| 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) |
| 2026-03-26 00:00 |
18:39:23.22 |
-00:17:40.9 |
HIP 91352 |
22.33 |
| 2026-03-26 12:00 |
18:39:23.34 |
-00:17:31.4 |
HIP 91352 |
22.40 |
| 2026-03-27 00:00 |
18:39:23.45 |
-00:17:21.9 |
HIP 91352 |
22.46 |
| 2026-03-27 12:00 |
18:39:23.54 |
-00:17:12.5 |
HIP 91352 |
22.53 |
| 2026-03-28 00:00 |
18:39:23.62 |
-00:17:03.0 |
HIP 91352 |
22.59 |
| 2026-03-28 12:00 |
18:39:23.69 |
-00:16:53.6 |
HIP 91352 |
22.65 |
| 2026-03-29 00:00 |
18:39:23.74 |
-00:16:44.2 |
HIP 91352 |
22.71 |
| 2026-03-29 12:00 |
18:39:23.78 |
-00:16:34.8 |
HIP 91352 |
22.76 |
| 2026-03-30 00:00 |
18:39:23.81 |
-00:16:25.4 |
HIP 91352 |
22.81 |
| 2026-03-30 12:00 |
18:39:23.83 |
-00:16:16.0 |
HIP 91352 |
22.86 |
| 2026-03-31 00:00 |
18:39:23.83 |
-00:16:06.6 |
HIP 91352 |
22.91 |
| 2026-03-31 12:00 |
18:39:23.81 |
-00:15:57.2 |
HIP 91352 |
22.96 |
| 2026-04-01 00:00 |
18:39:23.79 |
-00:15:47.9 |
HIP 91352 |
23.00 |
| 2026-04-01 12:00 |
18:39:23.75 |
-00:15:38.5 |
HIP 91352 |
23.04 |
| 2026-04-02 00:00 |
18:39:23.70 |
-00:15:29.2 |
HIP 91352 |
23.08 |
| 2026-04-02 12:00 |
18:39:23.63 |
-00:15:19.9 |
HIP 91352 |
23.12 |
| 2026-04-03 00:00 |
18:39:23.55 |
-00:15:10.6 |
HIP 91352 |
23.15 |
| 2026-04-03 12:00 |
18:39:23.46 |
-00:15:01.3 |
HIP 91352 |
23.18 |
| 2026-04-04 00:00 |
18:39:23.36 |
-00:14:52.1 |
HIP 91352 |
23.21 |
| 2026-04-04 12:00 |
18:39:23.24 |
-00:14:42.8 |
HIP 91352 |
23.24 |
| 2026-04-05 00:00 |
18:39:23.11 |
-00:14:33.6 |
HIP 91352 |
23.27 |
| 2026-04-05 12:00 |
18:39:22.96 |
-00:14:24.4 |
HIP 91352 |
23.29 |
| 2026-04-06 00:00 |
18:39:22.81 |
-00:14:15.2 |
HIP 91352 |
23.31 |
| 2026-04-06 12:00 |
18:39:22.64 |
-00:14:06.0 |
HIP 91352 |
23.33 |
| 2026-04-07 00:00 |
18:39:22.45 |
-00:13:56.8 |
HIP 91505 |
23.25 |
| 2026-04-07 12:00 |
18:39:22.26 |
-00:13:47.7 |
HIP 91505 |
23.11 |
| 2026-04-08 00:00 |
18:39:22.05 |
-00:13:38.6 |
HIP 91505 |
22.97 |
| 2026-04-08 12:00 |
18:39:21.83 |
-00:13:29.5 |
HIP 91505 |
22.83 |
| 2026-04-09 00:00 |
18:39:21.59 |
-00:13:20.4 |
HIP 91505 |
22.70 |
| 2026-04-09 12:00 |
18:39:21.34 |
-00:13:11.4 |
HIP 91505 |
22.56 |
| 2026-04-10 00:00 |
18:39:21.08 |
-00:13:02.4 |
HIP 91505 |
22.43 |
| 2026-04-10 12:00 |
18:39:20.80 |
-00:12:53.4 |
HIP 91505 |
22.30 |
| 2026-04-11 00:00 |
18:39:20.52 |
-00:12:44.4 |
HIP 91505 |
22.17 |
| 2026-04-11 12:00 |
18:39:20.22 |
-00:12:35.5 |
HIP 91505 |
22.04 |
| 2026-04-12 00:00 |
18:39:19.90 |
-00:12:26.5 |
HIP 91505 |
21.92 |
| 2026-04-12 12:00 |
18:39:19.58 |
-00:12:17.7 |
HIP 91505 |
21.79 |
| 2026-04-13 00:00 |
18:39:19.24 |
-00:12:08.8 |
HIP 91505 |
21.67 |
| 2026-04-13 12:00 |
18:39:18.88 |
-00:12:00.0 |
HIP 91505 |
21.55 |
| 2026-04-14 00:00 |
18:39:18.52 |
-00:11:51.2 |
HIP 91505 |
21.43 |
| 2026-04-14 12:00 |
18:39:18.14 |
-00:11:42.4 |
HIP 91505 |
21.31 |
| 2026-04-15 00:00 |
18:39:17.75 |
-00:11:33.6 |
HIP 91505 |
21.20 |
| 2026-04-15 12:00 |
18:39:17.34 |
-00:11:24.9 |
HIP 91505 |
21.08 |
| 2026-04-16 00:00 |
18:39:16.93 |
-00:11:16.2 |
HIP 91505 |
20.97 |