Observing NEAR - Sunglints and other times
Joan and David Dunham (dunham@erols.com)
Tue, 20 Jan 1998 02:34:30 -0500
Observing NEAR during the Earth swingby - Sunglints and other times
A map of the path of the NEAR Sunglint is not yet on the NEAR Web
site, but is planned to be put up there later today. A Universal Time
version was posted on the two IOTA Web sites over the weekend, and a
local-time version has been prepared (with many of the city errors in
the U.T. version corrected) and will be posted on the NEAR site later
today, possibly sooner at the IOTA anomalies.com site. A similar
schedule applies to basic sky views for the following ten regions:
Area for sky chart Local time
New York and New England 1:24- 1:27 am EST Jan. 23
Midwest 12:26-12:29 am CST Jan. 23
Colorado & northern New Mex. 11:27-11:29 pm MST Jan. 22
Mid-Atlantic States 1:29- 1:31 am EST Jan. 23 (& maybe 1:25)
Georgia, Florida, & Carolinas 1:30- 1:35 am EST Jan. 23
Texas and Louisiana 12:36-12:39 am CST Jan. 23
southern New Mex. & Arizona 11:39 pm MST Jan. 22 (these two lines
n. Ariz., Utah, s.e. Idaho 11:41-11:44 pm MST Jan. 22 have one chart)
California and Nevada 10:39-10:45 pm PST Jan. 22
Pacific Northwest 10:45-10:48 pm PST Jan. 22
Maui and Oahu, Hawaii 8:48- 8:49 pm HST Jan. 22
The time for any location can be determined more accurately from the
maps mentioned above. The U.T. hour is the same for all locations: 6h
of Jan. 23. The ten basic sky charts have labelled only Capella, NEAR,
and the Seven Sisters (Pleiades) star cluster. Constellations and
several other stars are identified on the Eastern U.S. and Western U.S.
sky charts on the NEAR Web site (get to them by clicking on "Get ready
for Earth Swingby" in the upper right, and then on "Sunglint
maneuvers"). Also there is a chart of Perseus, with north up, showing
in more detail the location of NEAR during the Sunglint maneuvers for
almost 40 cities; it will help those using large binoculars or
telescopes which, however, are not necessary; the glint should be easily
visible with the naked eye. Note that the Sunglint maneuvers are
performed only by rotating the spacecraft slightly using momentum
wheels, powered by the ample electricity available from the solar
panels; there are no thrusting maneuvers using the spacecraft's fuel to
accomplish these pointings.
The magnitude of the Sunglint can be calculated fairly well,
knowing the 8.92 square meters of the solar panels and the fact that 89%
of the sunlight that falls on them is absorbed (so 11% of the light is
assumed to be specularly reflected). This gives mag. 0.0 at 6:24 U.T.
(1:24 am EST) and mag. -1.3 at 6:49 U.T. (8:49 pm HST). But the actual
magnitude may be a little fainter since the minimum distance from NEAR
to the Earth's surface is used, while the actual slant range to the
areas that the Sunglint illuminates is greater. Even if only one of the
four solar panels produces a glint at your location, it will be 1.5 mag.
fainter than the full glint with all four panels, still very bright (2nd
or 1st magnitude) and easy to see without optical aid. Since the solar
panels may be misaligned slightly, the Sunglint could occur in steps as
more panels catch sunlight. Timings of these steps to a few tenths of a
second will be valuable to measure the misalignments, information that
will be useful for calculating solar radiation pressure forces on the
spacecraft in the weak gravity field of Eros.
