IOTA/IOTA-ES occultation update for (2670) Chuvashia / TYC 0815-00362-1 event on 2008 Jan 11, 21:56 UT Visible from Indonesia, Africa Summary ------- On 2008 Jan 11 UT, the 26 km diameter asteroid (2670) Chuvashia will occult a 10.5 mag star in the constellation Cancer for observers along a path across Indonesia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.5 mag to 15.0 mag (the magnitude of the asteroid) for at most 2.5 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: UCAC. The event at a glimpse ---------------------- * Rank: 19 * date and approx. time of event: 2008 Jan 11, 21:46 - 2008 Jan 11, 22:06 UT * magnitude of target star: 10.5 * magnitude drop [mag]: 4.5 * estimated maximum duration [s]: 2.5 * Moon: 13 % sunlit, 164° distance * Sun: 153° distance * rough path description: Indonesia, Africa The occultation path -------------------- * approximate projected width [km]: 26 * 1 sigma uncertainty interval [path widths]: +/- 3.52 * 1 sigma uncertainty interval [seconds]: +/- 10.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .079 +/- .062) * 1 sigma uncertainty ellipse (major, minor, PA): ( .082", .058", 112° ) * approx speed of asteroid's shadow [km/s]: 10.5262 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0815-00362-1 by 2670 Chuvashia 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 - 31 0 0 -14 25 6 22 6 29 1 79 -20 -14 17 48 -14 32 25 .. .. .. -15 23 58 - 30 0 0 -14 14 5 22 6 29 2 79 -21 -14 6 46 -14 21 23 .. .. .. -15 12 57 - 29 0 0 -14 2 59 22 6 29 3 79 -22 -13 55 40 -14 10 18 .. .. .. -15 1 52 - 28 0 0 -13 51 50 22 6 28 4 78 -23 -13 44 31 -13 59 8 -12 53 8 -14 50 43 - 27 0 0 -13 40 37 22 6 27 5 78 -24 -13 33 18 -13 47 55 -12 41 54 -14 39 30 - 26 0 0 -13 29 20 22 6 26 6 78 -24 -13 22 1 -13 36 39 -12 30 38 -14 28 15 - 25 0 0 -13 18 1 22 6 25 7 78 -25 -13 10 42 -13 25 20 -12 19 18 -14 16 56 - 24 0 0 -13 6 39 22 6 24 8 78 -26 -12 59 20 -13 13 58 -12 7 55 -14 5 34 - 23 0 0 -12 55 14 22 6 22 9 77 -27 -12 47 55 -13 2 33 -11 56 29 -13 54 9 - 22 0 0 -12 43 46 22 6 21 10 77 -28 -12 36 27 -12 51 5 -11 45 2 -13 42 42 - 21 0 0 -12 32 16 22 6 19 11 77 -29 -12 24 57 -12 39 36 -11 33 32 -13 31 13 - 20 0 0 -12 20 45 22 6 17 12 77 -30 -12 13 26 -12 28 4 -11 22 0 -13 19 42 - 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3 44 29 - 3 59 2 - 2 53 24 - 4 50 18 137 0 0 - 4 1 15 21 46 52 12 281 12 - 3 53 59 - 4 8 31 - 3 2 52 - 4 59 49 138 0 0 - 4 10 52 21 46 50 11 281 13 - 4 3 36 - 4 18 9 - 3 12 28 - 5 9 27 139 0 0 - 4 20 37 21 46 48 10 281 14 - 4 13 20 - 4 27 54 - 3 22 12 - 5 19 13 140 0 0 - 4 30 29 21 46 46 9 281 15 - 4 23 12 - 4 37 46 - 3 32 3 - 5 29 7 141 0 0 - 4 40 28 21 46 44 8 281 16 - 4 33 12 - 4 47 45 - 3 42 1 - 5 39 8 142 0 0 - 4 50 35 21 46 43 7 281 17 - 4 43 18 - 4 57 52 - 3 52 6 - 5 49 15 143 0 0 - 5 0 48 21 46 42 6 281 18 - 4 53 31 - 5 8 6 - 4 2 19 - 5 59 30 144 0 0 - 5 11 9 21 46 41 5 281 19 - 5 3 51 - 5 18 26 - 4 12 38 - 6 9 51 145 0 0 - 5 21 35 21 46 40 4 281 20 - 5 14 18 - 5 28 53 - 4 23 3 - 6 20 19 146 0 0 - 5 32 9 21 46 39 3 281 21 - 5 24 51 - 5 39 26 .. .. .. - 6 30 54 147 0 0 - 5 42 48 21 46 38 2 281 22 - 5 35 30 - 5 50 6 .. .. .. - 6 41 34 148 0 0 - 5 53 33 21 46 38 1 280 23 - 5 46 15 - 6 0 51 .. .. .. - 6 52 20 149 0 0 - 6 4 24 21 46 38 0 280 24 - 5 57 6 - 6 11 42 .. .. .. - 7 3 12 Data for the target star ------------------------ * name: TYC 0815-00362-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 10 47.5816 DE: +10 16 58.917 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .027 ) * V mag [mag]: 10.5 * B mag [mag]: 11.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2670) Chuvashia approx. diameter [km]: 26 approx. diameter ["]: .018 distance from Earth [AU]: 2.04600 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 683 number of rejected observations: 17 time covered by the observations: 1938 Oct 16 - 2007 Dec 15 1 sigma uncertainty ellipse (major, minor, PA): 0.077, 0.052, 115° remarks: * orbital elements for (2670) Chuvashia : Mean anomaly = 27.27983919 deg Arg. of pericenter = 172.12442937 deg Long. of node = 285.11415559 deg Inclination = 9.84093651 deg Eccentricity = 0.07642608 Semimajor axis = 3.16925934 AU Perihelion dist = 2.92704526 AU Mag: H = 10.94, G = 0.15 Epoch of elements : MJD 54476.91400000 TDT (2008 Jan 11.914) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 11 2670 Chuvashia 21h 56.6m UT 10.5 9 10 47.582 10 16 58.92TYC 0815-00362-1 11.5 15.0 26 2.5 2.046 -1.726 -1.90 57.770 10.283 212.83 -21.79 21.9427 .01366 -.18101 -5.92475 -0.44294 -0.00235 0.00129 2000 26.07203412008 1 5.00000172.124429285.114156 9.8409370.076426083.169259342.9270452610.55 0.15 RATE 1.7468975 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.082 0.058 111.7 4.520 0.062 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 02, 23:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org