IOTA/IOTA-ES occultation update for (407) Arachne / UCAC4 603-026747 event on 2023 Nov 25, 19:23 UT Visible from Russia, Europe Summary ------- On 2023 Nov 25 UT, the 94.1 km diameter asteroid (407) Arachne will occult a 12.4 mag star in the constellation Auriga for observers along a path across Russia, Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.01 mag to 12.82 mag (the magnitude of the asteroid) for at most 10.430 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: 100 * date and approx. time of event: 2023 Nov 25, 19:13 - 2023 Nov 25, 19:33 * geocentric midpoint of event [JD]: 2460274.30794734 * magnitude of target star: 12.36 * magnitude drop [mag]: 1.01 * estimated maximum duration [s]: 10.430 * Moon: 97 % sunlit, 45° distance * Sun: 154° distance * rough path description: Russia, Europe The occultation path -------------------- * approximate projected width [km]: 118 * 1 sigma uncertainty interval [path widths]: +/- 0.04 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.001", 96°) * approx speed of asteroid's shadow [km/s]: 9.0240 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 603-026747 by 407 Arachne on 2023 Nov 25 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 - 16 0 0 26 15 15 19 32 49.6 0 56 -18 26 53 38 .. .. .. 26 56 22 .. .. .. .... - 15 0 0 26 52 25 19 32 49.4 1 56 -19 27 30 58 26 14 15 27 33 43 26 11 33 -0.58 - 14 0 0 27 29 51 19 32 48.9 2 57 -20 28 8 33 26 51 32 28 11 19 26 48 50 -0.65 - 13 0 0 28 7 32 19 32 48.0 3 57 -21 28 46 23 27 29 4 28 49 10 27 26 21 -0.68 - 12 0 0 28 45 26 19 32 46.9 4 58 -22 29 24 27 28 6 49 29 27 14 28 4 6 -0.69 - 11 0 0 29 23 32 19 32 45.4 5 58 -23 30 2 41 28 44 47 30 5 29 28 42 2 -0.70 - 10 0 0 30 1 48 19 32 43.6 7 59 -24 30 41 6 29 22 54 30 43 54 29 20 9 -0.70 - 9 0 0 30 40 13 19 32 41.6 8 59 -25 31 19 39 30 1 11 31 22 28 29 58 25 -0.70 - 8 0 0 31 18 45 19 32 39.2 9 60 -26 31 58 20 30 39 35 32 1 10 30 36 49 -0.71 - 7 0 0 31 57 23 19 32 36.6 10 60 -27 32 37 7 31 18 5 32 39 57 31 15 19 -0.71 - 6 0 0 32 36 6 19 32 33.6 11 61 -28 33 15 57 31 56 41 33 18 48 31 53 54 -0.71 - 5 0 0 33 14 52 19 32 30.4 12 61 -29 33 54 51 32 35 19 33 57 42 32 32 32 -0.71 - 4 0 0 33 53 40 19 32 26.9 13 62 -30 34 33 46 33 14 0 34 36 37 33 11 12 -0.72 - 3 0 0 34 32 27 19 32 23.2 14 62 -30 35 12 40 33 52 40 35 15 33 33 49 52 -0.72 - 2 0 0 35 11 13 19 32 19.2 15 63 -31 35 51 33 34 31 20 35 54 26 34 28 31 -0.72 - 1 0 0 35 49 57 19 32 14.9 16 64 -32 36 30 23 35 9 57 36 33 