 9.00000178.192169264.704570 26.0854490.14707024 3.2026634 2.7316469 8.3 5.00.15 RATE 1.7196380 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.047 0.028 100 1.41 0.039 0 0-1 1 056264.0020121212_098962 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 23:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org