Contents.
planet: 6 - Saturn
satellites: S1 - Mimas: 841,
S2 - Enceladus: 2247,
S3 - Tethys: 4343,
S4 - Dione: 4093,
S5 - Rhea: 4077,
S6 - Titan: 4564,
S7 - Hyperion: 2490,
S8 - Iapetus: 3738,
total number: 26393
type: relative, absolute
dates: 1874-1989
observatory: 077 - Yale-Columbia Station, Johannesburg ;
078 - Johannesburg;
084 - Pulkovo;
089 - Nikolaev;
094 - Crimea-Simeis;
097 - Wise Observatory, Mitzpeh Ramon;
114 - Engelhardt Observatory, Zelenchukskaya Station;
119 - Abastuman;
129 - Ordubad;
136 - Engelhardt Observatory, Kasan;
286 - Yunnan Observatory;
387 - Tokyo-Dodaira;
501 - Herstmonceux;
536 - Berlin-Babelsberg;
559 - Serra La Nave;
673 - Table Mountain Observatory, Wrightwood;
688 - Lowell Observatory, Anderson Mesa Station;
690 - Lowell Observatory, Flagstaff;
702 - Joint Obs. for cometary research, Socorro;
711 - McDonald Observatory, Fort Davis;
754 - Yerkes Observatory, Williams Bay;
780 - Leander McCormick Observatory, Charlottesville;
786 - U.S. Naval Obs., Washington (since 1893);
787 - U.S. Naval Obs., Washington (before 1893);
801 - Oak Ridge Observatory;
809 - European Southern Observatory, La Silla;
950 - La Palma;
999 - Bordeaux-Floirac;
Reference.
0 - Strugnell P. R., Taylor D. B., (1990)
A catalogue of ground-based observations of the eight major
satellites of Saturn, 1874-1989
Astronomy and Astrophysics Supplement Series
V. 83. N. 2. P. 289-300.
1990A&AS___83__289S
1 - USNO, (1877-1887)
Astronomical and meteorological observations made during
the year ... at the U.S.Naval Observatory
Telescope - refractor, D = 26 inch
2 - USNO, (1887, 1889-1893)
Observations made during
the year ... at the U.S.Naval Observatory
Telescope - refractor, D = 26 inch
3 - USNO, (1911)
Equatorial observations, 1893-1907
Publications of U.S.Naval Observatory, 2nd Series
V. 6. P. A3-A5.
1911PUSNO___6___A3U
Telescope - refractor, D = 26 inch
4 - USNO, (1929)
Observations of Satellites: Satellites of Mars.
Publications of U.S.Naval Observatory, 2nd Series
V. 12. P. 81-89.
1929PUSNO__12_____U
Telescope - refractor, D = 26 inch
5 - USNO, (1954)
Observations of satellites made with the 26-inch equatorial
of the U.S.Naval observatory. 1928-47.
Publications of the U.S.Naval Observatory, 2nd Series
V. 17. N. 3. P. 125-126.
1954PUSNO__17__125U
Telescope - refractor, D = 26 inch
6 - Struve G., (1933)
Neue Untersuchungen im Saturnsystem
Veroffentlichungen der Universitatssternwarte zu
Berlin-Babelsberg
V. 6.
1933VUSBB___6_____S
Observers - H.Struve, G.Struve, Bernewitz, Pavel.
Telescope - 65-cm refractor
7 - Struve G., (1933)
Neue Untersuchungen im Saturnsystem
Veroffentlichungen der Universitatssternwarte zu
Berlin-Babelsberg
V. 6.
1933VUSBB___6_____S
Observers - H.Struve, G.Struve, Bernewitz, Pavel.
Telescope - 66-cm refractor
8 - Struve G., (1933)
Neue Untersuchungen im Saturnsystem
Veroffentlichungen der Universitatssternwarte zu
Berlin-Babelsberg
V. 6.
1933VUSBB___6_____S
Observers - H.Struve, G.Struve, Bernewitz, Pavel.
Telescope - 40-inch refractor.
9 - Struve H., (1898)
Beobachtungen der Saturnstrabanten am 30-zolligen Pulkowaer refractor
Publications de l'Observatoire Central Nicolas. Serie 2
V. 11. P. 1-337.
1898PuOCN__11____1S
Observer: H.Struve.
