IOTA/IOTA-ES occultation update for (4122) Ferrari / TYC 1346-01285-1 event on 2012 Dec 21, 09:23 UT Visible from USA Summary ------- On 2012 Dec 21 UT, the 14 km diameter asteroid (4122) Ferrari will occult a 9.5 mag star in the constellation Gemini for observers along a path across USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.1 mag to 15.6 mag (the magnitude of the asteroid) for at most 1.2 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: 12 * date and approx. time of event: 2012 Dec 21, 09:14 - 2012 Dec 21, 09:31 UT * geocentric midpoint of event [JD]: 2456282.89119167 * magnitude of target star: 9.5 * magnitude drop [mag]: 6.1 * estimated maximum duration [s]: 1.2 * Moon: 61 % sunlit, 97° distance * Sun: 159° distance * rough path description: USA The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 5.52 * 1 sigma uncertainty interval [seconds]: +/- 7.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .079 +/- .061) * 1 sigma uncertainty ellipse (major, minor, PA): ( .081", .059", 106° ) * approx speed of asteroid's shadow [km/s]: 11.8456 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1346-01285-1 by 4122 Ferrari on 2012 Dec 21 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 147 0 0 - 0 7 59 9 31 54 0 75 -19 - 0 3 53 - 0 12 5 0 41 31 .. .. .. 148 0 0 0 8 31 9 31 54 1 75 -20 0 12 37 0 4 24 0 58 5 .. .. .. 149 0 0 0 25 21 9 31 53 2 75 -21 0 29 27 0 21 14 1 14 59 .. .. .. 150 0 0 0 42 31 9 31 53 4 75 -22 0 46 38 0 38 24 1 32 13 .. .. .. 151 0 0 1 0 1 9 31 52 5 75 -23 1 4 9 0 55 54 1 49 48 0 10 27 152 0 0 1 17 51 9 31 51 6 75 -24 1 21 59 1 13 43 2 7 42 0 28 13 153 0 0 1 36 0 9 31 50 7 75 -25 1 40 8 1 31 52 2 25 56 0 46 18 154 0 0 1 54 28 9 31 49 8 75 -26 1 58 37 1 50 20 2 44 28 1 4 42 155 0 0 2 13 15 9 31 47 9 75 -27 2 17 24 2 9 6 3 3 19 1 23 24 156 0 0 2 32 20 9 31 46 10 75 -28 2 36 29 2 28 11 3 22 28 1 42 25 157 0 0 2 51 43 9 31 44 11 75 -29 2 55 53 2 47 33 3 41 55 2 1 44 158 0 0 3 11 23 9 31 42 12 75 -30 3 15 33 3 7 13 4 1 40 2 21 20 159 0 0 3 31 20 9 31 39 13 75 -31 3 35 31 3 27 10 4 21 42 2 41 13 160 0 0 3 51 34 9 31 37 14 75 -32 3 55 45 3 47 24 4 42 0 3 1 23 161 0 0 4 12 4 9 31 35 15 76 -33 4 16 16 4 7 53 5 2 34 3 21 49 162 0 0 4 32 50 9 31 32 16 76 -34 4 37 2 4 28 39 5 23 24 3 42 30 163 0 0 4 53 52 9 31 29 17 76 -35 4 58 3 4 49 40 5 44 30 4 3 28 164 0 0 5 15 8 9 31 26 18 76 -36 5 19 20 5 10 56 6 5 50 4 24 40 165 0 0 5 36 38 9 31 22 19 76 -37 5 40 51 5 32 26 6 27 24 4 46 7 166 0 0 5 58 23 9 31 19 20 76 -38 6 2 36 5 54 10 6 49 13 5 7 47 167 0 0 6 20 21 9 31 15 21 76 -39 6 24 34 6 16 8 7 11 15 5 29 42 168 0 0 6 42 32 9 31 12 22 76 -40 6 46 46 6 38 19 7 33 30 5 51 49 169 0 0 7 4 56 9 31 8 23 77 -41 7 9 9 7 0 42 7 55 57 6 14 9 170 0 0 7 27 31 9 31 3 24 77 -42 7 31 45 7 23 17 8 18 36 6 36 41 171 0 0 7 50 18 9 30 59 25 77 -43 7 54 33 7 46 4 8 41 27 6 59 24 172 0 0 8 13 16 9 30 55 26 77 -44 8 17 31 8 9 2 9 4 28 7 22 19 173 0 0 8 36 25 9 30 50 27 77 -46 8 40 40 8 32 10 9 27 40 7 45 24 174 0 0 8 59 43 9 30 45 28 78 -47 9 3 58 8 55 28 9 51 2 8 8 39 175 0 0 9 23 11 9 30 40 29 78 -48 9 27 26 9 18 55 10 14 32 8 32 4 176 0 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9 16 3 31 265 -20 39 34 21 39 26 25 40 18 19 38 42 40 - 56 0 0 39 26 17 9 16 0 30 265 -19 39 30 15 39 22 18 40 14 14 38 38 32 - 55 0 0 39 21 51 9 15 56 29 266 -19 