IOTA/IOTA-ES occultation update for (972) Cohnia / 2UCAC 40828215 event on 2012 Dec 16, 08:10 UT Visible from S USA, Mexico, Hawaii Summary ------- On 2012 Dec 16 UT, the 80 km diameter asteroid (972) Cohnia will occult a 12.9 mag star in the constellation Gemini for observers along a path across S USA, Mexico, Hawaii. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 13.2 mag (the magnitude of the asteroid) for at most 6.6 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: 65 * date and approx. time of event: 2012 Dec 16, 08:01 - 2012 Dec 16, 08:18 UT * geocentric midpoint of event [JD]: 2456277.84025 * magnitude of target star: 12.9 * magnitude drop [mag]: 0.9 * estimated maximum duration [s]: 6.6 * Moon: 12 % sunlit, 147° distance * Sun: 171° distance * rough path description: S USA, Mexico, Hawaii The occultation path -------------------- * approximate projected width [km]: 80 * 1 sigma uncertainty interval [path widths]: +/- 0.93 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .045 +/- .059) * 1 sigma uncertainty ellipse (major, minor, PA): ( .059", .045", 1° ) * approx speed of asteroid's shadow [km/s]: 12.0291 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 40828215 by 972 Cohnia on 2012 Dec 16 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 157 0 0 - 4 40 20 8 18 45 1 64 -10 - 4 16 4 - 5 4 35 - 3 30 54 - 5 49 39 158 0 0 - 4 10 36 8 18 45 2 64 -11 - 3 46 19 - 4 34 53 - 3 1 5 - 5 20 1 159 0 0 - 3 40 39 8 18 45 3 64 -12 - 3 16 20 - 4 4 58 - 2 31 2 - 4 50 9 160 0 0 - 3 10 30 8 18 44 4 64 -13 - 2 46 8 - 3 34 50 - 2 0 47 - 4 20 5 161 0 0 - 2 40 8 8 18 43 5 64 -14 - 2 15 45 - 3 4 30 - 1 30 20 - 3 49 48 162 0 0 - 2 9 35 8 18 42 6 64 -15 - 1 45 10 - 2 33 59 - 0 59 43 - 3 19 20 163 0 0 - 1 38 53 8 18 41 7 64 -16 - 1 14 26 - 2 3 18 - 0 28 56 - 2 48 42 164 0 0 - 1 8 0 8 18 40 9 64 -18 - 0 43 32 - 1 32 27 0 2 0 - 2 17 54 165 0 0 - 0 36 59 8 18 38 10 64 -19 - 0 12 30 - 1 1 28 0 33 5 - 1 46 57 166 0 0 - 0 5 51 8 18 36 11 64 -20 0 18 39 - 0 30 20 1 4 17 - 1 15 52 167 0 0 0 25 24 8 18 34 12 64 -21 0 49 56 0 0 54 1 35 35 - 0 44 39 168 0 0 0 56 46 8 18 32 13 64 -22 1 21 18 0 32 14 2 7 0 - 0 13 21 169 0 0 1 28 12 8 18 29 14 64 -23 1 52 46 1 3 40 2 38 29 0 18 4 170 0 0 1 59 43 8 18 27 15 64 -24 2 24 17 1 35 10 3 10 1 0 49 32 171 0 0 2 31 17 8 18 24 16 64 -25 2 55 52 2 6 44 3 41 37 1 21 5 172 0 0 3 2 54 8 18 21 18 64 -27 3 27 29 2 38 20 4 13 16 1 52 40 173 0 0 3 34 32 8 18 18 19 64 -28 3 59 8 3 9 58 4 44 55 2 24 17 174 0 0 4 6 12 8 18 14 20 64 -29 4 30 47 3 41 37 5 16 35 2 55 56 175 0 0 4 37 51 8 18 11 21 64 -30 5 2 26 4 13 16 5 48 14 3 27 34 176 0 0 5 9 29 8 18 7 22 64 -31 5 34 5 4 44 54 6 19 52 3 59 12 177 0 0 5 41 5 8 18 3 23 64 -32 6 5 41 5 16 30 6 51 28 4 30 49 178 0 0 6 12 38 8 17 59 24 64 -33 6 37 14 5 48 4 7 23 1 5 2 23 179 0 0 6 44 8 8 17 55 25 64 -34 7 8 44 6 19 34 7 54 30 5 33 54 180 0 0 7 15 34 8 17 50 26 65 -35 7 40 9 6 51 0 8 25 55 6 5 21 -179 0 0 7 46 54 8 17 45 27 65 -36 8 11 29 7 22 21 8 57 13 6 36 43 -178 0 0 8 18 9 8 17 41 29 65 -38 8 42 42 7 53 36 9 28 26 7 7 59 -177 0 0 8 49 16 8 17 36 30 65 -39 9 13 49 8 24 44 9 59 31 7 39 9 -176 0 0 9 20 16 8 17 30 31 65 -40 9 44 48 8 55 45 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39 8 - 47 0 0 27 27 