16 35 7 8 -0.72 0 0 0 36 28 36 19 32 10.4 17 64 -33 37 9 8 35 48 30 37 12 2 35 45 41 -0.72 1 0 0 37 7 9 19 32 5.7 18 65 -34 37 47 47 36 26 58 37 50 41 36 24 8 -0.72 2 0 0 37 45 35 19 32 0.8 19 66 -35 38 26 18 37 5 19 38 29 13 37 2 29 -0.72 3 0 0 38 23 52 19 31 55.6 20 66 -35 39 4 41 37 43 32 39 7 36 37 40 41 -0.72 4 0 0 39 2 0 19 31 50.3 21 67 -36 39 42 53 38 21 35 39 45 48 38 18 44 -0.72 5 0 0 39 39 56 19 31 44.7 22 68 -37 40 20 53 38 59 27 40 23 49 38 56 36 -0.73 6 0 0 40 17 40 19 31 39.0 23 69 -37 40 58 41 39 37 7 41 1 37 39 34 15 -0.73 7 0 0 40 55 9 19 31 33.1 24 69 -38 41 36 14 40 14 33 41 39 10 40 11 41 -0.73 8 0 0 41 32 24 19 31 27.0 24 70 -39 42 13 31 40 51 45 42 16 28 40 48 53 -0.73 9 0 0 42 9 22 19 31 20.7 25 71 -40 42 50 32 41 28 41 42 53 28 41 25 48 -0.73 10 0 0 42 46 2 19 31 14.4 26 72 -40 43 27 15 42 5 19 43 30 11 42 2 27 -0.73 11 0 0 43 22 24 19 31 7.9 27 73 -41 44 3 38 42 41 40 44 6 35 42 38 47 -0.73 12 0 0 43 58 27 19 31 1.2 28 73 -41 44 39 42 43 17 41 44 42 38 43 14 48 -0.73 13 0 0 44 34 8 19 30 54.4 29 74 -42 45 15 24 43 53 21 45 18 20 43 50 29 -0.73 14 0 0 45 9 27 19 30 47.6 30 75 -42 45 50 43 44 28 40 45 53 40 44 25 48 -0.73 15 0 0 45 44 24 19 30 40.6 30 76 -43 46 25 40 45 3 37 46 28 36 45 0 45 -0.73 16 0 0 46 18 57 19 30 33.6 31 77 -43 47 0 12 45 38 11 47 3 9 45 35 18 -0.74 17 0 0 46 53 5 19 30 26.4 32 78 -44 47 34 19 46 12 20 47 37 16 46 9 28 -0.74 18 0 0 47 26 48 19 30 19.2 33 79 -44 48 8 1 46 46 5 48 10 58 46 43 13 -0.74 19 0 0 48 0 5 19 30 12.0 33 80 -45 48 41 16 47 19 24 48 44 12 47 16 32 -0.74 20 0 0 48 32 56 19 30 4.6 34 81 -45 49 14 4 47 52 17 49 17 0 47 49 25 -0.74 21 0 0 49 5 19 19 29 57.3 35 82 -46 49 46 24 48 24 42 49 49 20 48 21 51 -0.74 22 0 0 49 37 14 19 29 49.9 36 83 -46 50 18 16 48 56 41 50 21 11 48 53 49 -0.74 23 0 0 50 8 40 19 29 42.4 36 84 -46 50 49 38 49 28 11 50 52 34 49 25 19 -0.74 24 0 0 50 39 38 19 29 35.0 37 85 -47 51 20 32 49 59 12 51 23 27 49 56 21 -0.74 25 0 0 51 10 6 19 29 27.5 38 86 -47 51 50 55 50 29 45 51 53 50 50 26 54 -0.74 26 0 0 51 40 4 19 29 20.0 38 87 -47 52 20 48 50 59 48 52 23 43 50 56 57 -0.74 27 0 0 52 9 32 19 29 12.5 39 89 -47 52 50 11 51 29 21 52 53 5 51 26 31 -0.74 28 0 0 52 38 30 19 29 5.0 39 90 -48 53 19 3 51 58 24 53 21 57 51 55 35 -0.74 29 0 0 53 6 57 19 28 57.5 40 91 -48 53 47 24 52 26 57 53 50 17 52 24 8 -0.75 30 0 0 53 34 53 19 28 50.1 41 92 -48 54 15 14 52 55 0 54 18 7 52 52 11 -0.75 31 0 0 54 2 18 19 28 42.6 41 93 -48 54 42 32 53 22 32 54 