39 25 50 39 17 52 40 9 50 38 34 4 - 54 0 0 39 17 6 9 15 52 28 267 -18 39 21 5 39 13 7 40 5 7 38 29 18 - 53 0 0 39 12 2 9 15 49 28 267 -17 39 16 1 39 8 3 40 0 5 38 24 12 - 52 0 0 39 6 39 9 15 45 27 268 -16 39 10 38 39 2 40 39 54 43 38 18 46 - 51 0 0 39 0 56 9 15 42 26 269 -16 39 4 55 38 56 57 39 49 3 38 13 1 - 50 0 0 38 54 54 9 15 39 25 269 -15 38 58 54 38 50 55 39 43 3 38 6 57 - 49 0 0 38 48 33 9 15 35 24 270 -14 38 52 32 38 44 33 39 36 44 38 0 33 - 48 0 0 38 41 52 9 15 32 24 271 -13 38 45 52 38 37 52 39 30 6 37 53 50 - 47 0 0 38 34 52 9 15 29 23 271 -13 38 38 52 38 30 52 39 23 8 37 46 47 - 46 0 0 38 27 32 9 15 26 22 272 -12 38 31 32 38 23 31 39 15 51 37 39 24 - 45 0 0 38 19 52 9 15 23 21 273 -11 38 23 53 38 15 52 39 8 15 37 31 42 - 44 0 0 38 11 53 9 15 21 21 273 -10 38 15 54 38 7 53 39 0 19 37 23 40 - 43 0 0 38 3 35 9 15 18 20 274 -10 38 7 36 37 59 34 38 52 3 37 15 18 - 42 0 0 37 54 56 9 15 15 19 275 -9 37 58 58 37 50 55 38 43 28 37 6 37 - 41 0 0 37 45 58 9 15 13 18 275 -8 37 50 0 37 41 57 38 34 34 36 57 35 - 40 0 0 37 36 40 9 15 10 17 276 -7 37 40 42 37 32 39 38 25 19 36 48 14 - 39 0 0 37 27 3 9 15 8 17 276 -6 37 31 5 37 23 1 38 15 45 36 38 33 - 38 0 0 37 17 5 9 15 6 16 277 -6 37 21 8 37 13 3 38 5 51 36 28 32 - 37 0 0 37 6 48 9 15 4 15 278 -5 37 10 51 37 2 45 37 55 38 36 18 11 - 36 0 0 36 56 11 9 15 2 14 278 -4 37 0 14 36 52 8 37 45 4 36 7 30 - 35 0 0 36 45 14 9 15 0 13 279 -3 36 49 17 36 41 10 37 34 11 35 56 29 - 34 0 0 36 33 57 9 14 58 13 279 -2 36 38 0 36 29 53 37 22 58 35 45 8 - 33 0 0 36 22 20 9 14 56 12 280 -2 36 26 24 36 18 16 37 11 25 35 33 27 - 32 0 0 36 10 23 9 14 55 11 281 -1 36 14 27 36 6 18 36 59 32 35 21 26 - 31 0 0 35 58 6 9 14 53 10 281 0 36 2 10 35 54 1 36 47 20 35 9 4 Uncertainty in time = +/- 8 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 1346-01285-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 18 38.8431 DE: +15 00 55.926 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .033, .036 ) * V mag [mag]: 9.5 * B mag [mag]: 10.4 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4122) Ferrari approx. diameter [km]: 14 approx. diameter ["]: .012 distance from Earth [AU]: 1.65600 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 689 number of rejected observations: 9 time covered by the observations: 1954 Oct 24 - 2012 Nov 17 1 sigma uncertainty ellipse (major, minor, PA): 0.074, 0.048, 109° remarks: * orbital elements for (4122) Ferrari : Mean anomaly = 253.73622190 deg Arg. of pericenter = 311.47649818 deg Long. of node = 262.53673990 deg Inclination = 13.45950993 deg Eccentricity = 0.04964262 Semimajor axis = 2.55829932 AU Perihelion dist = 2.43129864 AU Mag: H = 11.84, G = 0.15 Epoch of elements : MJD 56282.39100000 TDT (2012 Dec 21.391) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 21 4122 Ferrari 9h 23.3m UT 9.5 7 18 38.843 15 0 55.93TYC 1346-01285-1 10.4 15.6 14 1.2 1.656 -2.342 -10.53 -121.5209 15.019 38.74 -23.44 9.3886 -0.08701 0.27911 -6.38514 -1.98295 -0.00181 0.00094 2000 253.16030920121219.00000311.476498262.536740 13.4595100.04964262 2.5582993 2.431298611.9 5.00.15 RATE 2.4086690 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.081 0.059 106 6.52 0.064 0 0 1-4 056264.0020121221_1285-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 23:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org