IOTA/IOTA-ES occultation update for (695) Bella / TYC 4897-01312-1 event on 2008 Apr 01, 20:09 UT Visible from Europe, Africa Summary ------- On 2008 Apr 01 UT, the 48 km diameter asteroid (695) Bella will occult a 10.6 mag star in the constellation Hydra for observers along a path across Europe, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.5 mag to 14.1 mag (the magnitude of the asteroid) for at most 6.8 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: 67 * date and approx. time of event: 2008 Apr 01, 19:56 - 2008 Apr 01, 20:22 UT * magnitude of target star: 10.6 * magnitude drop [mag]: 3.5 * estimated maximum duration [s]: 6.8 * Moon: 22 % sunlit, 157° distance * Sun: 133° distance * rough path description: Europe, Africa The occultation path -------------------- * approximate projected width [km]: 54 * 1 sigma uncertainty interval [path widths]: +/- 0.89 * 1 sigma uncertainty interval [seconds]: +/- 6.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .026", 104° ) * approx speed of asteroid's shadow [km/s]: 7.0652 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4897-01312-1 by 695 Bella on 2008 Apr 1 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 ' " Longitude Longitude Longitude Longitude Latitude Latitude Latitude Latitude - 22 0 0 67 58 15 20 22 44 15 149 0 68 21 32 67 35 5 69 3 21 66 54 12 - 21 0 0 67 30 27 20 22 41 15 150 -1 67 54 3 67 7 1 68 36 23 66 25 37 - 20 0 0 67 1 32 20 22 38 16 151 -1 67 25 25 66 37 48 68 8 18 65 55 54 - 19 0 0 66 31 26 20 22 35 17 152 -2 66 55 37 66 7 24 67 39 2 65 25 0 - 18 0 0 66 0 7 20 22 31 17 153 -2 66 24 35 65 35 48 67 8 33 64 52 54 - 17 0 0 65 27 31 20 22 28 18 154 -3 65 52 18 65 2 55 66 36 48 64 19 31 - 16 0 0 64 53 38 20 22 24 19 154 -3 65 18 42 64 28 45 66 3 45 63 44 51 - 15 0 0 64 18 24 20 22 19 19 155 -4 64 43 46 63 53 14 65 29 21 63 8 51 - 14 0 0 63 41 47 20 22 15 20 156 -5 64 7 26 63 16 20 64 53 33 62 31 28 - 13 0 0 63 3 45 20 22 10 21 157 -5 63 29 40 62 38 1 64 16 18 61 52 41 - 12 0 0 62 24 15 20 22 5 22 158 -6 62 50 27 61 58 16 63 37 35 61 12 28 - 11 0 0 61 43 16 20 21 59 23 159 -7 62 9 44 61 17 1 62 57 21 60 30 46 - 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Uncertainty in time = +/- 7 secs [Prediction of 2008 Mar 28.0] Data for the target star ------------------------ * name: TYC 4897-01312-1 * constellation : Hydra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 36 37.0719 DE: -04 10 59.998 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .020 ) * V mag [mag]: 10.6 * B mag [mag]: 11.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (695) Bella approx. diameter [km]: 48 approx. diameter ["]: .031 distance from Earth [AU]: 2.15900 * orbital information: orbit source: Preston date of fit: 2008 Mar 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 671 number of rejected observations: 63 time covered by the observations: 1913 Oct 25 - 2008 Mar 26 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.018, 116° remarks: * orbital elements for (695) Bella : Mean anomaly = 162.95687167 deg Arg. of pericenter = 79.44059307 deg Long. of node = 275.78800585 deg Inclination = 13.85644291 deg Eccentricity = 0.16030829 Semimajor axis = 2.53918824 AU Perihelion dist = 2.13213532 AU Mag: H = 8.95, G = 0.15 Epoch of elements : MJD 54557.84000000 TDT (2008 Apr 01.840) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 1 695 Bella 20h 10.1m UT 10.6 9 36 37.072- 4 11 0.00TYC 4897-01312-1 11.7 14.1 48 6.8 2.159 -0.706 12.32 11.0761 -4.186 -121.60 4.93 20.1683 0.35842 0.30796 -2.59749 3.02584 0.00423 -0.00019 2000 161.0471162008 325.00000 79.440593275.788006 13.8564430.16030829 2.5391882 2.1321353 9.3 5.00.15 RATE 2.4359130 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.026 104 1.89 0.027 0 54553.5020080401_1312-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 28, 06:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org