Telescopes: 30-inch refractor
10 - Alden H.L., O'Cornel W.C., (1928)
Photographic measures of the satellites of Saturn in 1926
Astronomical journal
V. 38. N. 7. P. 53-56.
1928AJ_____38___53A
Observers: Alden H L, O'Colonnel W C.
Telescope: 26-inch photographic refractor
11 - Alden H.L., (1929)
Photographic measures of the satellites of Saturn in 1927
Astronomical Journal
V. 40. N. 941. P. 88-90.
1929AJ_____40___88A
Observers: Alden H L, O'Colonnel W C.
Telescope: 26-inch photographic refractor
12 - Soulie G, (1968)
Positions de grosses planetes et de leurs satellites et de la Lune
Journal des observateurs
V. 51. P. 315-323.
1968JdesO__51__315S
Observer: Soulie G.
Telescopes: 30 cm refractor
13 - Chernykh L. I., Chernykh N. S., (1971)
Observations of the planet Pluto, minor planets 10 Hygiea
433 Eros, VII, VIII and IX satellites of Saturn made at the
krimean astrophysical observatory of the sovjet academi of
science.
Institut teoreticheskoi astronomii (Institut for theoretical
astronomy), Bulleten.
V. 12. N. 8. P. 739-741.
1971BITA___12__739C
Telescope - astrograph, D = 40 cm
14 - Soulie G., (1972)
Positions de grosses planetes et de la Lune observees
a l'equatorial photographique de 0,33 m
Astronomy and Astrophysics Supplement Series
V. 6. P. 311-326.
1972A&AS____6__311S
Observer: Soulie G.
Telescope: 13-inch photographic refractor
15 - Soulie G., (1975)
Positions of the major planets and the moon observed
at the photographic equatorial of 0.33 m. In french
Astronomy and Astrophysics Supplement Series
V. 22. P. 49-61.
1975A&AS___22___49S
Observer: Soulie G.
Telescope: 33-cm refractor
16 - Peters C.F., (1973)
Table Mountain satellite observations: 1971-72
Astronomical Journal
V. 78. N. 9. P. 957-958.
1973AJ_____78__957P
Observer: Peters F C.
Telescope: 24-inch reflector.
17 - Soulie G., (1975)
Positions of the major planets and the moon observed
at the photographic equatorial of 0.33 m. In french
Astronomy and Astrophysics Supplement Series
V. 22. P. 49-61.
1975A&AS___22___49S
Observer: Soulie G.
Telescope: 38-cm refractor
18 - Kiseleva T. P., Panova G. V., Kalinichenko O. A., (1977)
Photographic position observations of Saturn and its satellites
in 1971-1974 at Pulkovo. In russian.
Glavnaia Astronomicheskaia Observatoriia, Izvestiia
N. 195. P. 49-66.
1977IzPul_195___49K
Observers: Kiseleva T. P., Panova G. V., Kalinichenko O. A.
Telescopes: 26-inch refractor
19 - Kiseleva T. P., Panova G. V., Kalinichenko O. A., (1977)
Photographic position observations of Saturn and its satellites
in 1971-1974 at Pulkovo. In russian.
Glavnaia Astronomicheskaia Observatoriia, Izvestiia
N. 195. P. 49-66.
1977IzPul_195___49K
Observers: Kiseleva T. P., Panova G. V., Kalinichenko O. A.
Telescopes: normal astrograph
20 - Kiseleva T. P., Panova G. V., Kalinichenko O. A., (1977)
Photographic position observations of Saturn and its satellites
in 1971-1974 at Pulkovo. In russian.
Glavnaia Astronomicheskaia Observatoriia, Izvestiia
N. 195. P. 49-66.
1977IzPul_195___49K
Observers: Kiseleva T. P., Panova G. V., Kalinichenko O. A.
Telescopes: AKD(double short-focus astrograph)
21 - Abbot R.I., Mulholland J.D., Shelus P.J., (1975)
Astrometric observations of Saturn's satellites
from McDonald Observatory, 1972
Astronomical Journal, Sept. 1975
V. 80. P. 723-728.
1975AJ_____80__723A
Observers: Abbot R.I., Mulholland J.D., Shelus P.J.
