IOTA/IOTA-ES occultation update for (4206) Verulamium / UCAC4 342-082054 event on 2024 Sep 23, 09:44 UT Visible from Summary ------- On 2024 Sep 23 UT, the 8.43718905938152 km diameter asteroid (4206) Verulamium will occult a 11.1 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.96 mag to 18.09 mag (the magnitude of the asteroid) for at most 0.330 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: 99 * date and approx. time of event: 2024 Sep 23, 09:40 - 2024 Sep 23, 09:48 * geocentric midpoint of event [JD]: 2460576.90608821 * magnitude of target star: 11.13 * magnitude drop [mag]: 6.96 * estimated maximum duration [s]: 0.330 * Moon: 66 % sunlit, 174° distance * Sun: 71° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 9 * 1 sigma uncertainty interval [path widths]: +/- 0.29 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.001", 97°) * approx speed of asteroid's shadow [km/s]: 26.8811 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 342-082054 by 4206 Verulamium on 2024 Sep 23 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 9 0 0 -10 42 41 9 41 1.0 1 112 64 -10 45 26 -10 39 57 -10 47 2 -10 38 21 .... 10 0 0 -11 7 9 9 41 1.1 2 112 65 -11 9 54 -11 4 24 -11 11 30 -11 2 48 0.32 11 0 0 -11 31 47 9 41 1.3 3 112 66 -11 34 32 -11 29 2 -11 36 8 -11 27 26 0.33 12 0 0 -11 56 35 9 41 1.6 4 112 66 -11 59 20 -11 53 49 -12 0 56 -11 52 13 0.33 13 0 0 -12 21 31 9 41 1.9 5 111 67 -12 24 17 -12 18 46 -12 25 53 -12 17 9 0.33 14 0 0 -12 46 36 9 41 2.4 6 111 68 -12 49 22 -12 43 50 -12 50 58 -12 42 14 0.33 15 0 0 -13 11 49 9 41 2.9 7 111 68 -13 14 35 -13 9 3 -13 16 11 -13 7 27 0.34 16 0 0 -13 37 9 9 41 3.5 8 111 69 -13 39 55 -13 34 23 -13 41 32 -13 32 46 0.34 17 0 0 -14 2 35 9 41 4.2 9 110 69 -14 5 22 -13 59 49 -14 6 58 -13 58 12 0.34 18 0 0 -14 28 8 9 41 5.0 10 110 70 -14 30 54 -14 25 21 -14 32 31 -14 23 45 0.34 19 0 0 -14 53 45 9 41 5.9 11 110 70 -14 56 32 -14 50 59 -14 58 8 -14 49 22 0.34 20 0 0 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263 -37 -34 57 14 -34 51 54 -34 58 47 -34 50 21 0.35 170 0 0 -34 38 3 9 47 59.7 29 262 -38 -34 40 43 -34 35 22 -34 42 16 -34 33 49 0.35 171 0 0 -34 21 12 9 48 1.5 28 262 -39 -34 23 53 -34 18 31 -34 25 26 -34 16 58 0.35 172 0 0 -34 4 2 9 48 3.3 27 261 -40 -34 6 43 -34 1 21 -34 8 16 -33 59 48 0.35 173 0 0 -33 46 33 9 48 5.0 26 260 -41 -33 49 14 -33 43 52 -33 50 48 -33 42 18 0.35 174 0 0 -33 28 45 9 48 6.7 25 260 -42 -33 31 27 -33 26 4 -33 33 0 -33 24 30 0.35 175 0 0 -33 10 38 9 48 8.4 24 259 -42 -33 13 20 -33 7 57 -33 14 54 -33 6 23 0.35 176 0 0 -32 52 13 9 48 10.0 24 258 -43 -32 54 55 -32 49 31 -32 56 29 -32 47 57 0.35 177 0 0 -32 33 29 9 48 11.5 23 258 -44 -32 36 11 -32 30 47 -32 37 46 -32 29 13 0.35 178 0 0 -32 14 27 9 48 13.0 22 257 -45 -32 17 9 -32 11 44 -32 18 44 -32 10 10 0.35 179 0 0 -31 55 7 9 48 14.5 21 257 -46 -31 57 50 -31 52 24 -31 59 24 -31 50 50 0.35 180 0 0 -31 35 29 9 48 15.9 20 256 -47 -31 38 12 -31 32 46 -31 39 47 -31 31 11 0.35 -179 0 0 -31 15 34 9 48 17.2 19 255 -48 -31 18 17 -31 12 51 -31 19 52 -31 11 16 0.35 -178 0 0 -30 55 21 9 48 