IOTA/IOTA-ES occultation update for (6019) 1991 RO6 / HIP 27312 event on 2008 Dec 04, 10:07 UT Visible from S Canada, N USA Summary ------- On 2008 Dec 04 UT, the 18 km diameter asteroid (6019) 1991 RO6 will occult a 7.9 mag star in the constellation Auriga for observers along a path across S Canada, N USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.6 mag to 15.5 mag (the magnitude of the asteroid) for at most 1.5 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: . The event at a glimpse ---------------------- * Rank: 12 * date and approx. time of event: 2008 Dec 04, 09:59 - 2008 Dec 04, 10:15 UT * magnitude of target star: 7.9 * magnitude drop [mag]: 7.6 * estimated maximum duration [s]: 1.5 * Moon: 36 % sunlit, 121° distance * Sun: 164° distance * rough path description: S Canada, N USA The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 5.57 * 1 sigma uncertainty interval [seconds]: +/- 9.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .097 +/- .071) * 1 sigma uncertainty ellipse (major, minor, PA): ( .097", .071", 96° ) * approx speed of asteroid's shadow [km/s]: 11.8657 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 27312 by 6019 1991 RO6 on 2008 Dec 4 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 125 0 0 7 51 52 10 15 50 0 60 -13 7 57 46 7 45 58 9 3 44 .. .. .. 126 0 0 8 26 12 10 15 50 1 60 -15 8 32 6 8 20 17 9 38 13 .. .. .. 127 0 0 9 0 46 10 15 50 2 61 -16 9 6 41 8 54 51 10 12 56 .. .. .. 128 0 0 9 35 34 10 15 49 3 61 -17 9 41 30 9 29 38 10 47 53 .. .. .. 129 0 0 10 10 35 10 15 48 5 61 -18 10 16 32 10 4 38 11 23 2 .. .. .. 130 0 0 10 45 47 10 15 47 6 61 -19 10 51 44 10 39 50 11 58 22 9 33 45 131 0 0 11 21 10 10 15 46 7 61 -20 11 27 8 11 15 12 12 33 53 10 9 0 132 0 0 11 56 41 10 15 44 8 61 -21 12 2 40 11 50 43 13 9 32 10 44 25 133 0 0 12 32 21 10 15 43 9 62 -22 12 38 21 12 26 22 13 45 18 11 19 58 134 0 0 13 8 8 10 15 41 10 62 -24 13 14 8 13 2 9 14 21 12 11 55 39 135 0 0 13 44 1 10 15 39 11 62 -25 13 50 2 13 38 1 14 57 11 12 31 26 136 0 0 14 19 59 10 15 36 13 62 -26 14 26 0 14 13 59 15 33 14 13 7 19 137 0 0 14 56 1 10 15 34 14 63 -27 15 2 2 14 50 0 16 9 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48 - 67 0 0 41 5 14 10 0 26 33 282 -18 41 10 51 40 59 37 42 13 42 39 57 15 - 66 0 0 40 44 25 10 0 21 32 283 -17 40 50 3 40 38 47 41 53 5 39 36 15 - 65 0 0 40 23 8 10 0 17 32 284 -16 40 28 48 40 17 29 41 32 0 39 14 46 - 64 0 0 40 1 24 10 0 13 31 284 -15 40 7 4 39 55 44 41 10 28 38 52 50 - 63 0 0 39 39 12 10 0 8 30 285 -14 39 44 53 39 33 31 40 48 27 38 30 26 - 62 0 0 39 16 31 10 0 4 29 286 -14 39 22 13 39 10 49 40 25 59 38 7 34 - 61 0 0 38 53 23 10 0 0 28 286 -13 38 59 6 38 47 40 40 3 2 37 44 14 - 60 0 0 38 29 46 9 59 56 28 287 -12 38 35 30 38 24 3 39 39 38 37 20 26 - 59 0 0 38 5 42 9 59 52 27 288 -11 38 11 27 37 59 57 39 15 45 36 56 10 - 58 0 0 37 41 10 9 59 48 26 288 -10 37 46 56 37 35 24 38 51 25 36 31 26 - 57 0 0 37 16 9 9 59 44 25 289 -9 37 21 56 37 10 22 38 26 36 36 6 14 - 56 0 0 36 50 41 9 59 41 24 290 -8 36 56 29 36 44 53 38 1 19 35 40 34 - 55 0 0 36 24 45 9 59 37 23 290 -7 36 30 34 36 18 56 37 35 35 35 14 27 - 54 0 0 35 58 21 9 59 34 22 291 -7 36 4 11 35 52 32 37 9 23 34 47 52 - 53 0 0 35 31 30 9 59 30 21 292 -6 35 37 21 35 25 39 36 42 42 34 20 50 - 52 0 0 35 4 11 9 59 27 20 292 -5 35 10 3 34 58 20 36 15 35 33 53 21 - 51 0 0 34 36 26 9 59 24 20 293 -4 34 42 18 34 30 33 35 48 0 33 25 24 - 50 0 0 34 8 13 9 59 21 19 293 -3 34 14 6 34 2 20 35 19 58 32 57 1 - 49 0 0 33 39 34 9 59 18 18 294 -2 33 45 28 33 33 40 34 51 29 32 28 12 - 48 0 0 33 10 28 9 59 15 17 295 -1 33 16 23 33 4 33 34 22 33 31 58 56 Uncertainty in time = +/- 12 secs [Prediction of 2008 Nov 26.0] Data for the target star ------------------------ * name: HIP 27312 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 47 09.9020 DE: +29 25 50.495 * position source: Pos: HIP2, pm: HIP2, pi:HIP2 * standard error: RA,DE ["]: ( .024, .015 ) * V mag [mag]: 7.9 * B mag [mag]: 8.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6019) 1991 RO6 approx. diameter [km]: 18 approx. diameter ["]: .013 distance from Earth [AU]: 1.94700 * orbital information: orbit source: Preston date of fit: 2008 Nov 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 569 number of rejected observations: 17 time covered by the observations: 1954 Jun 30 - 2008 Oct 27 1 sigma uncertainty ellipse (major, minor, PA): 0.094, 0.069, 96° remarks: * orbital elements for (6019) 1991 RO6 : Mean anomaly = 321.92455124 deg Arg. of pericenter = 193.21579169 deg Long. of node = 290.05682750 deg Inclination = 8.58521116 deg Eccentricity = 0.04352830 Semimajor axis = 3.00790490 AU Perihelion dist = 2.87697590 AU Mag: H = 11.45, G = 0.15 Epoch of elements : MJD 54804.42200000 TDT (2008 Dec 04.422) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Dec 4 6019 1991 RO6 10h 7.3m UT 7.9 5 47 9.902 29 25 50.50HIP 27312 8.0 15.5 18 1.5 1.947 -2.285 -5.03 -138.6401 29.432 25.75 -22.31 10.1223 -0.05250 0.31299 -6.60444 -1.11153 -0.00147 -0.00064 2000 321.08908920081130.00000193.215792290.056828 8.5852110.04352830 3.0079049 2.876975911.3 5.00.15 RATE 1.8893310 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.097 0.071 96 6.57 0.071 0 54796.5020081204__27312 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 26, 23:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org