Telescopes: 2.1 m reflector, 76 cm eflector. Meas.machine: Mann measures
22 - Abbot R.I., Mulholland J.D., Shelus P.J., (1975)
Astrometric observations of Saturn's satellites
from McDonald Observatory, 1972
Astronomical Journal, Sept. 1975
V. 80. P. 723-728.
1975AJ_____80__723A
Observers: Abbot R.I., Mulholland J.D., Shelus P.J.
Telescopes: 2.1 m reflector, 76 cm eflector. Meas.machine: PDS measures
23 - Kiseleva T.P., Koroleva L.S., Panova G.V., (1975)
The positional photographic observations of the satellites
of Saturn with the normal astrograph in 1972 at Pulkovo
Institut Teoreticheskoi Astronomii Biulleten
V. 14. N. 1. P. 60-62.
1975BITA___14___60K
Observers: Kiseleva T P, Koroleva L S, Panova G V.
Telescope: normal astrograph.
24 - Soulie G., (1978)
Positions of asteroids, major planets, and the moon. In french
Astronomy and Astrophysics Supplement Series
V. 33. P. 257-264.
1978A&AS___33__257S
Observer: Soulie G.
Telescope: 33-cm refractor
25 - Sinclair A.T., (1974)
A theory of the motion of Iapetus
Royal Astronomical Society, Monthly Notices
V. 169. P. 591-605.
1974MNRAS_169__591S
Sinclair A.T., (1977)
The orbits of Tethys, Dione, Rhea, Titan and Iapetus
Royal Astronomical Society, Monthly Notices
V. 180. P. 447-459.
1977MNRAS_180__447S
Observer: Sinclair A.T.
Telescope: 13-inch refractor.
26 - Sinclair A.T., (1974)
A theory of the motion of Iapetus
Royal Astronomical Society, Monthly Notices
V. 169. P. 591-605.
1974MNRAS_169__591S
Sinclair A.T., (1977)
The orbits of Tethys, Dione, Rhea, Titan and Iapetus
Royal Astronomical Society, Monthly Notices
V. 180. P. 447-459.
1977MNRAS_180__447S
Observer: Sinclair A.T.
Telescope: 26-inch refractor
27 - Mulholland J.D., Shelus P.J., Abbot R.I., (1976)
Astrometric observations of satellites
of Jupiter and Saturn during 1973
Astronomical Journal
V. 81. P. 1007-1009.
1976AJ_____81_1007M
Observers: Shelus P J, Abbot R I.
Telescope: 76-cm reflector
28 - Soulie G., (1978)
Positions of asteroids, major planets, and the moon. In french
Astronomy and Astrophysics Supplement Series
V. 33. P. 257-264.
1978A&AS___33__257S
Observer: Soulie G.
Telescope: 38-cm refractor
29 - Gorel G.K., (1977)
Results of astrometrical observations of satellites
of Saturn made in Nikolaev with zone astrograph in 1973-1976
Scientific paper deposited in All-russian institute
of scientific and technical information
N. 3513-78. P. 1-11.
1977PDRII3513_____G
Observer: Gorel.
Telescope: Zone astrograph
30 - Tolbin S.V., (1987)
Results of postional photographic observations of the Saturn
system using the Pulkovo normal astrograph during 1974-1975.
In russian
Pulkovo, Glavnaia Astronomicheskaia Observatoriia, Izvestiia
N. 204. P. 65-69.
1987IzPul_204___65T
Observer: Tolbin S.V.
Telescope: Pulkovo normal astrograph.
ATTENTION: The observations of this source were DELETED from
this potion as they are in the portion sm0010.
31 - Pascu D., (1982)
Data held at U. S. Naval Observatory, Washington, D.C.
Observer: Pascu D.
Telescope - 26 inch refractor
32 - Levitskaya T.I., (1979)
Position photographical observations of satellites
of Saturn in Octobre-Novenbre 1975
Astron Tsirk USSR
N. 1084. P. 6-8.
1979ATsir1084____6L
Observatory: Ordubad.
Observer: Levitskaya T.I.
Telescope: lunar-planet telescope, D=700 mm, F=10313 mm
33 - Tolbin S.V., (1985)
Results of positional photographic observations of the Saturn's
system made in Pulkovo on 26" refractor in 1975
Scientific paper deposited in All-russian institute
of scientific and technical information
N. 2267-85. P. 1-15.
1985PDRII2267_____T
Observers: Tolbin S.V.
Telescope: 26" refractor
Telescope: Pulkovo normal astrograph.
