| Parameter |
Value |
| Designation |
C/1970 U1 (Suzuki-Sato-Seki) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1970-10-01T19:05:27.113280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:19Z |
| Obs used |
47 |
| NEO |
- |
| M1 |
9.500 |
| K1 |
18.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1970-10-31.0000000 |
| e |
1.00000000 |
| q (au) |
0.405493 |
| a (au) |
- |
| i (deg) |
60.785050 |
| Ω (om, deg) |
293.680878 |
| ω (w, deg) |
318.520987 |
| M (ma, deg) |
- |
Magnitude
Scatter + Global Linear
$$
M_a = (8.314 + 3.396\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.314 |
| n |
3.396 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| 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) |
| 2026-07-29 00:00 |
05:22:00.39 |
+64:30:11.2 |
HIP 24808 |
18.84 |
| 2026-07-29 12:00 |
05:22:02.74 |
+64:30:21.7 |
HIP 24808 |
19.07 |
| 2026-07-30 00:00 |
05:22:05.07 |
+64:30:32.3 |
HIP 24808 |
19.30 |
| 2026-07-30 12:00 |
05:22:07.39 |
+64:30:43.0 |
HIP 24808 |
19.53 |
| 2026-07-31 00:00 |
05:22:09.68 |
+64:30:53.7 |
HIP 24808 |
19.76 |
| 2026-07-31 12:00 |
05:22:11.95 |
+64:31:04.5 |
HIP 24808 |
19.99 |
| 2026-08-01 00:00 |
05:22:14.21 |
+64:31:15.4 |
HIP 24808 |
20.22 |
| 2026-08-01 12:00 |
05:22:16.44 |
+64:31:26.4 |
HIP 25305 |
20.39 |
| 2026-08-02 00:00 |
05:22:18.66 |
+64:31:37.4 |
HIP 25305 |
20.09 |
| 2026-08-02 12:00 |
05:22:20.85 |
+64:31:48.5 |
HIP 25305 |
19.79 |
| 2026-08-03 00:00 |
05:22:23.03 |
+64:31:59.7 |
HIP 25305 |
19.49 |
| 2026-08-03 12:00 |
05:22:25.18 |
+64:32:10.9 |
HIP 25305 |
19.19 |
| 2026-08-04 00:00 |
05:22:27.32 |
+64:32:22.2 |
HIP 25305 |
18.89 |
| 2026-08-04 12:00 |
05:22:29.43 |
+64:32:33.6 |
HIP 25305 |
18.60 |
| 2026-08-05 00:00 |
05:22:31.53 |
+64:32:45.1 |
HIP 25305 |
18.30 |
| 2026-08-05 12:00 |
05:22:33.60 |
+64:32:56.6 |
HIP 25305 |
18.01 |
| 2026-08-06 00:00 |
05:22:35.65 |
+64:33:08.2 |
HIP 25305 |
17.72 |
| 2026-08-06 12:00 |
05:22:37.68 |
+64:33:19.8 |
HIP 25305 |
17.43 |
| 2026-08-07 00:00 |
05:22:39.69 |
+64:33:31.5 |
HIP 25305 |
17.14 |
| 2026-08-07 12:00 |
05:22:41.67 |
+64:33:43.3 |
HIP 25305 |
16.85 |
| 2026-08-08 00:00 |
05:22:43.64 |
+64:33:55.2 |
HIP 25305 |
16.56 |
| 2026-08-08 12:00 |
05:22:45.58 |
+64:34:07.1 |
HIP 25305 |
16.27 |
| 2026-08-09 00:00 |
05:22:47.51 |
+64:34:19.1 |
HIP 25305 |
15.99 |
| 2026-08-09 12:00 |
05:22:49.40 |
+64:34:31.1 |
HIP 25305 |
15.70 |
| 2026-08-10 00:00 |
05:22:51.28 |
+64:34:43.2 |
HIP 25305 |
15.42 |
| 2026-08-10 12:00 |
05:22:53.14 |
+64:34:55.4 |
HIP 25305 |
15.14 |
| 2026-08-11 00:00 |
05:22:54.97 |
+64:35:07.6 |
HIP 25305 |
14.86 |
| 2026-08-11 12:00 |
05:22:56.78 |
+64:35:19.9 |
HIP 25305 |
14.59 |
| 2026-08-12 00:00 |
05:22:58.56 |
+64:35:32.2 |
HIP 25305 |
14.31 |
| 2026-08-12 12:00 |
05:23:00.32 |
+64:35:44.6 |
HIP 25305 |
14.04 |
| 2026-08-13 00:00 |
05:23:02.06 |
+64:35:57.1 |
HIP 25305 |
13.76 |
| 2026-08-13 12:00 |
05:23:03.78 |
+64:36:09.6 |
HIP 25305 |
13.49 |
| 2026-08-14 00:00 |
05:23:05.47 |
+64:36:22.1 |
HIP 25305 |
13.22 |
| 2026-08-14 12:00 |
05:23:07.14 |
+64:36:34.7 |
HIP 25305 |
12.96 |
| 2026-08-15 00:00 |
05:23:08.78 |
+64:36:47.4 |
HIP 25305 |
12.69 |
| 2026-08-15 12:00 |
05:23:10.40 |
+64:37:00.1 |
HIP 25305 |
12.43 |
| 2026-08-16 00:00 |
05:23:12.00 |
+64:37:12.9 |
HIP 25305 |
12.17 |
| 2026-08-16 12:00 |
05:23:13.57 |
+64:37:25.7 |
HIP 25305 |
11.91 |
| 2026-08-17 00:00 |
05:23:15.12 |
+64:37:38.6 |
HIP 25305 |
11.66 |
| 2026-08-17 12:00 |
05:23:16.64 |
+64:37:51.5 |
HIP 25305 |
11.40 |
| 2026-08-18 00:00 |
05:23:18.14 |
+64:38:04.5 |
HIP 25305 |
11.15 |
| 2026-08-18 12:00 |
05:23:19.62 |
+64:38:17.5 |
HIP 25305 |
10.91 |
| 2026-08-19 00:00 |
05:23:21.07 |
+64:38:30.6 |
HIP 25305 |
10.66 |