45 25 53 19 43 -0.75 32 0 0 54 29 13 19 28 35.2 42 94 -48 55 9 20 53 49 33 55 12 12 53 46 45 -0.75 33 0 0 54 55 36 19 28 27.8 42 96 -48 55 35 35 54 16 3 55 38 27 54 13 16 -0.75 34 0 0 55 21 28 19 28 20.4 43 97 -49 56 1 20 54 42 3 56 4 11 54 39 16 -0.75 35 0 0 55 46 49 19 28 13.1 43 98 -49 56 26 33 55 7 31 56 29 23 55 4 45 -0.75 36 0 0 56 11 39 19 28 5.8 44 99 -49 56 51 15 55 32 29 56 54 4 55 29 43 -0.75 37 0 0 56 35 57 19 27 58.5 44 101 -49 57 15 25 55 56 56 57 18 14 55 54 11 -0.75 38 0 0 56 59 46 19 27 51.3 44 102 -49 57 39 5 56 20 52 57 41 53 56 18 8 -0.75 39 0 0 57 23 3 19 27 44.2 45 103 -49 58 2 13 56 44 18 58 5 1 56 41 34 -0.75 40 0 0 57 45 50 19 27 37.1 45 105 -49 58 24 51 57 7 14 58 27 38 57 4 30 -0.75 41 0 1 58 8 6 19 27 30.0 46 106 -49 58 46 59 57 29 39 58 49 45 57 26 56 -0.75 42 0 1 58 29 53 19 27 23.0 46 107 -49 59 8 36 57 51 34 59 11 22 57 48 52 -0.75 43 0 1 58 51 9 19 27 16.1 46 109 -49 59 29 43 58 13 0 59 32 28 58 10 19 -0.75 44 0 1 59 11 56 19 27 9.2 47 110 -49 59 50 21 58 33 56 59 53 5 58 31 15 -0.75 45 0 1 59 32 14 19 27 2.4 47 111 -49 60 10 29 58 54 23 60 13 13 58 51 43 -0.76 46 0 1 59 52 3 19 26 55.6 47 113 -49 60 30 8 59 14 22 60 32 51 59 11 42 -0.76 47 0 1 60 11 23 19 26 48.9 48 114 -49 60 49 18 59 33 51 60 52 1 59 31 12 -0.76 48 0 1 60 30 15 19 26 42.3 48 116 -49 61 8 0 59 52 52 61 10 42 59 50 14 -0.76 49 0 1 60 48 39 19 26 35.7 48 117 -48 61 26 14 60 11 26 61 28 55 60 8 48 -0.76 50 0 1 61 6 35 19 26 29.1 49 118 -48 61 44 1 60 29 31 61 46 41 60 26 54 -0.76 51 0 1 61 24 4 19 26 22.7 49 120 -48 62 1 20 60 47 10 62 3 59 60 44 33 -0.76 52 0 1 61 41 6 19 26 16.3 49 121 -48 62 18 12 61 4 21 62 20 51 61 1 45 -0.76 53 0 1 61 57 41 19 26 9.9 49 123 -48 62 34 38 61 21 6 62 37 16 61 18 31 -0.76 54 0 1 62 13 50 19 26 3.7 50 124 -48 62 50 37 61 37 25 62 53 14 61 34 50 -0.76 55 0 1 62 29 34 19 25 57.5 50 125 -48 63 6 11 61 53 17 63 8 47 61 50 44 -0.76 56 0 1 62 44 52 19 25 51.3 50 127 -48 63 21 19 62 8 45 63 23 55 62 6 12 -0.76 57 0 1 62 59 44 19 25 45.2 50 128 -47 63 36 2 62 23 47 63 38 38 62 21 14 -0.76 58 0 1 63 14 13 19 25 39.2 50 130 -47 63 50 21 62 38 24 63 52 56 62 35 52 -0.76 59 0 1 63 28 16 19 25 33.2 51 131 -47 64 4 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-0.77 -161 0 0 44 26 25 19 14 23.6 12 301 11 45 7 51 43 45 28 45 10 49 43 42 35 -0.78 -160 0 0 43 50 4 19 14 20.7 11 302 12 44 31 29 43 9 7 44 34 27 43 6 14 -0.78 -159 0 0 43 13 20 19 14 18.1 10 303 13 43 54 45 42 32 25 43 57 43 42 29 