IOTA/IOTA-ES occultation update for (1722) Goffin / TYC 5796-00535-1 event on 2008 Jan 11, 18:07 UT Visible from Spain, France Summary ------- On 2008 Jan 11 UT, the 26 km diameter asteroid (1722) Goffin will occult a 10.2 mag star in the constellation Capricornus for observers along a path across Spain, France. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.5 mag to 17.7 mag (the magnitude of the asteroid) for at most 0.6 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: 29 * date and approx. time of event: 2008 Jan 11, 18:05 - 2008 Jan 11, 18:09 UT * magnitude of target star: 10.2 * magnitude drop [mag]: 7.5 * estimated maximum duration [s]: 0.6 * Moon: 11 % sunlit, 5° distance * Sun: 34° distance * rough path description: Spain, France Additional comments ------------------- low altitude The occultation path -------------------- * approximate projected width [km]: 30 * 1 sigma uncertainty interval [path widths]: +/- 2.29 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .025", 82° ) * approx speed of asteroid's shadow [km/s]: 42.8612 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5796-00535-1 by 1722 Goffin on 2008 Jan 11 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 -141 0 0 13 52 51 18 5 10 1 103 28 13 44 25 14 1 18 .. .. .. 14 40 10 -140 0 0 13 40 0 18 5 10 2 103 29 13 31 34 13 48 26 .. .. .. 14 27 15 -139 0 0 13 27 31 18 5 10 3 104 30 13 19 6 13 35 57 .. .. .. 14 14 42 -138 0 0 13 15 26 18 5 10 4 104 31 13 7 2 13 23 51 .. .. .. 14 2 33 -137 0 0 13 3 44 18 5 10 5 104 32 12 55 20 13 12 8 .. .. .. 13 50 48 -136 0 0 12 52 25 18 5 10 6 104 33 12 44 2 13 0 49 12 5 48 13 39 26 -135 0 0 12 41 30 18 5 11 7 104 34 12 33 8 12 49 54 11 54 57 13 28 27 -134 0 0 12 31 0 18 5 11 8 105 34 12 22 38 12 39 22 11 44 29 13 17 53 -133 0 0 12 20 53 18 5 12 9 105 35 12 12 31 12 29 15 11 34 25 13 7 43 -132 0 0 12 11 10 18 5 12 10 105 36 12 2 49 12 19 31 11 24 46 12 57 57 -131 0 0 12 1 52 18 5 13 11 105 37 11 53 32 12 10 13 11 15 30 12 48 36 -130 0 0 11 52 58 18 5 13 12 106 38 11 44 38 12 1 18 11 6 39 12 39 40 -129 0 0 11 44 29 18 5 14 13 106 39 11 36 10 11 52 49 10 58 13 12 31 8 -128 0 0 11 36 25 18 5 15 14 106 40 11 28 6 11 44 45 10 50 11 12 23 2 -127 0 0 11 28 46 18 5 15 15 106 40 11 20 28 11 37 5 10 42 35 12 15 20 -126 0 0 11 21 32 18 5 16 16 107 41 11 13 14 11 29 51 10 35 23 12 8 4 -125 0 0 11 14 43 18 5 17 17 107 42 11 6 26 11 23 2 10 28 37 12 1 13 -124 0 0 11 8 20 18 5 18 18 107 43 11 0 3 11 16 38 10 22 15 11 54 48 -123 0 0 11 2 22 18 5 19 19 107 43 10 54 5 11 10 40 10 16 19 11 48 48 -122 0 0 10 56 50 18 5 20 20 108 44 10 48 33 11 5 7 10 10 49 11 43 14 -121 0 0 10 51 43 18 5 21 21 108 45 10 43 27 11 0 0 10 5 44 11 38 5 -120 0 0 10 47 2 18 5 22 22 108 46 10 38 46 10 55 19 10 1 4 11 33 23 -119 0 0 10 42 47 18 5 23 22 108 46 10 34 32 10 51 4 9 56 50 11 29 7 -118 0 0 10 38 58 18 5 24 23 109 47 10 30 43 10 47 14 9 53 2 11 25 16 -117 0 0 10 35 35 18 5 25 24 109 48 10 27 20 10 43 51 9 49 40 11 21 52 -116 0 0 10 32 38 18 5 27 25 109 48 10 24 22 10 40 53 9 46 44 11 18 54 -115 0 0 10 30 6 18 5 28 26 110 49 10 21 51 10 38 22 9 44 13 11 16 22 -114 0 0 10 28 1 18 5 29 27 110 50 10 19 47 10 36 17 9 42 9 11 14 16 -113 0 0 10 26 23 18 5 31 28 110 50 10 18 8 10 34 38 9 40 31 11 12 37 -112 0 0 10 25 10 18 5 32 29 111 51 10 16 55 10 33 25 9 39 18 11 11 24 -111 0 0 10 24 24 18 5 34 30 111 52 10 16 9 10 32 39 9 38 32 11 10 37 -110 0 0 10 24 3 18 5 35 31 111 52 10 