| Parameter |
Value |
| Designation |
C/1975 T1 (Mori-Sato-Fujikawa) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1975-12-25T21:03:54.645120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:24Z |
| Obs used |
193 |
| NEO |
- |
| M1 |
6.300 |
| K1 |
6.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1975-12-18.0000000 |
| e |
0.99745745 |
| q (au) |
1.603934 |
| a (au) |
630.836848 |
| i (deg) |
91.607721 |
| Ω (om, deg) |
278.678467 |
| ω (w, deg) |
246.241227 |
| M (ma, deg) |
359.999510 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.062 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.062 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.978 |
| 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 |
18:23:13.63 |
+26:27:30.0 |
HIP 90058 |
15.74 |
| 2026-03-26 12:00 |
18:23:13.66 |
+26:27:48.9 |
HIP 90058 |
16.02 |
| 2026-03-27 00:00 |
18:23:13.67 |
+26:28:07.8 |
HIP 90058 |
16.31 |
| 2026-03-27 12:00 |
18:23:13.66 |
+26:28:26.7 |
HIP 90058 |
16.59 |
| 2026-03-28 00:00 |
18:23:13.64 |
+26:28:45.6 |
HIP 90058 |
16.87 |
| 2026-03-28 12:00 |
18:23:13.60 |
+26:29:04.5 |
HIP 90058 |
17.16 |
| 2026-03-29 00:00 |
18:23:13.55 |
+26:29:23.4 |
HIP 90058 |
17.44 |
| 2026-03-29 12:00 |
18:23:13.48 |
+26:29:42.2 |
HIP 90058 |
17.72 |
| 2026-03-30 00:00 |
18:23:13.39 |
+26:30:01.1 |
HIP 90058 |
18.00 |
| 2026-03-30 12:00 |
18:23:13.29 |
+26:30:19.9 |
HIP 90058 |
18.28 |
| 2026-03-31 00:00 |
18:23:13.18 |
+26:30:38.7 |
HIP 90058 |
18.56 |
| 2026-03-31 12:00 |
18:23:13.05 |
+26:30:57.5 |
HIP 90058 |
18.84 |
| 2026-04-01 00:00 |
18:23:12.91 |
+26:31:16.3 |
HIP 90058 |
19.12 |
| 2026-04-01 12:00 |
18:23:12.75 |
+26:31:35.1 |
HIP 90058 |
19.40 |
| 2026-04-02 00:00 |
18:23:12.57 |
+26:31:53.8 |
HIP 90058 |
19.68 |
| 2026-04-02 12:00 |
18:23:12.38 |
+26:32:12.5 |
HIP 90058 |
19.96 |
| 2026-04-03 00:00 |
18:23:12.17 |
+26:32:31.2 |
HIP 90058 |
20.24 |
| 2026-04-03 12:00 |
18:23:11.95 |
+26:32:49.9 |
HIP 90058 |
20.51 |
| 2026-04-04 00:00 |
18:23:11.72 |
+26:33:08.6 |
HIP 90058 |
20.79 |
| 2026-04-04 12:00 |
18:23:11.47 |
+26:33:27.2 |
HIP 90058 |
21.07 |
| 2026-04-05 00:00 |
18:23:11.20 |
+26:33:45.8 |
HIP 90058 |
21.34 |
| 2026-04-05 12:00 |
18:23:10.92 |
+26:34:04.4 |
HIP 90058 |
21.62 |
| 2026-04-06 00:00 |
18:23:10.62 |
+26:34:22.9 |
HIP 90058 |
21.89 |
| 2026-04-06 12:00 |
18:23:10.31 |
+26:34:41.4 |
HIP 90058 |
22.17 |
| 2026-04-07 00:00 |
18:23:09.98 |
+26:34:59.9 |
HIP 90058 |
22.44 |
| 2026-04-07 12:00 |
18:23:09.64 |
+26:35:18.3 |
HIP 90058 |
22.72 |
| 2026-04-08 00:00 |
18:23:09.28 |
+26:35:36.7 |
HIP 90058 |
22.99 |
| 2026-04-08 12:00 |
18:23:08.91 |
+26:35:55.1 |
HIP 90058 |
23.27 |
| 2026-04-09 00:00 |
18:23:08.52 |
+26:36:13.5 |
HIP 90058 |
23.54 |
| 2026-04-09 12:00 |
18:23:08.12 |
+26:36:31.7 |
HIP 90058 |
23.81 |
| 2026-04-10 00:00 |
18:23:07.71 |
+26:36:50.0 |
HIP 90058 |
24.08 |
| 2026-04-10 12:00 |
18:23:07.27 |
+26:37:08.2 |
HIP 90058 |
24.36 |
| 2026-04-11 00:00 |
18:23:06.83 |
+26:37:26.4 |
HIP 90058 |
24.63 |
| 2026-04-11 12:00 |
18:23:06.37 |
+26:37:44.5 |
HIP 90058 |
24.90 |
| 2026-04-12 00:00 |
18:23:05.89 |
+26:38:02.6 |
HIP 89993 |
24.82 |
| 2026-04-12 12:00 |
18:23:05.40 |
+26:38:20.6 |
HIP 89993 |
24.53 |
| 2026-04-13 00:00 |
18:23:04.89 |
+26:38:38.6 |
HIP 89993 |
24.25 |
| 2026-04-13 12:00 |
18:23:04.37 |
+26:38:56.5 |
HIP 89993 |
23.96 |
| 2026-04-14 00:00 |
18:23:03.84 |
+26:39:14.4 |
HIP 89993 |
23.68 |
| 2026-04-14 12:00 |
18:23:03.29 |
+26:39:32.3 |
HIP 89993 |
23.39 |
| 2026-04-15 00:00 |
18:23:02.72 |
+26:39:50.0 |
HIP 89993 |
23.10 |
| 2026-04-15 12:00 |
18:23:02.14 |
+26:40:07.8 |
HIP 89993 |
22.81 |
| 2026-04-16 00:00 |
18:23:01.55 |
+26:40:25.4 |
HIP 89993 |
22.52 |