Much less certain is how bright NEAR will be when it is not
"glinting". After launch in Feb. 1996, Spacewatch detected NEAR at 20th
mag. at a distance of 300,000 km. But at that time, NEAR was departing
at a Solar elongation of almost 90 deg. and the solar panels were kept
pointing at the Sun, so that almost all of the spacecraft presented to
the Earth would have been in shadow. By comparison, at that distance,
the Sunglint would be 6th mag.! During the approach during the next few
days, the geometry is much more favorable, with a phase angle of about
40 deg., so at least the 1.5-meter white parabolic high-gain antenna
should give a rather good diffuse reflection. I estimate that NEAR will
be about 5 magnitudes brighter than when it departed, or about 5000
times fainter than the Sunglint situation. I have used that assumption
for computing the magnitude in the geocentric table of NEAR given below,
starting at 3 hr. intervals and decreasing as the distance decreases.
Any magnitude estimates, even approximate, that could be made with large
telescopes before Jan. 22.5 U.T. would be valuable for adjusting this
table and therefore most welcome; I will distribute an updated version
as soon as any observations are received. Note that AFTER the swingby,
NEAR's declination will remain near -71 deg., visible only from Southern
Hemisphere observatories, and will likely be a few magnitudes fainter
than the magnitudes listed due to the unfavorable departure Solar
elongation, similar to that for NEAR's departure after launch in 1996.
The Sunglint magnitude is given during the Sunglint maneuvers on Jan. 23
U.T. from 6:22 to 6:50 U.T.
NEAR's parallax is already 0.2 deg. at 1.8 million km distance,
and this will increase as it approaches, to well over 10 deg. during the
Sunglint maneuvers. I can provide topocentric ephemerides upon request
to those with large telescopes who plan early observations. I will also
try to process such requests for those with medium and small telescopes
as time permits, but to help that, we are working with the Minor Planet
Center at the Harvard Center for Astrophysics to allow Web users to
generate their own topocentric ephemeris by specifying their
geographical coordinates and a specified time range and interval. They
have done this in the past with asteroids that pass very close to the
Earth. The Web site will be distributed as soon as it is ready. In the
meantime, I will also generate some topocentric ephemerides and sky
charts to post on the NEAR, and possibly IOTA, Web sites as time
permits. Specific requests can be sent to me here, but from 15h U.T. to
25h U.T. (that is, 1h U.T. of the next date), you should instead send
your request to: David.Dunham@jhuapl.edu (or send to both this address
and that one near 15h or 1h U.T.).
David Dunham, IOTA and NEAR Mission Design, 1998 Jan. 20, 7h U.T.
Geocentric ephemeris for NEAR from JPL ephemeris file p_tcm11_n0a
generated 1998 Jan. 19
Calendar Solar J2000 min.topo.
Date UTC Elong. R.A. Dec. Distance NEAR
Year Mo Day h m deg. deg. deg. km Mag.
