IOTA/IOTA-ES occultation update for (3776) Vartiovuori / TYC 7857-00391-1 event on 2024 Oct 11, 10:45 UT Visible from Summary ------- On 2024 Oct 11 UT, the 24.9658470602631 km diameter asteroid (3776) Vartiovuori will occult a 9.1 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.92 mag to 17.02 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: 71 * date and approx. time of event: 2024 Oct 11, 10:42 - 2024 Oct 11, 10:48 * geocentric midpoint of event [JD]: 2460594.94802362 * magnitude of target star: 9.10 * magnitude drop [mag]: 7.92 * estimated maximum duration [s]: 0.750 * Moon: 58 % sunlit, 46° distance * Sun: 56° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 28 * 1 sigma uncertainty interval [path widths]: +/- 0.82 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.002", 123°) * approx speed of asteroid's shadow [km/s]: 33.4697 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7857-00391-1 by 3776 Vartiovuori on 2024 Oct 11 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 - 34 0 0 -12 42 16 10 42 15.2 0 132 40 -12 52 22 -12 32 11 -13 9 4 -12 15 35 .... - 33 0 0 -13 35 8 10 42 15.3 2 131 41 -13 45 18 -13 25 0 -14 2 7 -13 8 18 0.40 - 32 0 0 -14 28 30 10 42 15.5 3 131 42 -14 38 44 -14 18 18 -14 55 38 -14 1 31 0.43 - 31 0 0 -15 22 19 10 42 15.8 4 131 43 -15 32 36 -15 12 4 -15 49 36 -14 55 11 0.44 - 30 0 0 -16 16 33 10 42 16.2 6 131 44 -16 26 53 -16 6 14 -16 43 59 -15 49 16 0.44 - 29 0 0 -17 11 9 10 42 16.7 7 130 45 -17 21 32 -17 0 47 -17 38 43 -16 43 43 0.45 - 28 0 0 -18 6 4 10 42 17.4 8 130 46 -18 16 31 -17 55 39 -18 33 47 -17 38 30 0.45 - 27 0 0 -19 1 17 10 42 18.1 10 130 47 -19 11 46 -18 50 48 -19 29 7 -18 33 34 0.45 - 26 0 0 -19 56 43 10 42 19.0 11 129 47 -20 7 15 -19 46 12 -20 24 41 -19 28 53 0.45 - 25 0 0 -20 52 20 10 42 20.0 12 129 48 -21 2 56 -20 41 46 -21 20 26 -20 24 23 0.45 - 24 0 0 -21 48 6 10 42 21.0 13 129 49 -21 58 44 -21 37 29 -22 16 19 -21 20 2 0.45 - 23 0 0 -22 43 57 10 42 22.2 15 128 49 -22 54 37 -22 33 18 -23 12 16 -22 15 47 0.45 - 22 0 0 -23 39 50 10 42 23.5 16 128 50 -23 50 33 -23 29 9 -24 8 15 -23 11 34 0.45 - 21 0 0 -24 35 42 10 42 24.9 17 127 51 -24 46 27 -24 24 59 -25 4 13 -24 7 21 0.45 - 20 0 0 -25 31 31 10 42 26.3 19 127 51 -25 42 17 -25 20 45 -26 0 6 -25 3 4 0.45 - 19 0 0 -26 27 12 10 42 27.9 20 126 52 -26 38 0 -26 16 25 -26 55 52 -25 58 41 0.45 - 18 0 0 -27 22 43 10 42 29.6 21 126 52 -27 33 33 -27 11 55 -27 51 27 -26 54 8 0.46 - 17 0 0 -28 18 1 10 42 31.3 22 125 52 -28 28 52 -28 7 11 -28 46 48 -27 49 22 0.46 - 16 0 0 -29 13 2 10 42 33.1 24 125 53 -29 23 54 -29 2 11 -29 41 53 -28 44 21 0.46 - 15 0 0 -30 7 44 10 42 35.0 25 124 53 -30 18 37 -29 56 53 -30 36 37 -29 39 1 0.46 - 14 0 0 -31 2 4 10 42 37.0 26 123 53 -31 12 58 -30 51 12 -31 30 58 -30 33 19 0.46 - 13 0 0 -31 55 59 10 42 39.1 27 123 53 -32 6 53 -31 45 6 -32 24 54 -31 27 13 0.46 - 12 0 0 -32 49 26 10 42 41.2 29 122 54 -33 0 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0.48 161 0 0 -38 12 