IOTA/IOTA-ES occultation update for (1628) Strobel / UCAC4-432-005136 event on 2023 Nov 13, 15:54 UT Visible from SE Australia Summary ------- On 2023 Nov 13 UT, the 57 km diameter asteroid (1628) Strobel will occult a 12.4 mag star in the constellation Eridanus for observers along a path across SE Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.33 mag to 14.60 mag (the magnitude of the asteroid) for at most 4.300 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: 2023 Nov 13, 15:48 - 2023 Nov 13, 16:01 * geocentric midpoint of event [JD]: 2460262.16334034 * magnitude of target star: 12.40 * magnitude drop [mag]: 2.33 * estimated maximum duration [s]: 4.300 * Moon: 0 % sunlit, 154° distance * Sun: 156° distance * rough path description: SE Australia The occultation path -------------------- * approximate projected width [km]: 71 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.000) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.000", 89°) * approx speed of asteroid's shadow [km/s]: 13.2417 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-432-005136 by 1628 Strobel on 2023 Nov 13 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 26 59 59 -68 51 52 16 1 35.6 0 99 16 -68 32 25 -69 11 25 -68 25 26 -69 18 28 .... 27 59 59 -68 55 24 16 1 35.6 1 98 16 -68 35 58 -69 14 54 -68 29 0 -69 21 57 0.59 28 59 59 -68 58 39 16 1 35.5 1 98 16 -68 39 16 -69 18 8 -68 32 18 -69 25 9 0.65 29 59 59 -69 1 39 16 1 35.5 1 97 15 -68 42 17 -69 21 6 -68 35 21 -69 28 7 0.68 30 59 59 -69 4 24 16 1 35.4 2 96 15 -68 45 3 -69 23 49 -68 38 7 -69 30 49 0.69 31 59 59 -69 6 53 16 1 35.2 2 95 14 -68 47 34 -69 26 17 -68 40 38 -69 33 16 0.70 32 59 59 -69 9 7 16 1 35.1 2 94 14 -68 49 49 -69 28 29 -68 42 54 -69 35 28 0.71 33 59 59 -69 11 5 16 1 34.9 3 93 14 -68 51 49 -69 30 27 -68 44 54 -69 37 25 0.72 34 59 59 -69 12 49 16 1 34.7 3 92 13 -68 53 33 -69 32 9 -68 46 39 -69 39 8 0.72 35 59 59 -69 14 17 16 1 34.5 3 91 13 -68 55 3 -69 33 37 -68 48 9 -69 40 35 0.72 36 59 59 -69 15 31 16 1 34.3 4 90 13 -68 56 17 -69 34 50 -68 49 23 -69 41 48 0.72 37 59 59 -69 16 30 16 1 34.0 4 89 12 -68 57 16 -69 35 48 -68 50 23 -69 42 46 0.73 38 59 59 -69 17 14 16 1 33.7 4 88 12 -68 58 0 -69 36 32 -68 51 7 -69 43 29 0.73 39 59 59 -69 17 43 16 1 33.4 5 87 12 -68 58 30 -69 37 0 -68 51 36 -69 43 58 0.73 40 59 59 -69 17 57 16 1 33.1 5 86 11 -68 58 44 -69 37 14 -68 51 51 -69 44 12 0.73 41 59 59 -69 17 56 16 1 32.8 6 85 11 -68 58 43 -69 37 14 -68 51 50 -69 44 12 0.73 42 59 59 -69 17 41 16 1 32.4 6 84 11 -68 58 28 -69 36 59 -68 51 34 -69 43 57 0.73 43 59 59 -69 17 11 16 1 32.0 6 84 10 -68 57 57 -69 36 29 -68 51 3 -69 43 27 0.73 44 59 59 -69 16 26 16 1 31.6 7 83 10 -68 57 