1998 JAN 20 0:00 141.93 81.14958 20.91989 1991680 18.6
1998 JAN 20 3:00 141.79 81.14183 20.93302 1917225 18.5
1998 JAN 20 6:00 141.66 81.13379 20.94724 1842767 18.5
1998 JAN 20 9:00 141.53 81.12542 20.96269 1768305 18.4
1998 JAN 20 12:00 141.39 81.11666 20.97952 1693838 18.3
1998 JAN 20 15:00 141.26 81.10743 20.99794 1619363 18.2
1998 JAN 20 18:00 141.13 81.09765 21.01815 1544879 18.1
1998 JAN 20 21:00 140.99 81.08722 21.04044 1470385 18.0
1998 JAN 21 0:00 140.86 81.07601 21.06512 1395877 17.9
1998 JAN 21 3:00 140.72 81.06387 21.09261 1321354 17.7
1998 JAN 21 6:00 140.59 81.05061 21.12339 1246812 17.6
1998 JAN 21 9:00 140.45 81.03600 21.15810 1172248 17.5
1998 JAN 21 12:00 140.31 81.01973 21.19753 1097657 17.3
1998 JAN 21 14:00 140.22 81.00778 21.22692 1047914 17.2
1998 JAN 21 16:00 140.13 80.99478 21.25924 998154 17.1
1998 JAN 21 18:00 140.03 80.98055 21.29494 948378 17.0
1998 JAN 21 20:00 139.94 80.96489 21.33457 898581 16.9
1998 JAN 21 22:00 139.84 80.94753 21.37883 848763 16.8
1998 JAN 22 0:00 139.74 80.92815 21.42858 798920 16.7
1998 JAN 22 1:00 139.69 80.91757 21.45584 773987 16.6
1998 JAN 22 2:00 139.64 80.90632 21.48489 749047 16.5
1998 JAN 22 3:00 139.59 80.89433 21.51594 724099 16.4
1998 JAN 22 4:00 139.54 80.88152 21.54918 699142 16.4
1998 JAN 22 5:00 139.49 80.86779 21.58486 674175 16.3
1998 JAN 22 6:00 139.44 80.85304 21.62325 649198 16.2
1998 JAN 22 7:00 139.38 80.83714 21.66469 624210 16.1
1998 JAN 22 8:00 139.33 80.81995 21.70955 599210 16.0
1998 JAN 22 9:00 139.27 80.80130 21.75827 574197 15.9
1998 JAN 22 10:00 139.22 80.78099 21.81138 549169 15.8
1998 JAN 22 11:00 139.16 80.75876 21.86950 524126 15.7
1998 JAN 22 12:00 139.10 80.73434 21.93338 499065 15.6
1998 JAN 22 13:00 139.04 80.70738 22.00392 473986 15.5
1998 JAN 22 14:00 138.98 80.67744 22.08223 448885 15.4
1998 JAN 22 15:00 138.91 80.64399 22.16968 423761 15.3
1998 JAN 22 16:00 138.84 80.60637 22.26797 398611 15.1
1998 JAN 22 17:00 138.77 80.56372 22.37928 373431 15.0
1998 JAN 22 18:00 138.69 80.51496 22.50639 348217 14.9
1998 JAN 22 18:30 138.65 80.48785 22.57697 335597 14.8
1998 JAN 22 19:00 138.61 80.45863 22.65295 322965 14.7
1998 JAN 22 19:30 138.57 80.42706 22.73499 310323 14.6
1998 JAN 22 20:00 138.52 80.39282 22.82385 297669 14.5
1998 JAN 22 20:20 138.49 80.36834 22.88732 289225 14.5
1998 JAN 22 20:40 138.45 80.34239 22.95451 280776 14.4
1998 JAN 22 21:00 138.42 80.31485 23.02577 272320 14.3
1998 JAN 22 21:20 138.38 80.28555 23.10149 263857 14.3
1998 JAN 22 21:40 138.35 80.25433 23.18210 255387 14.2
1998 JAN 22 22:00 138.31 80.22097 23.26810 246909 14.1
1998 JAN 22 22:10 138.29 80.20342 23.31329 242667 14.1
