| 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) |
| 2026-06-01 00:00 |
18:21:13.99 |
+27:00:57.5 |
HIP 89993 |
9.07 |
| 2026-06-01 12:00 |
18:21:12.37 |
+27:01:05.3 |
HIP 89993 |
9.42 |
| 2026-06-02 00:00 |
18:21:10.75 |
+27:01:12.9 |
HIP 89993 |
9.78 |
| 2026-06-02 12:00 |
18:21:09.12 |
+27:01:20.3 |
HIP 89993 |
10.14 |
| 2026-06-03 00:00 |
18:21:07.49 |
+27:01:27.7 |
HIP 89993 |
10.50 |
| 2026-06-03 12:00 |
18:21:05.85 |
+27:01:34.8 |
HIP 89993 |
10.85 |
| 2026-06-04 00:00 |
18:21:04.21 |
+27:01:41.9 |
HIP 89993 |
11.22 |
| 2026-06-04 12:00 |
18:21:02.56 |
+27:01:48.7 |
HIP 89993 |
11.58 |
| 2026-06-05 00:00 |
18:21:00.90 |
+27:01:55.5 |
HIP 89993 |
11.94 |
| 2026-06-05 12:00 |
18:20:59.24 |
+27:02:02.1 |
HIP 89993 |
12.30 |
| 2026-06-06 00:00 |
18:20:57.57 |
+27:02:08.5 |
HIP 89993 |
12.67 |
| 2026-06-06 12:00 |
18:20:55.90 |
+27:02:14.8 |
HIP 89993 |
13.04 |
| 2026-06-07 00:00 |
18:20:54.22 |
+27:02:21.0 |
HIP 89993 |
13.40 |
| 2026-06-07 12:00 |
18:20:52.54 |
+27:02:27.0 |
HIP 89993 |
13.77 |
| 2026-06-08 00:00 |
18:20:50.85 |
+27:02:32.8 |
HIP 89993 |
14.14 |
| 2026-06-08 12:00 |
18:20:49.16 |
+27:02:38.5 |
HIP 89993 |
14.50 |
| 2026-06-09 00:00 |
18:20:47.46 |
+27:02:44.1 |
HIP 89993 |
14.87 |
| 2026-06-09 12:00 |
18:20:45.76 |
+27:02:49.5 |
HIP 89993 |
15.24 |
| 2026-06-10 00:00 |
18:20:44.05 |
+27:02:54.7 |
HIP 89993 |
15.61 |
| 2026-06-10 12:00 |
18:20:42.34 |
+27:02:59.8 |
HIP 89993 |
15.98 |
| 2026-06-11 00:00 |
18:20:40.63 |
+27:03:04.8 |
HIP 89993 |
16.35 |
| 2026-06-11 12:00 |
18:20:38.91 |
+27:03:09.5 |
HIP 89993 |
16.73 |
| 2026-06-12 00:00 |
18:20:37.19 |
+27:03:14.2 |
HIP 89993 |
17.10 |
| 2026-06-12 12:00 |
18:20:35.46 |
+27:03:18.7 |
HIP 89993 |
17.47 |
| 2026-06-13 00:00 |
18:20:33.73 |
+27:03:23.0 |
HIP 89993 |
17.84 |
| 2026-06-13 12:00 |
18:20:32.00 |
+27:03:27.2 |
HIP 89993 |
18.22 |
| 2026-06-14 00:00 |
18:20:30.26 |
+27:03:31.2 |
HIP 89993 |
18.59 |
| 2026-06-14 12:00 |
18:20:28.52 |
+27:03:35.1 |
HIP 89993 |
18.96 |
| 2026-06-15 00:00 |
18:20:26.78 |
+27:03:38.8 |
HIP 89993 |
19.33 |
| 2026-06-15 12:00 |
18:20:25.03 |
+27:03:42.4 |
HIP 89993 |
19.71 |
| 2026-06-16 00:00 |
18:20:23.29 |
+27:03:45.8 |
HIP 89993 |
20.08 |
| 2026-06-16 12:00 |
18:20:21.54 |
+27:03:49.0 |
HIP 89993 |
20.46 |
| 2026-06-17 00:00 |
18:20:19.78 |
+27:03:52.1 |
HIP 89993 |
20.83 |
| 2026-06-17 12:00 |
18:20:18.03 |
+27:03:55.0 |
HIP 89993 |
21.20 |
| 2026-06-18 00:00 |
18:20:16.27 |
+27:03:57.8 |
HIP 89993 |
21.58 |
| 2026-06-18 12:00 |
18:20:14.51 |
+27:04:00.5 |
HIP 89993 |
21.95 |
| 2026-06-19 00:00 |
18:20:12.74 |
+27:04:02.9 |
HIP 89993 |
22.33 |
| 2026-06-19 12:00 |
18:20:10.98 |
+27:04:05.2 |
HIP 89993 |
22.70 |
| 2026-06-20 00:00 |
18:20:09.21 |
+27:04:07.4 |
HIP 89704 |
22.92 |
| 2026-06-20 12:00 |
18:20:07.45 |
+27:04:09.4 |
HIP 89704 |
22.52 |
| 2026-06-21 00:00 |
18:20:05.68 |
+27:04:11.2 |
HIP 89704 |
22.13 |
| 2026-06-21 12:00 |
18:20:03.91 |
+27:04:12.9 |
HIP 89704 |
21.74 |
| 2026-06-22 00:00 |
18:20:02.14 |
+27:04:14.5 |
HIP 89704 |
21.35 |