12 -69 35 45 -68 50 18 -69 42 43 0.73 45 59 59 -69 15 26 16 1 31.1 7 82 10 -68 56 11 -69 34 46 -68 49 17 -69 41 44 0.74 46 59 59 -69 14 11 16 1 30.7 7 81 10 -68 54 56 -69 33 32 -68 48 1 -69 40 31 0.74 47 59 59 -69 12 42 16 1 30.2 8 80 9 -68 53 25 -69 32 4 -68 46 30 -69 39 3 0.74 48 59 59 -69 10 58 16 1 29.7 8 79 9 -68 51 39 -69 30 20 -68 44 44 -69 37 20 0.74 49 59 59 -69 8 58 16 1 29.1 8 78 9 -68 49 39 -69 28 22 -68 42 43 -69 35 22 0.74 50 59 59 -69 6 43 16 1 28.6 9 77 8 -68 47 23 -69 26 9 -68 40 26 -69 33 10 0.74 51 59 59 -69 4 14 16 1 28.0 9 76 8 -68 44 51 -69 23 41 -68 37 54 -69 30 42 0.74 52 59 59 -69 1 28 16 1 27.4 9 75 8 -68 42 4 -69 20 58 -68 35 7 -69 28 0 0.74 53 59 59 -68 58 28 16 1 26.7 10 74 7 -68 39 2 -69 17 59 -68 32 4 -69 25 2 0.74 54 59 59 -68 55 12 16 1 26.1 10 73 7 -68 35 44 -69 14 46 -68 28 45 -69 21 49 0.74 55 59 59 -68 51 41 16 1 25.4 11 72 7 -68 32 10 -69 11 16 -68 25 10 -69 18 20 0.74 56 59 59 -68 47 53 16 1 24.6 11 71 6 -68 28 20 -69 7 31 -68 21 20 -69 14 36 0.74 57 59 59 -68 43 50 16 1 23.9 11 70 6 -68 24 14 -69 3 31 -68 17 13 -69 10 37 0.74 58 59 59 -68 39 31 16 1 23.1 12 70 6 -68 19 52 -68 59 14 -68 12 50 -69 6 21 0.74 59 59 59 -68 34 55 16 1 22.3 12 69 5 -68 15 14 -68 54 42 -68 8 11 -69 1 50 0.74 60 59 59 -68 30 3 16 1 21.5 12 68 5 -68 10 19 -68 49 53 -68 3 14 -68 57 2 0.74 61 59 59 -68 24 55 16 1 20.6 13 67 5 -68 5 7 -68 44 47 -67 58 2 -68 51 58 0.74 62 59 59 -68 19 29 16 1 19.7 13 66 4 -67 59 39 -68 39 26 -67 52 32 -68 46 37 0.74 63 59 59 -68 13 47 16 1 18.8 13 65 4 -67 53 53 -68 33 47 -67 46 45 -68 40 59 0.75 64 59 59 -68 7 48 16 1 17.8 14 64 3 -67 47 50 -68 27 51 -67 40 40 -68 35 5 0.75 65 59 59 -68 1 31 16 1 16.8 14 63 3 -67 41 29 -68 21 38 -67 34 18 -68 28 53 0.75 66 59 59 -67 54 56 16 1 15.8 15 62 3 -67 34 50 -68 15 7 -67 27 38 -68 22 24 0.75 67 59 59 -67 48 3 16 1 14.8 15 61 2 -67 27 54 -68 8 18 -67 20 40 -68 15 37 0.75 68 59 59 -67 40 53 16 1 13.7 15 60 2 -67 20 39 -68 1 12 -67 13 24 -68 8 32 0.75 69 59 59 -67 33 23 16 1 12.5 16 59 2 -67 13 5 -67 53 47 -67 5 48 -68 1 9 0.75 70 59 59 -67 25 35 16 1 11.3 16 58 1 -67 5 12 -67 46 4 -66 57 54 -67 53 27 0.75 71 59 59 -67 17 28 16 1 10.1 17 57 1 -66 57 1 -67 38 1 -66 49 41 -67 45 26 0.75 72 59 59 -67 9 2 16 1 8.9 17 56 1 -66 48 30 -67 29 40 -66 41 8 -67 37 6 0.75 73 59 59 -67 0 16 16 1 7.6 17 55 0 -66 39 39 -67 20 59 -66 32 15 -67 28 27 0.75 74 59 59 -66 51 10 16 1 6.3 18 54 0 -66 30 28 -67 11 58 -66 23 2 -67 19 28 0.75 75 59 59 -66 41 43 16 1 4.9 18 54 0 -66 20 56 -67 2 36 -66 13 29 -67 10 9 0.75 76 59 59 -66 31 56 16 1 3.5 19 53 -1 -66 11 4 -66 52 55 -66 3 35 -67 0 29 0.75 77 59 59 -66 21 48 16 1 2.0 19 52 -1 -66 0 50 -66 42 52 -65 53 19 -66 50 