18.5 18 255 -48 -30 58 5 -30 52 38 -30 59 40 -30 51 3 0.35 -177 0 0 -30 34 52 9 48 19.8 17 254 -49 -30 37 36 -30 32 8 -30 39 11 -30 30 33 0.35 -176 0 0 -30 14 6 9 48 21.0 16 254 -50 -30 16 50 -30 11 22 -30 18 25 -30 9 47 0.36 -175 0 0 -29 53 3 9 48 22.1 15 253 -51 -29 55 47 -29 50 19 -29 57 23 -29 48 44 0.36 -174 0 0 -29 31 45 9 48 23.1 14 253 -52 -29 34 29 -29 29 0 -29 36 5 -29 27 25 0.36 -173 0 0 -29 10 10 9 48 24.1 13 252 -53 -29 12 55 -29 7 26 -29 14 31 -29 5 50 0.36 -172 0 0 -28 48 21 9 48 25.1 13 252 -54 -28 51 6 -28 45 36 -28 52 42 -28 44 0 0.36 -171 0 0 -28 26 16 9 48 26.0 12 251 -54 -28 29 1 -28 23 31 -28 30 37 -28 21 55 0.37 -170 0 0 -28 3 57 9 48 26.8 11 251 -55 -28 6 42 -28 1 12 -28 8 19 -27 59 36 0.37 -169 0 0 -27 41 24 9 48 27.5 10 250 -56 -27 44 9 -27 38 39 -27 45 46 -27 37 3 0.37 -168 0 0 -27 18 37 9 48 28.2 9 250 -57 -27 21 23 -27 15 51 -27 22 59 -27 14 15 0.37 -167 0 0 -26 55 37 9 48 28.8 8 249 -58 -26 58 22 -26 52 51 -26 59 59 -26 51 15 0.38 -166 0 0 -26 32 23 9 48 29.3 7 249 -59 -26 35 9 -26 29 37 -26 36 46 -26 28 1 0.39 -165 0 0 -26 8 58 9 48 29.8 6 249 -59 -26 11 44 -26 6 12 -26 13 20 -26 4 35 0.39 -164 0 0 -25 45 20 9 48 30.2 5 248 -60 -25 48 6 -25 42 34 -25 49 43 -25 40 57 0.41 -163 0 0 -25 21 31 9 48 30.5 4 248 -61 -25 24 17 -25 18 45 -25 25 54 -25 17 8 0.42 -162 0 0 -24 57 31 9 48 30.8 3 247 -62 -25 0 17 -24 54 45 -25 1 54 -24 53 8 0.45 -161 0 0 -24 33 20 9 48 31.0 2 247 -63 -24 36 7 -24 30 34 -24 37 44 -24 28 57 0.51 -160 0 0 -24 9 0 9 48 31.1 1 246 -63 -24 11 47 -24 6 14 -24 13 24 -24 4 37 0.72 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 342-082054 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 40 54.4076 DE: -21 46 48.966 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 40 54.4076 DE: -21 46 48.966 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.1 * B mag [mag]: 12.5 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4206) Verulamium asteroid class: approx. diameter [km]: 8 approx. diameter ["]: 0.004 distance from Earth [AU]: 2.97000 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): 0.012", 0.001", 97.11° remarks: * orbital elements for (4206)Verulamium : Mean anomaly = 355.5074009371 deg Arg. of pericenter = 26.4222816642 deg Long. of node = 249.6744150983 deg Inclination = 1.1697129593 deg Eccentricity = 0.0178434435 Semimajor axis = 2.8623252315 AU Perihelion dist = 2.8112514929 AU Mag: H = 12.50, G = 0.15 Epoch of elements : MJD 60576.40608804 TDT (2024 Sep 23.4061) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#592023Apr24,0.33,2024,9,23,9.746117,-0.040039,-0.313254,15.052748,-1.902096,0.005362,-0.000705,0.000000,0.000000 101.6661,-21.8285,31.86,-0.34,False UCAC4 342-082054,16.68177992,-21.7802683,12.46,11.13,10.41,0.2,4,,16.70615696,-21.8285390,6.96,7.23,0,0,0 4206,Verulamium,18.09,8.868,2.9700,0,0,3.202,-5.63,,0.8,0 0,355.4248,2024,9,23,26.4223,249.6744,1.1697,0.01784,2.86233,2.81125,12.49,5.0,0.15 1.290,0.0120,0.0012,97,0.0012,Known errors,0.92,0,-1,-1 20240923_082054,60140.58 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org