1998 JAN 22 22:20 138.27 80.18526 23.36005 238423 14.0
1998 JAN 22 22:30 138.25 80.16644 23.40845 234177 14.0
1998 JAN 22 22:40 138.22 80.14693 23.45859 229928 14.0
1998 JAN 22 22:50 138.20 80.12669 23.51057 225677 13.9
1998 JAN 22 23:00 138.18 80.10567 23.56448 221424 13.9
1998 JAN 22 23:10 138.15 80.08384 23.62044 217168 13.8
1998 JAN 22 23:20 138.13 80.06115 23.67857 212910 13.8
1998 JAN 22 23:30 138.10 80.03753 23.73900 208649 13.7
1998 JAN 22 23:40 138.08 80.01293 23.80187 204385 13.7
1998 JAN 22 23:50 138.05 79.98730 23.86733 200118 13.7
1998 JAN 23 0:00 138.02 79.96055 23.93556 195848 13.6
1998 JAN 23 0:10 138.00 79.93262 24.00672 191575 13.6
1998 JAN 23 0:20 137.97 79.90343 24.08102 187298 13.5
1998 JAN 23 0:30 137.93 79.87288 24.15866 183018 13.5
1998 JAN 23 0:40 137.90 79.84088 24.23990 178735 13.4
1998 JAN 23 0:50 137.87 79.80731 24.32497 174448 13.4
1998 JAN 23 1:00 137.83 79.77207 24.41417 170157 13.3
1998 JAN 23 1:10 137.80 79.73502 24.50781 165862 13.2
1998 JAN 23 1:20 137.76 79.69601 24.60623 161562 13.2
1998 JAN 23 1:30 137.72 79.65489 24.70982 157258 13.1
1998 JAN 23 1:40 137.68 79.61147 24.81899 152949 13.1
1998 JAN 23 1:50 137.63 79.56555 24.93422 148636 13.0
1998 JAN 23 2:00 137.59 79.51691 25.05603 144317 12.9
1998 JAN 23 2:10 137.54 79.46529 25.18502 139993 12.9
1998 JAN 23 2:20 137.48 79.41041 25.32185 135662 12.8
1998 JAN 23 2:30 137.43 79.35194 25.46727 131326 12.7
1998 JAN 23 2:40 137.37 79.28950 25.62212 126983 12.7
1998 JAN 23 2:50 137.31 79.22268 25.78738 122634 12.6
1998 JAN 23 3:00 137.24 79.15099 25.96415 118277 12.5
1998 JAN 23 3:10 137.17 79.07386 26.15369 113912 12.4
1998 JAN 23 3:20 137.09 78.99064 26.35748 109539 12.3
1998 JAN 23 3:30 137.00 78.90055 26.57721 105157 12.3
1998 JAN 23 3:40 136.91 78.80270 26.81486 100765 12.2
1998 JAN 23 3:50 136.81 78.69601 27.07278 96364 12.1
1998 JAN 23 4:00 136.70 78.57920 27.35372 91951 12.0
1998 JAN 23 4:10 136.58 78.45071 27.66099 87526 11.9
1998 JAN 23 4:20 136.44 78.30866 27.99856 83089 11.7
1998 JAN 23 4:30 136.29 78.15071 28.37125 78637 11.6
1998 JAN 23 4:40 136.12 77.97398 28.78499 74170 11.5
1998 JAN 23 4:50 135.93 77.77478 29.24714 69686 11.4
1998 JAN 23 5:00 135.71 77.54841 29.76695 65184 11.2
1998 JAN 23 5:10 135.45 77.28870 30.35627 60661 11.1
1998 JAN 23 5:20 135.15 76.98744 31.03046 56116 10.9
1998 JAN 23 5:30 134.80 76.63340 31.80984 51545 10.7
1998 JAN 23 5:40 134.37 76.21080 32.72197 46946 10.5
1998 JAN 23 5:50 133.85 75.69669 33.80509 42315 10.3
1998 JAN 23 6:00 133.20 75.05630 35.11400 37647 10.0
1998 JAN 23 6:02 133.04 74.90870 35.40941 36709 10.0
1998 JAN 23 6:04 132.88 74.75337 35.71779 35769 9.9