ATTENTION: The observations of this source were DELETED from
this potion as they are in the portion sm0011.
34 - Mulholland J. D., Shelus P. J., (1980)
Astrometric observations of the satellites of Saturn during 1975-1976
Astronomical Journal, Aug. 1980
V. 85. P. 1112-1116.
1980AJ_____85_1112M
Telescope - reflector, D = 2.1 m
35 - Soulie G., Dupouy Mr., Teulet Mr., Broqua Mr., Dulou Mr., (1981)
Positions of asteroids, the planets, and the moon. In french
Astronomy and Astrophysics Supplement Series
V. 43. P. 147-153.
1981A&AS___43__147S
Observatory: Bordeaux.
Observers: Soulie G., Dupouy Mr., Teulet Mr., Broqua Mr., Dulou Mr.
Telescope: 33 cm refractor
36 - Voronenko V.I., Gorel G.K., (1982)
Photographic observations of satellites of Jupiter and Saturn
made in Nikolaev 1976-1979
Scientific paper deposited in All-russian institute of scientific
and technical information
N. 1171-82. P. 1-17.
1982PDRII1171_____V
Observers: Voronenko, Gorel.
Telescope: Zone astrograph
37 - Seitzer P., Ianna P. A., (1980)
Astrometric observations of satellites of the outer
planets. IV - The satellites of Saturn during 1977
Astronomical Journal, Aug. 1980
V. 85. P. 1117-1121.
1980AJ_____85_1117S
Observers: Seitzer P, Ianna P A.
Telescope: 67- refractor
38 - Chugunov I.G., (1981)
Observations of satellites of Saturn made at Engelgardt
astronomical observatory in 1977-1978
Izvestija Astronomiceskoj Observatorii im. V.P. Engel'gardta (Kazan')
N. 47. P. 111-115.
1981IzAOE__47__111C
Observer: Chugunov I G.
Telescope: 16-inch astrograph.
39 - Taylor D.B., Sinclair A.T., (1985)
Positions of the satellites of Saturn in 1978, 1982 and 1983
obtained at the Royal Greenwich Observatory
Astronomy and Astrophysics Supplement Series
V. 61. P. 221-223.
1985A&AS___61__221T
Observers: Taylor D.B., Sinclair A.T.
Telescope: 26-inch refractor.
40 - Seitzer P., Ianna P.A., Levinson F., (1979)
Astrometric observations of satellites of the outer planets.
II - The Saturnian system during 1978
Astronomical Journal
V. 84. P. 877-882.
1979AJ_____84__877S
Observers: Seitzer P, Ianna P A, Levinson F.
Telescope: 67 cm -refractor
41 - Chugunov I.G., Nefed'ev Yu. A, (1980)
Photographic observations of satellites of Saturn
Astron Tsirk USSR
N. 1114. P. 7-8.
1979ATsir1114____7C
Observers: Chugunov I.G., Nefed'ev Yu.A.
Telescope: 16-inch astrograph.
42 - Aksnes K., Franklin F., Millis R., Birch P., Blanco C.,
Catalano S., and Piironen J., (1984)
Mutual phenomena of the Galilean and Saturnian satellites
in 1973 and 1979/1980
Astronomical Journal
V. 89. P. 280-288.
1984AJ_____89__280A
Observers: Aksnes K., Franklin F., Millis R., Birch P., Blanco C.,
Catalano S., and Piironen J.
Telescope: 26" refractor
43 - Rohde J.R., Ianna P.A., Stayton L.C., Levinson F.H., (1982)
Astrometric observations of the satellites of the outer planets.
V - The oppositions of 1978-1979, 1980, and 1981
Astronomical Journal
V. 87. P. 698-717.
1982AJ_____87__698R
Observers: Rohde J R, Ianna P A, Stayton L C, Levinson F H.
Telescope: 67- refractor.
44 - Voronenko V.I., and Gorel G.K., (1986)
Photographic observations of Jupiter's and Saturn's satellites
made in Nikolaev in 1980-1982. Communication 5
Scientific paper deposited in All-russian institute of scientific
and technical information
N. 5691-B. P. 1-92.
1986PDRII5691_____V
Observers: Voronenko, Gorel.