28 0.75 78 59 59 -66 11 19 16 1 0.5 19 51 -2 -65 50 15 -66 32 28 -65 42 42 -66 40 7 0.75 79 59 59 -66 0 27 16 0 58.9 20 50 -2 -65 39 18 -66 21 43 -65 31 44 -66 29 23 0.75 80 59 59 -65 49 14 16 0 57.3 20 49 -2 -65 27 59 -66 10 36 -65 20 22 -66 18 18 0.75 81 59 59 -65 37 38 16 0 55.6 21 48 -3 -65 16 17 -65 59 6 -65 8 38 -66 6 50 0.75 82 59 59 -65 25 40 16 0 53.9 21 47 -3 -65 4 13 -65 47 13 -64 56 32 -65 55 0 0.75 83 59 59 -65 13 17 16 0 52.1 22 46 -3 -64 51 44 -65 34 57 -64 44 1 -65 42 46 0.75 84 59 59 -65 0 32 16 0 50.2 22 45 -4 -64 38 52 -65 22 18 -64 31 7 -65 30 9 0.75 85 59 59 -64 47 22 16 0 48.3 23 44 -4 -64 25 36 -65 9 14 -64 17 48 -65 17 8 0.75 86 59 59 -64 33 47 16 0 46.4 23 43 -5 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-13 59 39 -14 42 5 -13 52 4 -14 49 45 0.75 -175 0 0 -13 54 1 15 50 33.5 33 275 -17 -13 32 56 -14 15 12 -13 25 23 -14 22 50 0.75 -174 0 0 -13 27 50 15 50 27.6 32 274 -16 -13 6 50 -13 48 55 -12 59 19 -13 56 32 0.75 -173 0 0 -13 2 15 15 50 21.8 32 274 -16 -12 41 20 -13 23 15 -12 33 51 -13 30 50 0.75 -172 0 0 -12 37 17 15 50 16.1 31 273 -15 -12 16 27 -12 58 12 -12 9 0 -13 5 45 0.75 -171 0 0 -12 12 56 15 50 10.6 30 273 -14 -11 52 12 -12 33 46 -11 44 46 -12 41 17 0.76 -170 0 0 -11 49 13 15 50 5.3 29 272 -13 -11 28 33 -12 9 58 -11 21 9 -12 17 28 0.76 -169 0 0 -11 26 7 15 50 0.2 28 272 -13 -11 5 32 -11 46 48 -10 58 10 -11 54 16 0.76 -168 0 0 -11 3 40 15 49 55.2 27 272 -12 -10 43 10 -11 24 16 -10 35 49 -11 31 42 0.76 -167 0 0 -10 41 51 15 49 50.4 26 271 -11 -10 21 25 -11 2 23 -10 14 6 -11 9 48 0.76 -166 0 0 -10 20 41 15 49 45.8 25 271 -10 -10 0 20 -10 41 9 - 9 53 2 -10 48 32 0.76 -165 0 0 -10 0 10 15 49 41.3 24 270 -10 - 9 39 52 -10 20 33 - 9 32 36 -10 27 55 0.76 -164 0 0 - 9 40 18 15 49 37.0 23 270 -9 - 9 20 4 -10 0 37 - 9 12 49 -10 7 57 0.76 -163 0 0 - 9 21 5 15 49 32.9 22 270 -8 - 9 0 55 - 9 41 20 - 8 53 41 - 9 48 38 0.76 -162 0 0 - 9 2 31 15 49 29.0 21 270 -7 - 8 42 25 - 9 22 43 - 8 35 13 - 9 30 0 0.76 -161 0 0 - 8 44 37 15 49 25.2 20 269 -6 - 8 24 35 - 9 4 45 - 8 17 24 - 9 12 1 0.76 -160 0 0 - 8 27 23 15 49 21.6 19 269 -6 - 8 7 24 - 8 47 27 - 8 0 14 - 8 54 42 0.77 -159 0 0 - 8 10 49 15 49 18.2 18 269 -5 - 7 50 53 - 8 30 50 - 7 43 45 - 8 38 3 0.77 -158 0 0 - 7 54 55 15 49 15.0 17 269 -4 - 7 35 2 - 8 14 52 - 7 27 55 - 8 22 4 0.77 -157 0 0 - 7 39 41 15 49 11.9 16 268 -3 - 7 19 51 - 7 59 35 - 7 12 45 - 8 6 46 0.77 -156 0 0 - 7 25 7 15 49 9.1 15 268 -2 - 7 5 20 - 7 44 58 - 6 58 15 - 7 52 8 0.77 -155 0 0 - 7 11 13 15 49 6.4 14 268 -1 - 6 51 30 - 7 31 2 - 6 44 25 - 7 38 11 0.78 -154 0 0 - 6 58 1 15 49 3.9 13 268 -1 - 6 38 19 - 7 17 47 - 6 31 16 - 7 24 55 0.78 -153 0 0 - 6 45 28 15 49 1.6 12 268 0 - 6 25 