1998 JAN 23 6:06 132.72 74.58965 36.04004 34827 9.9
1998 JAN 23 6:08 132.54 74.41682 36.37714 33883 9.8
1998 JAN 23 6:10 132.35 74.23407 36.73016 32938 9.8
1998 JAN 23 6:12 132.15 74.04049 37.10030 31991 9.7
1998 JAN 23 6:14 131.94 73.83506 37.48885 31041 9.6 Sunglint
1998 JAN 23 6:16 131.72 73.61660 37.89726 30090 9.6 Diam.
1998 JAN 23 6:18 131.48 73.38379 38.32713 29137 9.5 Mag. km
1998 JAN 23 6:20 131.22 73.13511 38.78023 28182 9.4
1998 JAN 23 6:22 130.95 72.86882 39.25854 27225 9.3 0.1 257
1998 JAN 23 6:24 130.66 72.58291 39.76426 26265 9.3 0.0 248
1998 JAN 23 6:26 130.35 72.27504 40.29987 25303 9.2 -0.1 239
1998 JAN 23 6:28 130.01 71.94247 40.86814 24339 9.1 -0.1 230
1998 JAN 23 6:30 129.65 71.58201 41.47221 23373 9.0 -0.2 221
1998 JAN 23 6:32 129.26 71.18984 42.11561 22405 8.9 -0.3 212
1998 JAN 23 6:34 128.84 70.76142 42.80235 21434 8.8 -0.4 203
1998 JAN 23 6:36 128.38 70.29129 43.53700 20462 8.7 -0.5 193
1998 JAN 23 6:38 127.87 69.77283 44.32477 19487 8.6 -0.6 184
1998 JAN 23 6:40 127.33 69.19788 45.17163 18509 8.5 -0.7 175
1998 JAN 23 6:42 126.72 68.55634 46.08442 17530 8.4 -0.8 166
1998 JAN 23 6:44 126.06 67.83552 47.07105 16549 8.3 -1.0 156
1998 JAN 23 6:46 125.33 67.01925 48.14062 15566 8.2 -1.1 147
1998 JAN 23 6:48 124.51 66.08664 49.30362 14582 8.0 -1.2 138
1998 JAN 23 6:50 123.60 65.01014 50.57217 13597 7.9 -1.4 129
1998 JAN 23 6:52 122.58 63.75284 51.96014 12612 7.7
1998 JAN 23 6:54 121.43 62.26407 53.48327 11627 7.5
1998 JAN 23 6:56 120.12 60.47251 55.15897 10644 7.4
1998 JAN 23 6:58 118.63 58.27499 57.00564 9663 7.2
1998 JAN 23 7:00 116.91 55.51731 59.04067 8687 6.9
1998 JAN 23 7:02 114.93 51.96093 61.27558 7719 6.7
1998 JAN 23 7:04 112.60 47.22375 63.70481 6761 6.4
1998 JAN 23 7:06 109.88 40.67710 66.27970 5820 6.1
1998 JAN 23 7:08 106.64 31.29444 68.84876 4902 5.8
1998 JAN 23 7:10 102.79 17.60139 71.03135 4017 5.4
1998 JAN 23 7:12 98.19 358.52820 72.03299 3178 4.9
1998 JAN 23 7:14 92.69 336.16494 70.71313 2405 4.3
1998 JAN 23 7:16 86.17 315.99071 66.34156 1723 3.7
1998 JAN 23 7:18 78.63 301.03299 59.08633 1164 2.9
1998 JAN 23 7:20 70.26 290.60414 49.55295 764 2.1
1998 JAN 23 7:22 61.58 283.18368 38.47784 557 1.5
1998 JAN 23 7:24 53.46 277.64542 26.72255 563 1.7
1998 JAN 23 7:26 46.88 273.29635 15.17290 782 2.5
1998 JAN 23 7:28 42.51 269.72315 4.52426 1192 3.6
1998 JAN 23 7:30 40.45 266.67678 -4.85209 1759 4.5
1998 JAN 23 7:32 40.22 264.00360 -12.87804 2446 5.2
1998 JAN 23 7:34 41.16 261.60604 -19.65313 3223 5.7
1998 JAN 23 7:36 42.73 259.42008 -25.34915 4065 6.2
1998 JAN 23 7:38 44.54 257.40228 -30.14733 4952 6.6
1998 JAN 23 7:40 46.40 255.52222 -34.21045 5871 6.9