12 10 47 50.2 20 234 -35 -38 23 0 -38 1 24 -38 40 53 -37 43 39 0.48 162 0 0 -37 22 49 10 47 51.6 19 233 -36 -37 33 39 -37 12 0 -37 51 34 -36 54 13 0.48 163 0 0 -36 32 44 10 47 52.9 18 232 -37 -36 43 35 -36 21 55 -37 1 32 -36 4 6 0.48 164 0 0 -35 42 0 10 47 54.2 16 232 -38 -35 52 51 -35 31 9 -36 10 49 -35 13 19 0.49 165 0 0 -34 50 37 10 47 55.4 15 231 -39 -35 1 29 -34 39 46 -35 19 28 -34 21 56 0.49 166 0 0 -33 58 39 10 47 56.5 14 230 -41 -34 9 32 -33 47 48 -34 27 31 -33 29 57 0.49 167 0 0 -33 6 8 10 47 57.5 13 230 -42 -33 17 1 -32 55 17 -33 35 0 -32 37 25 0.50 168 0 0 -32 13 6 10 47 58.5 12 229 -43 -32 23 59 -32 2 15 -32 41 58 -31 44 24 0.50 169 0 0 -31 19 36 10 47 59.3 10 229 -44 -31 30 28 -31 8 45 -31 48 27 -30 50 55 0.51 170 0 0 -30 25 40 10 48 0.1 9 228 -46 -30 36 32 -30 14 50 -30 54 30 -29 57 0 0.51 171 0 0 -29 31 22 10 48 0.8 8 228 -47 -29 42 13 -29 20 33 -30 0 9 -29 2 44 0.52 172 0 0 -28 36 44 10 48 1.4 7 227 -48 -28 47 34 -28 25 56 -29 5 28 -28 8 9 0.54 173 0 0 -27 41 49 10 48 1.9 5 227 -49 -27 52 37 -27 31 2 -28 10 30 -27 13 17 0.56 174 0 0 -26 46 40 10 48 2.2 4 226 -51 -26 57 27 -26 35 54 -27 15 17 -26 18 12 0.59 175 0 0 -25 51 20 10 48 2.5 3 226 -52 -26 2 6 -25 40 36 -26 19 53 -25 22 56 0.65 176 0 0 -24 55 52 10 48 2.7 1 225 -53 -25 6 36 -24 45 10 -25 24 20 -24 27 33 0.81 177 0 0 -24 0 20 10 48 2.8 0 225 -54 -24 11 1 -23 49 39 -24 28 42 .. .. .. 3.19 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 7857-00391-1 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 28 55.0432 DE: -40 25 08.065 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 28 55.0429 DE: -40 25 08.063 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 9.1 * B mag [mag]: 9.5 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3776) Vartiovuori asteroid class: approx. diameter [km]: 25 approx. diameter ["]: 0.010 distance from Earth [AU]: 3.55940 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#51 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): 0.018", 0.002", 123.412° remarks: * orbital elements for (3776)Vartiovuori : Mean anomaly = 65.5858887908 deg Arg. of pericenter = 158.9234847070 deg Long. of node = 39.5811256418 deg Inclination = 27.3853460539 deg Eccentricity = 0.0673991771 Semimajor axis = 3.1855835472 AU Perihelion dist = 2.9708778374 AU Mag: H = 10.95, G = 0.15 Epoch of elements : MJD 60594.44802338 TDT (2024 Oct 11.4480) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512023Apr24,0.75,2024,10,11,10.752567,-0.054246,-0.405698,18.718203,-2.551136,0.004449,-0.001833,-0.000001,0.000000 65.8430,-40.4750,15.37,-7.30,False TYC 7857-00391-1,16.48195650,-40.4189070,9.47,9.10,8.90,0.1,0,,16.50992605,-40.4749999,7.92,7.67,0,0,0 3776,Vartiovuori,17.02,25.224,3.5594,0,0,4.054,-6.30,,1.4,0 0,65.5082,2024,10,11,158.9235,39.5811,27.3853,0.06740,3.18558,2.97088,10.95,5.0,0.15 1.825,0.0180,0.0022,123,0.0080,Known errors,0.84,0,-1,-1 20241011_0391-1,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org