IOTA/IOTA-ES occultation update for (3911) Otomo / UCAC4 381-101619 event on 2024 Oct 20, 11:30 UT Visible from Summary ------- On 2024 Oct 20 UT, the 17.4056867793033 km diameter asteroid (3911) Otomo will occult a 11.3 mag star in the constellation Serpens for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.99 mag to 17.30 mag (the magnitude of the asteroid) for at most 0.630 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: 97 * date and approx. time of event: 2024 Oct 20, 11:27 - 2024 Oct 20, 11:34 * geocentric midpoint of event [JD]: 2460603.97972854 * magnitude of target star: 11.31 * magnitude drop [mag]: 5.99 * estimated maximum duration [s]: 0.630 * Moon: 88 % sunlit, 153° distance * Sun: 64° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 0.39 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.002", 85°) * approx speed of asteroid's shadow [km/s]: 30.3287 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 381-101619 by 3911 Otomo on 2024 Oct 20 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 - 22 0 0 -11 45 8 11 27 27.3 1 104 64 -11 50 41 -11 39 34 -11 55 2 -11 35 13 .... - 21 0 0 -12 0 8 11 27 27.4 2 104 65 -12 5 41 -11 54 34 -12 10 3 -11 50 13 0.27 - 20 0 0 -12 15 13 11 27 27.5 3 104 66 -12 20 47 -12 9 40 -12 25 9 -12 5 18 0.28 - 19 0 0 -12 30 25 11 27 27.7 4 103 67 -12 35 59 -12 24 51 -12 40 20 -12 20 29 0.29 - 18 0 0 -12 45 41 11 27 28.0 5 103 68 -12 51 15 -12 40 7 -12 55 37 -12 35 46 0.29 - 17 0 0 -13 1 2 11 27 28.3 6 103 69 -13 6 37 -12 55 28 -13 10 58 -12 51 7 0.29 - 16 0 0 -13 16 28 11 27 28.7 7 103 70 -13 22 2 -13 10 54 -13 26 24 -13 6 32 0.30 - 15 0 0 -13 31 58 11 27 29.2 8 102 71 -13 37 33 -13 26 24 -13 41 55 -13 22 2 0.30 - 14 0 0 -13 47 32 11 27 29.7 9 102 72 -13 53 7 -13 41 58 -13 57 29 -13 37 36 0.30 - 13 0 0 -14 3 9 11 27 30.4 10 102 73 -14 8 44 -13 57 35 -14 13 6 -13 53 13 0.30 - 12 0 0 -14 18 50 11 27 31.0 11 102 74 -14 24 25 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13 37 -21 53 47 0.37 161 0 0 -21 49 7 11 34 9.6 3 256 -51 -21 54 41 -21 43 33 -21 59 3 -21 39 12 0.39 162 0 0 -21 34 27 11 34 9.8 2 256 -52 -21 40 1 -21 28 53 -21 44 22 -21 24 31 0.43 163 0 0 -21 19 40 11 34 9.9 1 256 -53 -21 25 14 -21 14 6 -21 29 36 -21 9 44 0.53 164 0 0 -21 4 47 11 34 9.9 0 255 -53 -21 10 22 -20 59 13 -21 14 44 -20 54 52 2.62 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 381-101619 * constellation : Serpens * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 05 16.9146 DE: -13 50 27.587 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 05 16.9146 DE: -13 50 27.587 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.3 * B mag [mag]: 13.5 * Diameter [mas]: 0.70 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3911) Otomo asteroid class: approx. diameter [km]: 17 approx. diameter ["]: 0.008 distance from Earth [AU]: 3.14230 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#59 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): 0.015", 0.002", 85.095° remarks: * orbital elements for (3911)Otomo : Mean anomaly = 313.7311347651 deg Arg. of pericenter = 134.5116717095 deg Long. of node = 210.2639002592 deg Inclination = 10.7277785734 deg Eccentricity = 0.0940262058 Semimajor axis = 3.0400310493 AU Perihelion dist = 2.7541884641 AU Mag: H = 11.59, G = 0.15 Epoch of elements : MJD 60603.47972825 TDT (2024 Oct 20.4797) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#592023Apr24,0.63,2024,10,20,11.513485,-0.024754,-0.286910,17.057445,-1.443203,0.005216,0.000477,0.000000,0.000000 69.5471,-13.8392,3.48,-10.61,False UCAC4 381-101619,18.08803188,-13.8409964,13.53,11.31,10.11,0.7,0,,18.11125287,-13.8391631,6.00,6.74,0,0,0 3911,Otomo,17.30,19.001,3.1423,0,0,3.278,-4.03,,2.2,0 0,313.6419,2024,10,20,134.5117,210.2639,10.7278,0.09403,3.04003,2.75419,11.59,5.0,0.15 1.391,0.0153,0.0020,85,0.0033,Known errors,0.75,0,-1,-1 20241020_101619,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org