31 -0.79 -158 0 0 42 36 16 19 14 15.6 9 303 14 43 17 40 41 55 22 43 20 37 41 52 28 -0.79 -157 0 0 41 58 52 19 14 13.3 8 304 15 42 40 14 41 17 59 42 43 11 41 15 6 -0.80 -156 0 0 41 21 9 19 14 11.3 7 305 16 42 2 29 40 40 19 42 5 26 40 37 26 -0.81 -155 0 0 40 43 10 19 14 9.5 6 305 17 41 24 26 40 2 21 41 27 23 39 59 29 -0.82 -154 0 0 40 4 54 19 14 7.9 5 306 18 40 46 7 39 24 8 40 49 4 39 21 16 -0.84 -153 0 0 39 26 23 19 14 6.6 4 307 19 40 7 33 38 45 41 40 10 30 38 42 49 -0.87 -152 0 0 38 47 39 19 14 5.6 3 307 20 39 28 45 38 7 1 39 31 41 38 4 9 -0.92 -151 0 0 38 8 44 19 14 4.8 2 308 21 38 49 45 37 28 10 38 52 41 37 25 18 -1.01 -150 0 0 37 29 38 19 14 4.3 1 308 22 38 10 34 36 49 9 38 13 30 36 46 17 -1.26 -149 0 0 36 50 23 19 14 4.1 0 309 23 37 31 14 .. .. .. 37 34 9 .. .. .. -5.83 Uncertainty in time = +/- 2 secs Prediction of 2023 Oct 15.9 Data for the target star ------------------------ * name: UCAC4 603-026747 * constellation : Auriga * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 05 51 33.5025 DE: +30 24 35.621 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 05 51 33.5025 DE: +30 24 35.621 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (407) Arachne asteroid class: approx. diameter [km]: 94 approx. diameter ["]: 0.081 distance from Earth [AU]: 1.60530 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#66 date of fit: 2023 Oct 09 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", 0.001", 96.465° remarks: * orbital elements for (407)Arachne : Mean anomaly = 55.5259697318 deg Arg. of pericenter = 81.3159423692 deg Long. of node = 294.4574499645 deg Inclination = 7.5194572160 deg Eccentricity = 0.0708397381 Semimajor axis = 2.6249316357 AU Perihelion dist = 2.4389821661 AU Mag: H = 9.22, G = 0.15 Epoch of elements : MJD 60273.80784722 TDT (2023 Nov 25.8078) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#662023Oct09,10.43,2023,11,25,19.390736,-0.068692,0.599590,-5.060276,-0.580048,-0.002447,-0.000667,0.000001,0.000000 92.9383,30.4163,-114.11,-20.81,False UCAC4 603-026747,5.85930624,30.4098946,0.00,12.36,0.00,0.0,4,,5.88515822,30.4163392,1.00,0.00,0,0,0 407,Arachne,12.82,94.100,1.6053,0,0,-2.143,-3.18,,6.2,0 0,55.3387,2023,11,25,81.3159,294.4574,7.5195,0.07084,2.62493,2.43898,9.13,5.0,0.15 1.035,0.0120,0.0010,96,0.0120,Known errors,-1.00,0,-1,-1 20231125_026747,60232.88 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Oct 15, 21:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org