15 49 10 32 19 9 38 12 11 10 17 -109 0 0 10 24 9 18 5 37 32 112 53 10 15 55 10 32 25 9 38 18 11 10 23 -108 0 0 10 24 42 18 5 38 33 112 53 10 16 27 10 32 57 9 38 50 11 10 56 -107 0 0 10 25 41 18 5 40 34 113 54 10 17 26 10 33 56 9 39 48 11 11 55 -106 0 0 10 27 6 18 5 42 35 113 54 10 18 51 10 35 21 9 41 13 11 13 21 -105 0 0 10 28 57 18 5 43 36 114 54 10 20 42 10 37 13 9 43 3 11 15 13 -104 0 0 10 31 14 18 5 45 36 114 55 10 22 59 10 39 30 9 45 20 11 17 31 -103 0 0 10 33 58 18 5 47 37 115 55 10 25 43 10 42 14 9 48 3 11 20 16 -102 0 0 10 37 8 18 5 49 38 115 55 10 28 53 10 45 25 9 51 12 11 23 27 -101 0 0 10 40 44 18 5 51 39 116 56 10 32 29 10 49 1 9 54 47 11 27 5 -100 0 0 10 44 47 18 5 53 40 116 56 10 36 31 10 53 4 9 58 48 11 31 9 - 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24 0 0 32 33 49 18 8 50 36 220 7 32 24 45 32 42 53 31 43 29 33 24 38 - 23 0 0 32 57 14 18 8 51 35 220 6 32 48 10 33 6 18 32 6 53 33 48 3 - 22 0 0 33 20 33 18 8 53 34 221 5 33 11 30 33 29 38 32 30 13 34 11 23 - 21 0 0 33 43 47 18 8 54 33 222 4 33 34 44 33 52 52 32 53 27 34 34 37 - 20 0 0 34 6 55 18 8 56 32 223 3 33 57 52 34 16 0 33 16 35 34 57 45 - 19 0 0 34 29 56 18 8 57 31 224 2 34 20 53 34 39 0 33 39 37 35 20 45 - 18 0 0 34 52 50 18 8 59 31 224 1 34 43 47 35 1 54 34 2 31 35 43 38 - 17 0 0 35 15 35 18 9 0 30 225 0 35 6 32 35 24 39 34 25 18 36 6 23 - 16 0 0 35 38 13 18 9 2 29 226 -1 35 29 10 35 47 16 34 47 56 36 28 59 - 15 0 0 36 0 41 18 9 3 28 227 -2 35 51 38 36 9 44 35 10 25 36 51 26 - 14 0 0 36 23 0 18 9 4 27 227 -2 36 13 57 36 32 3 35 32 46 37 13 43 - 13 0 0 36 45 9 18 9 5 26 228 -3 36 36 7 36 54 12 35 54 56 37 35 50 - 12 0 0 37 7 7 18 9 6 25 229 -4 36 58 6 37 16 10 36 16 56 37 57 47 - 11 0 0 37 28 55 18 9 8 25 230 -5 37 19 54 37 37 57 36 38 46 38 19 33 - 10 0 0 37 50 32 18 9 9 24 230 -6 37 41 31 37 59 33 37 0 25 38 41 7 - 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Data for the target star ------------------------ * name: TYC 5796-00535-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 46 57.3067 DE: -12 30 35.808 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .020 ) * V mag [mag]: 10.2 * B mag [mag]: 10.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1722) Goffin approx. diameter [km]: 26 approx. diameter ["]: .011 distance from Earth [AU]: 3.31900 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 851 number of rejected observations: 31 time covered by the observations: 1938 Feb 23 - 2007 Dec 05 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.016, 76° remarks: * orbital elements for (1722) Goffin : Mean anomaly = 248.83206982 deg Arg. of pericenter = 285.14332976 deg Long. of node = 168.22042466 deg Inclination = 5.46644799 deg Eccentricity = 0.04925205 Semimajor axis = 2.51339532 AU Perihelion dist = 2.38960544 AU Mag: H = 12.00, G = 0.15 Epoch of elements : MJD 54476.75500000 TDT (2008 Jan 11.755) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 11 1722 Goffin 18h 7.3m UT 10.2 21 46 57.307-12 30 35.81TYC 5796-00535-1 10.5 17.7 26 0.6 3.319 4.188 18.61 304.289 -12.515 270.14 -21.81 18.1213 -.15079 .49571 23.15008 7.02356 0.00307 0.00116 2000 247.1612172008 1 5.00000285.143330168.220425 5.4664480.049252052.513395322.3896054412.35 0.15 RATE 2.4735050 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.029 0.025 81.9 3.290 0.025 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 02, 23:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org