| Parameter |
Value |
| Designation |
C/1975 X1 (Sato) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1976-01-03T22:01:50.992320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:24Z |
| Obs used |
72 |
| NEO |
- |
| M1 |
11.100 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1975-12-19.0000000 |
| e |
1.00150800 |
| q (au) |
0.863970 |
| a (au) |
-572.924348 |
| i (deg) |
93.957122 |
| Ω (om, deg) |
281.495433 |
| ω (w, deg) |
215.462906 |
| M (ma, deg) |
-0.001144 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.258 + 5.272\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.258 |
| n |
5.272 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
1.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
18:37:51.12 |
-00:01:26.1 |
HIP 91322 |
17.54 |
| 2026-06-01 12:00 |
18:37:49.78 |
-00:01:22.6 |
HIP 91322 |
17.53 |
| 2026-06-02 00:00 |
18:37:48.42 |
-00:01:19.2 |
HIP 91322 |
17.53 |
| 2026-06-02 12:00 |
18:37:47.07 |
-00:01:15.8 |
HIP 91322 |
17.52 |
| 2026-06-03 00:00 |
18:37:45.70 |
-00:01:12.5 |
HIP 91322 |
17.53 |
| 2026-06-03 12:00 |
18:37:44.33 |
-00:01:09.3 |
HIP 91322 |
17.54 |
| 2026-06-04 00:00 |
18:37:42.96 |
-00:01:06.1 |
HIP 91322 |
17.55 |
| 2026-06-04 12:00 |
18:37:41.58 |
-00:01:03.0 |
HIP 91322 |
17.57 |
| 2026-06-05 00:00 |
18:37:40.19 |
-00:01:00.0 |
HIP 91322 |
17.60 |
| 2026-06-05 12:00 |
18:37:38.80 |
-00:00:57.1 |
HIP 91322 |
17.63 |
| 2026-06-06 00:00 |
18:37:37.40 |
-00:00:54.3 |
HIP 91322 |
17.66 |
| 2026-06-06 12:00 |
18:37:36.00 |
-00:00:51.5 |
HIP 91322 |
17.71 |
| 2026-06-07 00:00 |
18:37:34.59 |
-00:00:48.8 |
HIP 91322 |
17.76 |
| 2026-06-07 12:00 |
18:37:33.18 |
-00:00:46.2 |
HIP 91322 |
17.81 |
| 2026-06-08 00:00 |
18:37:31.76 |
-00:00:43.6 |
HIP 91322 |
17.87 |
| 2026-06-08 12:00 |
18:37:30.34 |
-00:00:41.1 |
HIP 91322 |
17.94 |
| 2026-06-09 00:00 |
18:37:28.91 |
-00:00:38.7 |
HIP 91322 |
18.01 |
| 2026-06-09 12:00 |
18:37:27.48 |
-00:00:36.4 |
HIP 91322 |
18.08 |
| 2026-06-10 00:00 |
18:37:26.04 |
-00:00:34.1 |
HIP 91322 |
18.17 |
| 2026-06-10 12:00 |
18:37:24.60 |
-00:00:32.0 |
HIP 91322 |
18.25 |
| 2026-06-11 00:00 |
18:37:23.15 |
-00:00:29.9 |
HIP 91322 |
18.35 |
| 2026-06-11 12:00 |
18:37:21.70 |
-00:00:27.8 |
HIP 91322 |
18.45 |
| 2026-06-12 00:00 |
18:37:20.25 |
-00:00:25.9 |
HIP 91322 |
18.55 |
| 2026-06-12 12:00 |
18:37:18.79 |
-00:00:24.0 |
HIP 91322 |
18.67 |
| 2026-06-13 00:00 |
18:37:17.33 |
-00:00:22.2 |
HIP 91322 |
18.78 |
| 2026-06-13 12:00 |
18:37:15.86 |
-00:00:20.5 |
HIP 91322 |
18.90 |
| 2026-06-14 00:00 |
18:37:14.39 |
-00:00:18.9 |
HIP 91322 |
19.03 |
| 2026-06-14 12:00 |
18:37:12.91 |
-00:00:17.3 |
HIP 91322 |
19.16 |
| 2026-06-15 00:00 |
18:37:11.44 |
-00:00:15.8 |
HIP 91322 |
19.30 |
| 2026-06-15 12:00 |
18:37:09.96 |
-00:00:14.4 |
HIP 91322 |
19.44 |
| 2026-06-16 00:00 |
18:37:08.47 |
-00:00:13.1 |
HIP 91322 |
19.59 |
| 2026-06-16 12:00 |
18:37:06.98 |
-00:00:11.8 |
HIP 91322 |
19.74 |
| 2026-06-17 00:00 |
18:37:05.49 |
-00:00:10.7 |
HIP 91322 |
19.90 |
| 2026-06-17 12:00 |
18:37:04.00 |
-00:00:09.6 |
HIP 91322 |
20.06 |
| 2026-06-18 00:00 |
18:37:02.50 |
-00:00:08.5 |
HIP 91322 |
20.23 |
| 2026-06-18 12:00 |
18:37:01.01 |
-00:00:07.6 |
HIP 91322 |
20.40 |
| 2026-06-19 00:00 |
18:36:59.50 |
-00:00:06.7 |
HIP 91322 |
20.58 |
| 2026-06-19 12:00 |
18:36:58.00 |
-00:00:05.9 |
HIP 91322 |
20.76 |
| 2026-06-20 00:00 |
18:36:56.49 |
-00:00:05.2 |
HIP 91322 |
20.95 |
| 2026-06-20 12:00 |
18:36:54.99 |
-00:00:04.6 |
HIP 91322 |
21.14 |
| 2026-06-21 00:00 |
18:36:53.48 |
-00:00:04.0 |
HIP 91322 |
21.33 |
| 2026-06-21 12:00 |
18:36:51.96 |
-00:00:03.6 |
HIP 91322 |
21.53 |
| 2026-06-22 00:00 |
18:36:50.45 |
-00:00:03.2 |
HIP 91322 |
21.73 |