1998 JAN 23 7:42 48.20 253.75789 -37.67471 6814 7.2
1998 JAN 23 7:44 49.89 252.09292 -40.65038 7772 7.5
1998 JAN 23 7:46 51.46 250.51480 -43.22544 8740 7.7
1998 JAN 23 7:48 52.90 249.01374 -45.46986 9717 7.9
1998 JAN 23 7:50 54.21 247.58190 -47.43933 10697 8.1
1998 JAN 23 7:52 55.42 246.21290 -49.17843 11681 8.2
1998 JAN 23 7:54 56.53 244.90143 -50.72304 12666 8.4
1998 JAN 23 7:56 57.55 243.64299 -52.10228 13651 8.5
1998 JAN 23 7:58 58.48 242.43377 -53.33993 14636 8.7
1998 JAN 23 8:00 59.34 241.27041 -54.45557 15620 8.8
1998 JAN 23 8:02 60.14 240.14999 -55.46544 16603 8.9
1998 JAN 23 8:04 60.88 239.06992 -56.38309 17583 9.0
1998 JAN 23 8:06 61.57 238.02788 -57.21993 18563 9.1
1998 JAN 23 8:08 62.21 237.02176 -57.98560 19540 9.2
1998 JAN 23 8:10 62.81 236.04966 -58.68829 20514 9.3
1998 JAN 23 8:12 63.36 235.10984 -59.33504 21487 9.4
1998 JAN 23 8:14 63.89 234.20071 -59.93189 22458 9.5
1998 JAN 23 8:16 64.38 233.32077 -60.48406 23426 9.6
1998 JAN 23 8:18 64.84 232.46865 -60.99608 24392 9.7
1998 JAN 23 8:20 65.28 231.64310 -61.47191 25355 9.8
1998 JAN 23 8:22 65.69 230.84290 -61.91504 26317 9.8
1998 JAN 23 8:24 66.08 230.06695 -62.32849 27276 9.9
1998 JAN 23 8:26 66.45 229.31419 -62.71498 28234 10.0
1998 JAN 23 8:28 66.80 228.58365 -63.07688 29189 10.0
1998 JAN 23 8:30 67.14 227.87440 -63.41631 30142 10.1
1998 JAN 23 8:32 67.45 227.18556 -63.73517 31093 10.2
1998 JAN 23 8:34 67.76 226.51630 -64.03515 32042 10.2
1998 JAN 23 8:36 68.04 225.86585 -64.31776 32989 10.3
1998 JAN 23 8:38 68.32 225.23345 -64.58436 33934 10.4
1998 JAN 23 8:40 68.58 224.61841 -64.83619 34878 10.4
1998 JAN 23 8:42 68.83 224.02005 -65.07435 35819 10.5
1998 JAN 23 8:44 69.08 223.43774 -65.29985 36759 10.5
1998 JAN 23 8:46 69.31 222.87088 -65.51359 37698 10.6
1998 JAN 23 8:48 69.53 222.31889 -65.71642 38634 10.6
1998 JAN 23 8:50 69.74 221.78122 -65.90908 39569 10.7
1998 JAN 23 8:52 69.95 221.25736 -66.09227 40503 10.7
1998 JAN 23 8:54 70.14 220.74679 -66.26662 41434 10.8
1998 JAN 23 8:56 70.33 220.24905 -66.43270 42365 10.8
1998 JAN 23 8:58 70.52 219.76369 -66.59105 43294 10.9
1998 JAN 23 9:00 70.69 219.29026 -66.74216 44221 10.9
1998 JAN 23 9:10 71.49 217.08833 -67.40357 48839 11.1
1998 JAN 23 9:20 72.17 215.12977 -67.93854 53426 11.3
1998 JAN 23 9:30 72.75 213.37772 -68.37811 57986 11.5
1998 JAN 23 9:40 73.26 211.80216 -68.74424 62522 11.6
1998 JAN 23 9:50 73.70 210.37844 -69.05283 67035 11.8
1998 JAN 23 10:00 74.10 209.08617 -69.31563 71530 11.9
1998 JAN 23 10:10 74.45 207.90833 -69.54151 76006 12.0
1998 JAN 23 10:20 74.77 206.83069 -69.73727 80467 12.1
1998 JAN 23 10:30 75.06 205.84119 -69.90817 84913 12.3