14 8 2 34 33 285 -23 27 50 5 27 4 24 28 32 37 26 21 57 - 46 0 0 27 9 46 8 2 29 32 285 -22 27 32 40 26 46 53 28 15 17 26 4 21 - 45 0 0 26 51 53 8 2 25 31 286 -22 27 14 50 26 28 57 27 57 32 25 46 20 - 44 0 0 26 33 35 8 2 20 30 286 -21 26 56 34 26 10 36 27 39 22 25 27 53 - 43 0 0 26 14 51 8 2 16 29 287 -20 26 37 53 25 51 49 27 20 47 25 9 1 - 42 0 0 25 55 42 8 2 12 28 287 -19 26 18 47 25 32 37 27 1 46 24 49 44 - 41 0 0 25 36 8 8 2 8 27 288 -18 25 59 16 25 13 0 26 42 21 24 30 1 - 40 0 0 25 16 8 8 2 4 26 288 -17 25 39 20 24 52 57 26 22 30 24 9 53 - 39 0 0 24 55 44 8 2 0 25 288 -16 25 18 58 24 32 30 26 2 14 23 49 20 - 38 0 0 24 34 54 8 1 56 24 289 -15 24 58 12 24 11 37 25 41 33 23 28 21 - 37 0 0 24 13 40 8 1 53 23 289 -14 24 37 0 23 50 20 25 20 28 23 6 58 - 36 0 0 23 52 0 8 1 49 22 290 -13 24 15 24 23 28 37 24 58 57 22 45 10 - 35 0 0 23 29 56 8 1 46 21 290 -12 23 53 23 23 6 30 24 37 2 22 22 57 - 34 0 0 23 7 28 8 1 43 20 291 -11 23 30 58 22 43 59 24 14 42 22 0 20 - 33 0 0 22 44 35 8 1 40 19 291 -10 23 8 8 22 21 3 23 51 58 21 37 18 - 32 0 0 22 21 18 8 1 37 18 291 -9 22 44 54 21 57 43 23 28 50 21 13 52 - 31 0 0 21 57 37 8 1 34 17 292 -8 22 21 16 21 33 58 23 5 17 20 50 3 - 30 0 0 21 33 32 8 1 31 16 292 -7 21 57 14 21 9 51 22 41 21 20 25 49 - 29 0 0 21 9 3 8 1 29 15 292 -6 21 32 48 20 45 19 22 17 1 20 1 12 - 28 0 0 20 44 11 8 1 26 14 293 -5 21 8 0 20 20 24 21 52 18 19 36 12 - 27 0 0 20 18 57 8 1 24 13 293 -4 20 42 48 19 55 6 21 27 12 19 10 48 - 26 0 0 19 53 19 8 1 22 12 293 -3 20 17 13 19 29 26 21 1 43 18 45 2 - 25 0 0 19 27 19 8 1 20 11 294 -2 19 51 16 19 3 23 20 35 51 18 18 54 - 24 0 0 19 0 57 8 1 18 10 294 -1 19 24 57 18 36 58 20 9 37 17 52 24 Uncertainty in time = +/- 6 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: 2UCAC 40828215 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 14 58.6193 DE: +25 58 45.220 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .035, .057 ) * V mag [mag]: 12.9 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (972) Cohnia approx. diameter [km]: 80 approx. diameter ["]: .063 distance from Earth [AU]: 1.74300 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1101 number of rejected observations: 59 time covered by the observations: 1906 Jan 22 - 2012 Nov 01 1 sigma uncertainty ellipse (major, minor, PA): 0.029, 0.014, 100° remarks: * orbital elements for (972) Cohnia : Mean anomaly = 49.73204479 deg Arg. of pericenter = 94.36808357 deg Long. of node = 281.53346783 deg Inclination = 8.36799685 deg Eccentricity = 0.23445246 Semimajor axis = 3.06072932 AU Perihelion dist = 2.34313381 AU Mag: H = 9.54, G = 0.15 Epoch of elements : MJD 56277.34000000 TDT (2012 Dec 16.340) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 16 972 Cohnia 8h 10.0m UT 12.9 6 14 58.619 25 58 45.222UCAC 40828215 0.0 13.2 80 6.6 1.743 -2.496 -6.44 -114.1221 25.981 56.45 -23.33 8.1660 -0.01738 0.09061 -6.66861 -1.27579 -0.00089 -0.00025 2000 48.381022201212 9.00000 94.368084281.533468 8.3679970.23445246 3.0607293 2.3431338 9.5 5.00.15 RATE 1.8406310 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.059 0.045 1 1.93 0.059 0 0 3 0 056264.0020121216_828215 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 10:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org