IOTA/IOTA-ES occultation update for (704) Interamnia / 2UCAC 38769981 event on 2008 May 03, 01:35 UT Visible from SE USA, Caribbean Summary ------- On 2008 May 03 UT, the 350 km diameter asteroid (704) Interamnia will occult a 12.7 mag star in the constellation Gemini for observers along a path across SE USA, Caribbean. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.5 mag to 12.2 mag (the magnitude of the asteroid) for at most 10.7 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: 98 * date and approx. time of event: 2008 May 03, 01:35 - 2008 May 03, 01:36 UT * midpoint of event [JD]: 2454589.56517083 * magnitude of target star: 12.7 * magnitude drop [mag]: 0.5 * estimated maximum duration [s]: 10.7 * Moon: 9 % sunlit, 90° distance * Sun: 55° distance * rough path description: SE USA, Caribbean The occultation path -------------------- * approximate projected width [km]: 382 * 1 sigma uncertainty interval [path widths]: +/- 0.37 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .051 +/- .050) * 1 sigma uncertainty ellipse (major, minor, PA): ( .051", .050", 91° ) * approx speed of asteroid's shadow [km/s]: 32.7682 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 38769981 by 704 Interamnia on 2008 May 3 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 -103 0 0 33 7 23 1 35 31 49 262 -1 31 15 52 35 0 39 29 54 20 36 25 42 -102 0 0 32 46 7 1 35 34 48 263 -2 30 54 28 34 39 31 29 32 51 36 4 39 -101 0 0 32 24 38 1 35 36 47 264 -3 30 32 51 34 18 8 29 11 9 35 43 23 -100 0 0 32 2 54 1 35 39 47 265 -4 30 11 1 33 56 32 28 49 14 35 21 52 - 99 0 0 31 40 58 1 35 41 46 266 -5 29 48 58 33 34 42 28 27 7 35 0 8 - 98 0 0 31 18 49 1 35 44 45 267 -6 29 26 43 33 12 40 28 4 47 34 38 10 - 97 0 0 30 56 27 1 35 46 44 268 -6 29 4 16 32 50 24 27 42 16 34 16 0 - 96 0 0 30 33 54 1 35 49 43 269 -7 28 41 37 32 27 57 27 19 34 33 53 36 - 95 0 0 30 11 10 1 35 51 42 270 -8 28 18 48 32 5 18 26 56 40 33 31 1 - 94 0 0 29 48 14 1 35 54 42 271 -9 27 55 48 31 42 27 26 33 37 33 8 15 - 93 0 0 29 25 9 1 35 56 41 271 -10 27 32 38 31 19 26 26 10 24 32 45 17 - 92 0 0 29 1 53 1 35 58 40 272 -11 27 9 18 30 56 15 25 47 2 32 22 9 - 91 0 0 28 38 28 1 36 1 39 273 -12 26 45 50 30 32 53 25 23 31 31 58 50 - 90 0 0 28 14 54 1 36 3 38 274 -13 26 22 13 30 9 23 24 59 52 31 35 22 - 89 0 0 27 51 12 1 36 5 37 274 -14 25 58 28 29 45 43 24 36 6 31 11 45 - 88 0 0 27 27 22 1 36 7 36 275 -15 25 34 36 29 21 56 24 12 12 30 47 59 - 87 0 0 27 3 25 1 36 9 35 276 -16 25 10 38 28 58 1 23 48 12 30 24 6 - 86 0 0 26 39 22 1 36 11 34 276 -17 24 46 33 28 33 59 23 24 6 30 0 5 - 85 0 0 26 15 12 1 36 13 33 277 -18 24 22 22 28 9 50 22 59 55 29 35 57 - 84 0 0 25 50 57 1 36 15 32 278 -19 23 58 7 27 45 35 22 35 39 29 11 43 - 83 0 0 25 26 37 1 36 17 31 278 -20 23 33 47 27 21 16 22 11 19 28 47 23 - 82 0 0 25 2 13 1 36 19 30 279 -21 23 9 23 26 56 51 21 46 56 28 22 58 - 81 0 0 24 37 45 1 36 21 30 279 -22 22 44 56 26 32 23 21 22 29 27 58 29 - 80 0 0 24 13 15 1 36 23 29 280 -23 22 20 27 26 7 51 20 58 1 27 33 56 - 79 0 0 23 48 42 1 36 25 28 281 -24 21 55 55 25 43 16 20 33 31 27 9 20 - 78 0 0 23 24 7 1 36 26 27 281 -25 21 31 23 25 18 39 20 8 59 26 44 42 - 77 0 0 22 59 31 1 36 28 26 282 -26 21 6 49 24 54 1 19 44 28 26 20 2 - 76 0 0 22 34 55 1 36 30 25 282 -27 20 42 16 24 29 22 19 19 57 25 55 20 - 75 0 0 22 10 19 1 36 31 24 283 -28 20 17 43 24 4 42 18 55 26 25 30 38 - 74 0 0 21 45 44 1 36 33 23 283 -29 19 53 12 23 40 3 18 