IOTA/IOTA-ES occultation update for (2787) Tovarishch / TYC 7427-00826-1 event on 2024 Oct 30, 11:07 UT Visible from Summary ------- On 2024 Oct 30 UT, the 19.8182274352738 km diameter asteroid (2787) Tovarishch will occult a 8.8 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.83 mag to 17.61 mag (the magnitude of the asteroid) for at most 0.750 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 93 * date and approx. time of event: 2024 Oct 30, 11:04 - 2024 Oct 30, 11:10 * geocentric midpoint of event [JD]: 2460613.96353083 * magnitude of target star: 8.78 * magnitude drop [mag]: 8.83 * estimated maximum duration [s]: 0.750 * Moon: 4 % sunlit, 92° distance * Sun: 69° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 24 * 1 sigma uncertainty interval [path widths]: +/- 0.47 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.004", 79°) * approx speed of asteroid's shadow [km/s]: 26.8356 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7427-00826-1 by 2787 Tovarishch on 2024 Oct 30 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude - 36 0 0 -39 50 48 11 4 7.4 1 133 42 -39 59 38 -39 42 0 -40 7 56 -39 33 45 .... - 35 0 0 -40 34 5 11 4 7.5 2 132 43 -40 42 55 -40 25 17 -40 51 13 -40 17 2 0.57 - 34 0 0 -41 16 56 11 4 7.8 3 131 43 -41 25 45 -41 8 7 -41 34 3 -40 59 52 0.60 - 33 0 0 -41 59 18 11 4 8.0 4 131 44 -42 8 7 -41 50 29 -42 16 25 -41 42 14 0.61 - 32 0 0 -42 41 10 11 4 8.4 5 130 44 -42 49 59 -42 32 22 -42 58 16 -42 24 7 0.61 - 31 0 0 -43 22 30 11 4 8.9 6 129 44 -43 31 19 -43 13 43 -43 39 36 -43 5 29 0.62 - 30 0 0 -44 3 19 11 4 9.4 7 129 45 -44 12 7 -43 54 32 -44 20 23 -43 46 18 0.62 - 29 0 0 -44 43 33 11 4 10.0 8 128 45 -44 52 20 -44 34 47 -45 0 36 -44 26 34 0.62 - 28 0 0 -45 23 12 11 4 10.7 9 127 45 -45 31 59 -45 14 27 -45 40 13 -45 6 15 0.62 - 27 0 0 -46 2 15 11 4 11.5 10 127 46 -46 11 1 -45 53 31 -46 19 14 -45 45 20 0.62 - 26 0 0 -46 40 41 11 4 12.3 11 126 46 -46 49 25 -46 31 58 -46 57 38 -46 23 48 0.63 - 25 0 0 -47 18 29 11 4 13.2 11 125 46 -47 27 12 -47 9 47 -47 35 23 -47 1 39 0.63 - 24 0 0 -47 55 38 11 4 14.1 12 124 46 -48 4 19 -47 46 58 -48 12 30 -47 38 50 0.63 - 23 0 0 -48 32 8 11 4 15.1 13 124 46 -48 40 48 -48 23 29 -48 48 56 -48 15 23 0.63 - 22 0 0 -49 7 57 11 4 16.1 14 123 46 -49 16 36 -48 59 20 -49 24 43 -48 51 16 0.63 - 21 0 0 -49 43 6 11 4 17.2 15 122 46 -49 51 43 -49 34 31 -49 59 48 -49 26 28 0.63 - 20 0 0 -50 17 34 11 4 18.4 16 121 46 -50 26 9 -50 9 1 -50 34 13 -50 1 0 0.63 - 19 0 0 -50 51 21 11 4 19.6 17 120 46 -50 59 54 -50 42 50 -51 7 56 -50 34 51 0.63 - 18 0 0 -51 24 27 11 4 20.8 18 119 46 -51 32 57 -51 15 57 -51 40 57 -51 8 0 0.63 - 17 0 0 -51 56 50 11 4 22.0 18 119 46 -52 5 19 -51 48 23 -52 13 16 -51 40 28 0.63 - 16 0 0 -52 28 32 11 4 23.3 19 118 46 -52 36 58 -52 20 7 -52 44 54 -52 12 14 0.63 - 15 0 0 -52 59 32 11 4 24.6 20 117 46 -53 7 56 -52 51 10 -53 15 50 -52 43 19 0.63 - 14 0 0 -53 29 51 11 4 26.0 21 116 46 -53 38 12 -53 21 31 -53 46 4 -53 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-27 31 51 -27 14 47 -27 39 53 -27 6 49 0.66 162 0 0 -26 36 45 11 10 30.1 22 244 -42 -26 45 15 -26 28 16 -26 53 15 -26 20 20 0.66 163 0 0 -25 50 22 11 10 32.2 21 244 -43 -25 58 50 -25 41 56 -26 6 47 -25 34 1 0.66 164 0 0 -25 4 12 11 10 34.2 20 243 -44 -25 12 38 -24 55 48 -25 20 33 -24 47 56 0.66 165 0 0 -24 18 17 11 10 36.2 18 243 -46 -24 26 40 -24 9 55 -24 34 33 -24 2 5 0.66 166 0 0 -23 32 38 11 10 38.0 17 242 -47 -23 40 59 -23 24 19 -23 48 49 -23 16 31 0.67 167 0 0 -22 47 19 11 10 39.6 16 242 -48 -22 55 37 -22 39 2 -23 3 25 -22 31 16 0.67 168 0 0 -22 2 19 11 10 41.2 15 241 -49 -22 10 35 -21 54 5 -22 18 20 -21 46 22 0.67 169 0 0 -21 17 43 11 10 42.7 14 241 -50 -21 25 55 -21 9 31 -21 33 39 -21 1 50 0.67 170 0 0 -20 33 30 11 10 44.0 13 240 -51 -20 41 40 -20 25 20 -20 49 20 -20 17 42 0.68 171 0 0 -19 49 42 11 10 45.2 11 240 -52 -19 57 50 -19 41 36 -20 5 28 -19 34 0 0.68 172 0 0 -19 6 22 11 10 46.3 10 240 -53 -19 14 27 -18 58 19 -19 22 3 -18 50 46 0.69 173 0 0 -18 23 31 11 10 47.3 9 239 -54 -18 31 33 -18 15 30 -18 39 6 -18 8 0 0.70 174 0 0 -17 41 10 11 10 48.2 8 239 -55 -17 49 9 -17 33 12 -17 56 40 -17 25 44 0.71 175 0 0 -16 59 21 11 10 48.9 7 239 -56 -17 7 17 -16 51 25 -17 14 45 -16 43 59 0.72 176 0 0 -16 18 4 11 10 49.5 6 238 -57 -16 25 57 -16 10 11 -16 33 23 -16 2 48 0.74 177 0 0 -15 37 21 11 10 50.0 4 238 -58 -15 45 12 -15 29 30 -15 52 34 -15 22 10 0.76 178 0 0 -14 57 13 11 10 50.4 3 238 -59 -15 5 1 -14 49 25 -15 12 21 -14 42 7 0.81 179 0 0 -14 17 41 11 10 50.7 2 237 -60 -14 25 26 -14 9 56 -14 32 44 -14 2 41 0.91 180 0 0 -13 38 46 11 10 50.8 1 237 -61 -13 46 28 -13 31 3 -13 53 43 -13 23 51 1.28 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 7427-00826-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 15 57.7209 DE: -32 00 59.428 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 15 57.7208 DE: -32 00 59.428 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 8.8 * B mag [mag]: 9.4 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2787) Tovarishch asteroid class: approx. diameter [km]: 20 approx. diameter ["]: 0.008 distance from Earth [AU]: 3.38870 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 date of fit: 2023 Apr 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.012", 0.004", 79.353° remarks: * orbital elements for (2787)Tovarishch : Mean anomaly = 211.0194610928 deg Arg. of pericenter = 65.6536549600 deg Long. of node = 30.1131000314 deg Inclination = 10.3072832938 deg Eccentricity = 0.0600796837 Semimajor axis = 3.0198064554 AU Perihelion dist = 2.8383774386 AU Mag: H = 11.55, G = 0.15 Epoch of elements : MJD 60613.46353050 TDT (2024 Oct 30.4635) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr24,0.75,2024,10,30,11.124740,0.148832,-0.505879,14.533643,4.265841,0.005561,0.000394,0.000000,0.000000 83.2564,-31.9748,9.04,-14.02,False TYC 7427-00826-1,19.26603363,-32.0165078,9.38,8.78,8.46,0.1,0,,19.29249603,-31.9747894,8.83,8.71,0,0,0 2787,Tovarishch,17.61,20.064,3.3887,0,0,2.964,11.07,,2.0,0 0,210.9324,2024,10,30,65.6537,30.1131,10.3073,0.06008,3.01981,2.83838,11.55,5.0,0.15 1.469,0.0123,0.0037,79,0.0039,Known errors,1.00,0,-1,-1 20241030_0826-1,60140.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org