1998 JAN 23 10:40 75.32 204.92961 -70.05838 89345 12.4
1998 JAN 23 10:50 75.56 204.08724 -70.19121 93764 12.5
1998 JAN 23 11:00 75.78 203.30656 -70.30931 98172 12.6
1998 JAN 23 11:10 75.98 202.58112 -70.41486 102570 12.7
1998 JAN 23 11:20 76.17 201.90532 -70.50962 106957 12.7
1998 JAN 23 11:30 76.34 201.27426 -70.59508 111335 12.8
1998 JAN 23 11:40 76.50 200.68367 -70.67244 115705 12.9
1998 JAN 23 11:50 76.65 200.12983 -70.74274 120066 13.0
1998 JAN 23 12:00 76.79 199.60940 -70.80685 124420 13.1
1998 JAN 23 12:10 76.92 199.11949 -70.86548 128767 13.1
1998 JAN 23 12:20 77.05 198.65748 -70.91928 133106 13.2
1998 JAN 23 12:30 77.16 198.22108 -70.96878 137440 13.3
1998 JAN 23 12:40 77.27 197.80821 -71.01444 141768 13.3
1998 JAN 23 12:50 77.38 197.41702 -71.05667 146089 13.4
1998 JAN 23 13:00 77.48 197.04587 -71.09582 150406 13.5
1998 JAN 23 13:10 77.57 196.69324 -71.13218 154717 13.5
1998 JAN 23 13:20 77.66 196.35779 -71.16604 159024 13.6
1998 JAN 23 13:30 77.74 196.03830 -71.19762 163326 13.6
1998 JAN 23 13:40 77.82 195.73364 -71.22713 167623 13.7
1998 JAN 23 13:50 77.90 195.44282 -71.25476 171916 13.8
1998 JAN 23 14:00 77.97 195.16491 -71.28068 176205 13.8
1998 JAN 23 14:20 78.11 194.64453 -71.32791 184772 13.9
1998 JAN 23 14:40 78.24 194.16658 -71.36984 193325 14.0
1998 JAN 23 15:00 78.35 193.72607 -71.40726 201865 14.1
1998 JAN 23 15:20 78.46 193.31876 -71.44081 210392 14.2
1998 JAN 23 15:40 78.56 192.94104 -71.47105 218909 14.3
1998 JAN 23 16:00 78.65 192.58978 -71.49842 227415 14.4
1998 JAN 23 16:20 78.74 192.26230 -71.52328 235911 14.4
1998 JAN 23 16:40 78.82 191.95625 -71.54595 244399 14.5
1998 JAN 23 17:00 78.90 191.66959 -71.56669 252878 14.6
1998 JAN 23 17:20 78.97 191.40053 -71.58572 261349 14.6
1998 JAN 23 17:40 79.04 191.14749 -71.60324 269812 14.7
1998 JAN 23 18:00 79.11 190.90908 -71.61942 278269 14.8
1998 JAN 23 18:20 79.17 190.68407 -71.63439 286719 14.8
1998 JAN 23 18:40 79.23 190.47135 -71.64828 295162 14.9
1998 JAN 23 19:00 79.28 190.26994 -71.66119 303600 15.0
1998 JAN 23 19:20 79.33 190.07896 -71.67323 312032 15.0
1998 JAN 23 19:40 79.39 189.89761 -71.68447 320458 15.1
1998 JAN 23 20:00 79.43 189.72518 -71.69499 328879 15.1
1998 JAN 23 20:30 79.50 189.48187 -71.70955 341502 15.2
1998 JAN 23 21:00 79.57 189.25527 -71.72281 354115 15.3
1998 JAN 23 21:30 79.63 189.04371 -71.73495 366719 15.4
1998 JAN 23 22:00 79.69 188.84573 -71.74608 379313 15.4
1998 JAN 23 22:30 79.74 188.66006 -71.75632 391899 15.5
1998 JAN 23 23:00 79.79 188.48559 -71.76578 404477 15.6
1998 JAN 23 23:30 79.84 188.32132 -71.77454 417048 15.7
1998 JAN 24 0:00 79.89 188.16638 -71.78267 429611 15.7