Telescope: Zone astrograph
45 - Kitkin B.N., and Chugunov I.G., (1980)
Photographical observations of satellites of Saturn
made at Engelgardt astronomical observatory in January-May 1980
Scientific paper deposited in All-russian institute of scientific
and technical information
N. 4997-80. P. 1-12.
1980PDRII4997_____K
Observers: Kitkin B.N., Chugunov I.G.
Telescope: 16"astrograph
46 - Dourneau G., Le Campion J.F., Dulou M.R., (1989)
Astrometric observations and comparison with theory of Saturn's
satellites from Bordeaux Observatory, 1984
Astronomical Journal
V. 98. P. 716-722.
1989AJ_____98__716D
Observers: Dourneau G., Le Campion J. F., Dulou M. R.
Telescope: 38 cm refractor.
47 - Dourneau G., Veillet, (?)
Personal communication
Telescope: 1 m reflector.
48 - Dourneau G., Veillet, (?)
Personal communication
Telescope: 1.5 m reflector.
49 - Dourneau G., Veillet, (?)
Personal communication
Telescope: 3.6 m reflector.
50 - Debehogne H., (1981)
Saturn VII (Hyperion)
Observations obtained at the European Southern Observatory
IAU Circ., 3654 (1981)
N. 3654.
1981IAUC_3654_____D
Debehogne H., (1982)
Observations of Saturn VIII (Iapetus) obtained at the European
Southern Observatory
IAU Circ., 3707 (1982)
N. 3707.
1982IAUC_3707_____D
Observer: Debehogne H.
Telescope: 40-cm refractor.
51 - Kitkin V.N., Chugunov I.G., (1982)
Photographic observations of satellites of Saturn made
at Engelgardt astronomical observatory in January-May 1981
Scientific paper deposited in All-russian institute of scientific
and technical information
N. 1131-82. P. 1-7.
1982PDRII1131_____K
Observers: Kitkin B.N., Chugunov I.G.
Telescope: 16"astrograph.
52 - Dourneau G., Dulou M.R., Le Campion J.F., Veillet C., (1986)
Astrometric observations of Saturn's satellites made at the ESO
in 1981 and comparison with theory. In french
Astronomy and Astrophysics
V. 160. N. 2. P. 280-286.
1986A&A___160__280D
Observers: Dourneau G., Dulou M.R., Le Campion J.F., Veillet C.
Telescope: 1.5 m reflector.
53 - Dourneau G., Dulou M.R., Le Campion J.F., (1985)
Astrometric observations and comparison with the theory
of Saturn's satellites conducted at the Bordeaux Observatory
with the 38-cm refracting telescope during the oppositions
of 1981 and 1982. In french
Astronomy and Astrophysics
V. 142. N. 1. P. 91-99.
1985A&A___142___91D
Observers: Dourneau G., Dulou M.R., Le Campion J.F.
Telescope: 38 cm reflector.
54 - Bowell E., (1982)
Saturn VIII (Iapetus)
The following precise positions have been measured by E.Bowell
from exposures obtained at the Lowell Observatory's Anderson
Mesa station
IAU Circ., 3719
N. 3719.
1982IAUC_3719_____B
Observer: Bowell E.
Telescope: 13-inch refractor.
55 - Debehogne H, (1984)
Observations photographiques des satellites de Saturne
effectue en 1982 a l'equatorial GPO de 40 cm de l'Observatoire
Austral Europeen (ESO) a la Silla (Chili)
Bulletin of the Astronomical Observatoire Royale de Belgique
V. 9. N. 6. P. 299-306.
1984BAORB___9__299D
Observer: Debehogne H.
Telescope: 40-cm equatorial.
56 - Kitkin V.N., (1985)
Observations of satellites of Saturn made at Engelgardt
astronomical observatory and the Zelenchukskaia Astronomical
station in 1982-1984
Scientific paper deposited in All-russian institute of scientific
and technical information
N. 893-B. P. 1-10.
1985PDRII_893_____K
Observers: Kitkin B.N.
Telescope: 16"astrograph.
57 - Kitkin V.N., (1985)
Observations of satellites of Saturn made at Engelgardt
astronomical observatory and the Zelenchukskaia Astronomical
station in 1982-1984
Scientific paper deposited in All-russian institute of scientific
and technical information
N. 893-B. P. 1-10.
1985PDRII_893_____K
Observers: Kitkin B.N.