50 - 7 5 12 - 6 18 47 - 7 12 19 0.78 -152 0 0 - 6 33 37 15 48 59.4 11 268 1 - 6 14 0 - 6 53 18 - 6 6 59 - 7 0 24 0.78 -151 0 0 - 6 22 26 15 48 57.5 10 267 2 - 6 2 52 - 6 42 5 - 5 55 51 - 6 49 11 0.79 -150 0 0 - 6 11 56 15 48 55.7 9 267 3 - 5 52 24 - 6 31 33 - 5 45 24 - 6 38 38 0.79 -149 0 0 - 6 2 7 15 48 54.1 8 267 4 - 5 42 37 - 6 21 43 - 5 35 38 - 6 28 46 0.80 -148 0 0 - 5 53 0 15 48 52.7 7 267 5 - 5 33 31 - 6 12 33 - 5 26 32 - 6 19 36 0.81 -147 0 0 - 5 44 33 15 48 51.4 6 267 6 - 5 25 6 - 6 4 5 - 5 18 8 - 6 11 8 0.82 -146 0 0 - 5 36 48 15 48 50.4 5 267 7 - 5 17 22 - 5 56 18 - 5 10 24 - 6 3 20 0.83 -145 0 0 - 5 29 44 15 48 49.5 4 267 8 - 5 10 19 - 5 49 13 - 5 3 22 - 5 56 14 0.85 -144 0 0 - 5 23 21 15 48 48.8 3 267 8 - 5 3 58 - 5 42 49 - 4 57 1 - 5 49 50 0.88 -143 0 0 - 5 17 40 15 48 48.3 2 267 9 - 4 58 18 - 5 37 7 - 4 51 21 - 5 44 8 0.93 -142 0 0 - 5 12 40 15 48 48.0 1 267 10 - 4 53 19 - 5 32 6 - 4 46 23 - 5 39 7 1.08 -141 0 0 - 5 8 22 15 48 47.9 0 266 11 - 4 49 2 - 5 27 48 - 4 42 6 - 5 34 48 2.39 Uncertainty in time = +/- 2 secs Prediction of 2023 Oct 15.9 Data for the target star ------------------------ * name: UCAC4-432-005136 * constellation : Eridanus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 03 53 18.7339 DE: -03 39 06.701 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 03 53 18.7339 DE: -03 39 06.701 * 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: (1628) Strobel asteroid class: approx. diameter [km]: 57 approx. diameter ["]: 0.040 distance from Earth [AU]: 1.96150 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#57 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): 0.014", 0.000", 89.039° remarks: * orbital elements for (1628)Strobel : Mean anomaly = 312.5600880139 deg Arg. of pericenter = 287.1441857280 deg Long. of node = 181.1209490816 deg Inclination = 19.3667279565 deg Eccentricity = 0.0632175285 Semimajor axis = 3.0169093845 AU Perihelion dist = 2.8261878294 AU Mag: H = 10.26, G = 0.15 Epoch of elements : MJD 60261.66312500 TDT (2023 Nov 13.6631) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Oct09,4.30,2023,11,13,15.920168,0.317770,-0.510819,-6.346307,-3.947737,-0.000984,0.002182,0.000001,0.000000 127.3201,-3.5795,-62.73,-18.01,False UCAC4-432-005136,3.88853718,-3.6518612,0.00,12.40,0.00,0.0,0,,3.90868219,-3.5794915,2.33,0.00,0,0,0 1628,Strobel,14.60,57.000,1.9615,0,0,-1.900,-17.70,,2.6,0 0,312.4354,2023,11,13,287.1442,181.1209,19.3667,0.06322,3.01691,2.82619,10.27,5.0,0.15 1.180,0.0140,0.0004,89,0.0140,Known errors,-1.00,0,-1,-1 20231113_005136,60232.88 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Oct 15, 21:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org