30 58 25 5 56 - 73 0 0 21 21 10 1 36 34 22 283 -30 19 28 42 23 15 26 18 6 31 24 41 15 - 72 0 0 20 56 39 1 36 35 21 284 -31 19 4 15 22 50 50 17 42 7 24 16 36 - 71 0 0 20 32 10 1 36 37 20 284 -32 18 39 52 22 26 16 17 17 47 23 51 58 - 70 0 0 20 7 45 1 36 38 19 285 -33 18 15 32 22 1 45 16 53 31 23 27 23 - 69 0 0 19 43 24 1 36 39 18 285 -34 17 51 16 21 37 18 16 29 19 23 2 52 - 68 0 0 19 19 8 1 36 40 17 285 -35 17 27 6 21 12 56 16 5 13 22 38 25 - 67 0 0 18 54 57 1 36 41 16 286 -36 17 3 1 20 48 39 15 41 13 22 14 2 - 66 0 0 18 30 52 1 36 42 14 286 -37 16 39 3 20 24 27 15 17 19 21 49 45 - 65 0 0 18 6 54 1 36 43 13 287 -38 16 15 11 20 0 21 14 53 33 21 25 34 - 64 0 0 17 43 3 1 36 44 12 287 -39 15 51 28 19 36 23 14 29 54 21 1 30 - 63 0 0 17 19 19 1 36 45 11 287 -40 15 27 52 19 12 32 14 6 24 20 37 33 - 62 0 0 16 55 45 1 36 46 10 287 -41 15 4 25 18 48 49 13 43 2 20 13 44 - 61 0 0 16 32 19 1 36 46 9 288 -42 14 41 7 18 25 15 13 19 50 19 50 3 - 60 0 0 16 9 3 1 36 47 8 288 -43 14 17 59 18 1 50 12 56 48 19 26 32 - 59 0 0 15 45 57 1 36 47 7 288 -44 13 55 2 17 38 36 12 33 57 19 3 11 - 58 0 0 15 23 2 1 36 48 6 289 -45 13 32 16 17 15 32 12 11 17 18 40 0 - 57 0 0 15 0 19 1 36 48 5 289 -46 13 9 41 16 52 39 11 48 48 18 16 59 - 56 0 0 14 37 47 1 36 49 4 289 -47 12 47 18 16 29 57 11 26 32 17 54 11 - 55 0 0 14 15 27 1 36 49 3 289 -48 12 25 8 16 7 28 11 4 29 17 31 34 - 54 0 0 13 53 21 1 36 49 2 290 -49 12 3 11 15 45 12 10 42 39 17 9 10 - 53 0 0 13 31 28 1 36 49 1 290 -50 11 41 28 15 23 9 .. .. .. 16 47 0 - 52 0 0 13 9 49 1 36 49 0 290 -51 .. .. .. 15 1 20 .. .. .. 16 25 3 Uncertainty in time = +/- 4 secs [Prediction of 2008 Apr 21.0] Data for the target star ------------------------ * name: 2UCAC 38769981 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 34 44.0773 DE: +19 33 38.532 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .050, .050 ) * V mag [mag]: 12.7 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 98.8060388281 DE(deg): 19.5554735116 * Equation of equinoxes (radians) : 0.000038252241213 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (704) Interamnia approx. diameter [km]: 350 approx. diameter ["]: .137 distance from Earth [AU]: 3.51800 * orbital information: orbit source: Preston date of fit: 2008 Apr 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 2461 number of rejected observations: 127 time covered by the observations: 1910 Oct 09 - 2008 Mar 06 1 sigma uncertainty ellipse (major, minor, PA): 0.008, 0.006, 111° remarks: * orbital elements for (704) Interamnia : Mean anomaly = 81.16501983 deg Arg. of pericenter = 95.77192616 deg Long. of node = 280.38855931 deg Inclination = 17.29203261 deg Eccentricity = 0.15020302 Semimajor axis = 3.06264288 AU Perihelion dist = 2.60262467 AU Mag: H = 6.08, G = -0.02 Epoch of elements : MJD 54589.06700000 TDT (2008 May 03.067) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 3 704 Interamnia 1h 33.8m UT 12.7 6 34 44.077 19 33 38.532UCAC 38769981 0.0 12.2 350 10.7 3.518 3.223 -7.86 -146.1079 19.563 155.76 15.74 1.5641 0.06711 0.39590 18.22620 -3.14340 0.00472 -0.00049 2000 79.4976842008 424.00000 95.771926280.388559 17.2920330.15020302 3.0626429 2.6026247 5.9 5.0-.02 RATE 1.8389060 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.051 0.050 91 1.37 0.050 0 54577.5020080503_769981 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 21, 17:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org