Telescope: Zeiss astrograph
58 - Kiseleva T.P., Chanturiia S.M., Lepeshenkova S.A.,
Lapina E.V., Suleimanova E.V., (1987)
Photographic positional observations of Jupiter, Saturn,
and their satellites in Abastumani during 1983-1984. In russian
Abastumanskaia Astrofizicheskaia Observatoriia, Biulleten'
N. 62. P. 117-130.
1987AbOB___62__117K
Observers: Kiseleva T. P., Chanturiia S. M., Lepeshenkova S. A.,
Lapina E.V., Suleimanova E. V.
Telescope: Zeiss Double Astrograph.
59 - Rapaport M. (1989)
Personal communication
Observers: Rapaport M.
Telescope: Meridian circle
60 - (1989)
Carlsberg Meridian catalogue La Palma. Number 4:
Observations of positions of stars and planets:
May 1984 to February 1988
V. 4. P. 667-668.
1989N91-12434______
Observer: personnel of the observatory.
Telescope: Carlsberg automatic meridian circle.
61 - Chen (1987)
Personal communication
Observers: Shen
Telescope: 1 m refractor
Informations.
relative to: 0 - planet: 8880,
S1 - Mimas: 897,
S2 - Enceladus: 1698,
S3 - Tethys: 5373,
S4 - Dione: 2374,
S5 - Rhea: 4888,
S6 - Titan: 2232,
S7 - Hyperion: 12,
S8 - Iapetus: 70,
reference frame: astrometric
centre of frame: 0 - topocenter,
1 - geocenter,
2 - heliocenter
epoch of equinox: 0 - B1950.0,
1 - date,
2 - J2000.0,
time scale: UTC
reduction: no information
coordinates: 0 - absolute (alpha, delta),
1 - X, Y,
2 - differential (Delta alpha, Delta delta),
3 - position angle, separation,
diff. refraction: no information (see in publications)
receptor: photographic, meridian, micrometric, visual
telescope: see in references
observers: see in references
data included in standard data file: yes
Comments.
For observations type 0, alpha and delta
are given in degees to 6 decimal places.
For type 1, Delta alpha, Delta delta
are given in seconds of arc to 3 decimal
places.
Type 2 are similar to type 1 exept
Delta alpha is in seconds of time.
For type 3 obsrvations the position angle, P,
is in degrees measured eastwards from north.
The separation, S, is in secons of arc.
Both P and S are given to 3 decimal places.
evaluation: Residuals are given for X, Y in seconds of arc.
For absolute and differetial coordinates
and for position angle the residual
is converted to residual in X, Y.
The value 0.0 may be given if the residual
were not computed. Any residual greater than
2.0 seconds of arc is given as 99.9 .
Format.
1. Column 1- 3. Opposition number (1 - 1874, 112 - 1989)
2. Column 5- 8. Year of observation
3. Column 10-11. Month of observation
4. Column 13-21. UTC date of observation (DD.dddddd)
5. Column 23-26. ET-UTC in secons to the nearest tenth of a second
6. Column 28-30. Observatory code (see above)
7. Column 32-33. Reference code (see above)
8. Column 35. Observation type (see coordinates:)
9. Column 37-38. Subject satellite, reference satellite
(see relative to:)
For absolute coordinates number of
reference satellite is 0 or
column 38 left blank
10. Column 40. Presence flag for first observation of pair
(0 - observation absent, 1 - observation present)
11. Column 41. Presence flag for second observation of pair
(0 - observation absent, 1 - observation present)
12. Column 42-53. First observation of pair
(0.000000 if presence flag is 0)
13. Column 54-65. Second observation of pair
(0.000000 if presence flag is 0)
14. Column 67. Epoch of equinox (see above)
15. Column 69. Centre of frame (see above)
16. Column 71-74. Residual for first observation of pair
(0.0 if presence flag is 0)
17. Column 76-79. Residual for second observation of pair
(0.0 if presence flag is 0)
-------------------------------------------------------------------
Opposition number
Year of observation
Month of observation
UTC date of observation (DD.dddddd)
ET-UTC in secons to the nearest tenth of a second
Observatory code (see above)
Reference code (see above)
Observation type
Subject satellite
Reference satellite
Presence flag for first observation
Presence flag for second observation
First observation
Second observation
Epoch of equinox ->
Centre of frame ->
Residual for first observation ->
Residual for second observation ->
------------------------------------------------------------------------------