IOTA/IOTA-ES occultation update for (895) Helio / UCAC2 35371945 event on 2012 Dec 25, 07:34 UT Visible from SE USA, Mexico Summary ------- On 2012 Dec 25 UT, the 128 km diameter asteroid (895) Helio will occult a 11.8 mag star in the constellation Monoceros for observers along a path across SE USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.0 mag to 12.2 mag (the magnitude of the asteroid) for at most 8.4 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: 98 * date and approx. time of event: 2012 Dec 25, 07:28 - 2012 Dec 25, 07:41 UT * geocentric midpoint of event [JD]: 2456286.81590833 * magnitude of target star: 11.8 * magnitude drop [mag]: 1.0 * estimated maximum duration [s]: 8.4 * Moon: 92 % sunlit, 47° distance * Sun: 163° distance * rough path description: SE USA, Mexico The occultation path -------------------- * approximate projected width [km]: 129 * 1 sigma uncertainty interval [path widths]: +/- 0.34 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .037 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .037", .029", 106° ) * approx speed of asteroid's shadow [km/s]: 15.2460 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 35371945 by 895 Helio on 2012 Dec 25 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 171 0 0 -22 8 0 7 41 49 1 79 -5 -21 32 20 -22 43 37 -21 8 3 -23 7 49 172 0 0 -21 56 31 7 41 49 2 78 -6 -21 20 47 -22 32 12 -20 56 28 -22 56 26 173 0 0 -21 44 31 7 41 49 3 78 -7 -21 8 44 -22 20 16 -20 44 21 -22 44 33 174 0 0 -21 32 0 7 41 48 3 78 -8 -20 56 9 -22 7 49 -20 31 44 -22 32 9 175 0 0 -21 18 58 7 41 48 4 77 -9 -20 43 3 -21 54 51 -20 18 35 -22 19 14 176 0 0 -21 5 25 7 41 47 5 77 -10 -20 29 25 -21 41 23 -20 4 55 -22 5 48 177 0 0 -20 51 22 7 41 46 6 77 -11 -20 15 17 -21 27 23 -19 50 43 -21 51 52 178 0 0 -20 36 47 7 41 46 7 76 -12 -20 0 37 -21 12 53 -19 36 0 -21 37 24 179 0 0 -20 21 41 7 41 45 8 76 -13 -19 45 27 -20 57 52 -19 20 47 -21 22 26 180 0 0 -20 6 4 7 41 44 9 76 -14 -19 29 45 -20 42 20 -19 5 2 -21 6 58 -179 0 0 -19 49 56 7 41 42 10 75 -14 -19 13 32 -20 26 17 -18 48 45 -20 50 58 -178 0 0 -19 33 17 7 41 41 11 75 -15 -18 56 48 -20 9 43 -18 31 58 -20 34 28 -177 0 0 -19 16 7 7 41 40 12 75 -16 -18 39 33 -19 52 38 -18 14 40 -20 17 27 -176 0 0 -18 58 27 7 41 38 13 74 -17 -18 21 48 -19 35 3 -17 56 50 -19 59 55 -175 0 0 -18 40 16 7 41 36 14 74 -18 -18 3 31 -19 16 57 -17 38 30 -19 41 53 -174 0 0 -18 21 33 7 41 34 15 74 -19 -17 44 43 -18 58 20 -17 19 38 -19 23 20 -173 0 0 -18 2 21 7 41 32 16 73 -20 -17 25 25 -18 39 13 -17 0 16 -19 4 16 -172 0 0 -17 42 37 7 41 30 17 73 -21 -17 5 36 -18 19 35 -16 40 23 -18 44 42 -171 0 0 -17 22 23 7 41 28 18 73 -22 -16 45 16 -17 59 27 -16 20 0 -18 24 38 -170 0 0 -17 1 39 7 41 26 19 72 -23 -16 24 26 -17 38 49 -15 59 6 -18 4 3 -169 0 0 -16 40 25 7 41 23 20 72 -24 -16 3 6 -17 17 40 -15 37 41 -17 42 59 -168 0 0 -16 18 40 7 41 21 21 72 -25 -15 41 15 -16 56 1 -15 15 47 -17 21 24 -167 0 0 -15 56 25 7 41 18 22 72 -26 -15 18 55 -16 33 53 -14 53 22 -16 59 19 -166 0 0 -15 33 41 7 41 15 23 71 -27 -14 56 4 -16 11 14 -14 30 28 -16 36 45 -165 0 0 -15 10 27 7 41 12 24 71 -28 -14 32 44 -15 48 6 -14 7 3 -16 13 41 -164 0 0 -14 46 43 7 41 9 25 71 -29 -14 8 55 -15 24 29 -13 43 10 -15 50 8 -163 0 0 -14 22 31 7 41 5 26 71 -30 -13 44 36 -15 0 22 -13 18 47 -15 26 5 -162 0 0 -13 57 49 7 41 2 27 71 -31 -13 19 48 -14 35 47 -12 53 55 -15 1 34 -161 0 0 -13 32 39 7 40 58 28 70 -32 -12 54 32 -14 10 43 -12 28 35 -14 36 34 -160 0 0 -13 7 1 7 40 55 29 70 -33 -12 28 47 -13 45 10 -12 2 46 -14 11 6 -159 0 0 -12 40 54 7 40 51 30 70 -34 -12 2 35 -13 19 10 -11 36 29 -13 45 10 -158 0 0 -12 14 20 7 40 47 31 70 -35 -11 35 54 -12 52 42 -11 9 44 -13 18 45 -157 0 0 -11 47 18 7 40 43 33 70 -36 -11 8 46 -12 25 46 -10 42 32 -12 51 54 -156 0 0 -11 19 49 7 40 38 34 70 -37 -10 41 12 -11 58 24 -10 14 53 -12 24 36 -155 0 0 -10 51 54 7 40 34 35 69 -38 -10 13 11 -11 30 35 - 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25 0 0 39 13 1 7 28 20 18 269 -17 39 47 57 38 38 8 40 11 44 38 14 26 - 24 0 0 39 11 44 7 28 18 17 270 -16 39 46 40 38 36 50 40 10 27 38 13 7 - 23 0 0 39 10 0 7 28 17 16 270 -15 39 44 57 38 35 6 40 8 45 38 11 23 - 22 0 0 39 7 51 7 28 15 15 271 -14 39 42 49 38 32 56 40 6 37 38 9 13 - 21 0 0 39 5 17 7 28 14 15 271 -14 39 40 16 38 30 20 40 4 5 38 6 36 - 20 0 0 39 2 16 7 28 12 14 272 -13 39 37 17 38 27 19 40 1 6 38 3 34 - 19 0 0 38 58 51 7 28 11 13 273 -12 39 33 52 38 23 52 39 57 43 38 0 6 - 18 0 0 38 54 59 7 28 10 12 273 -11 39 30 2 38 19 58 39 53 53 37 56 12 - 17 0 0 38 50 41 7 28 9 11 274 -11 39 25 46 38 15 39 39 49 39 37 51 51 - 16 0 0 38 45 57 7 28 8 11 275 -10 39 21 4 38 10 53 39 44 58 37 47 4 - 15 0 0 38 40 48 7 28 7 10 275 -9 39 15 56 38 5 42 39 39 52 37 41 51 - 14 0 0 38 35 12 7 28 6 9 276 -8 39 10 23 38 0 4 39 34 20 37 36 11 - 13 0 0 38 29 10 7 28 5 8 276 -8 39 4 23 37 53 59 39 28 22 37 30 5 - 12 0 0 38 22 41 7 28 4 8 277 -7 38 57 57 37 47 28 39 21 57 37 23 32 - 11 0 0 38 15 46 7 28 3 7 278 -6 38 51 4 37 40 30 39 15 7 37 16 32 - 10 0 0 38 8 24 7 28 2 6 278 -5 38 43 46 37 33 5 39 7 50 37 9 6 - 9 0 0 38 0 35 7 28 2 5 279 -5 38 36 0 37 25 14 39 0 7 37 1 12 - 8 0 0 37 52 20 7 28 1 4 280 -4 38 27 48 37 16 55 38 51 57 36 52 51 - 7 0 0 37 43 38 7 28 1 4 280 -3 38 19 9 37 8 9 38 43 20 36 44 3 - 6 0 0 37 34 28 7 28 1 3 281 -2 38 10 3 36 58 56 38 34 16 36 34 47 - 5 0 0 37 24 51 7 28 0 2 281 -2 38 0 30 36 49 15 38 24 46 36 25 4 - 4 0 0 37 14 46 7 28 0 1 282 -1 37 50 29 36 39 7 38 14 48 36 14 53 Uncertainty in time = +/- 3 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: UCAC2 35371945 * constellation : Monoceros * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 02 34.6737 DE: +10 14 15.636 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .026, .025 ) * V mag [mag]: 11.8 * 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 ["]: .098 distance from Earth [AU]: 1.79900 * orbital information: orbit source: Preston date of fit: 2012 Nov 30 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): 0.028, 0.015, 120° remarks: * orbital elements for (895) Helio : Mean anomaly = 15.04732594 deg Arg. of pericenter = 178.18089537 deg Long. of node = 264.70480699 deg Inclination = 26.08579049 deg Eccentricity = 0.14701778 Semimajor axis = 3.20244748 AU Perihelion dist = 2.73163077 AU Mag: H = 8.31, G = 0.15 Epoch of elements : MJD 56286.31600000 TDT (2012 Dec 25.316) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 25 895 Helio 7h 34.9m UT 11.8 7 2 34.674 10 14 15.64UCAC2 35371945 0.0 12.2 128 8.4 1.799 -2.469 -21.03 -102.3048 10.244 66.33 -23.38 7.5818 -0.06535 0.11303 -7.45231 -4.30274 -0.00107 0.00137 2000 13.96109320121219.00000178.180895264.704807 26.0857900.14701778 3.2024475 2.7316308 8.3 5.00.15 RATE 1.7198120 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.037 0.029 106 1.34 0.033 0 0-3-4 056264.0020121225_371945 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 30, 00:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org