| 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) |
| 2026-05-12 00:00 |
05:14:04.93 |
+64:23:14.3 |
HIP 24270 |
11.68 |
| 2026-05-12 12:00 |
05:14:07.84 |
+64:23:08.4 |
HIP 24270 |
11.91 |
| 2026-05-13 00:00 |
05:14:10.76 |
+64:23:02.6 |
HIP 24270 |
12.13 |
| 2026-05-13 12:00 |
05:14:13.70 |
+64:22:56.9 |
HIP 24270 |
12.37 |
| 2026-05-14 00:00 |
05:14:16.65 |
+64:22:51.4 |
HIP 24270 |
12.61 |
| 2026-05-14 12:00 |
05:14:19.60 |
+64:22:45.9 |
HIP 24270 |
12.86 |
| 2026-05-15 00:00 |
05:14:22.58 |
+64:22:40.5 |
HIP 24270 |
13.12 |
| 2026-05-15 12:00 |
05:14:25.56 |
+64:22:35.3 |
HIP 24270 |
13.38 |
| 2026-05-16 00:00 |
05:14:28.55 |
+64:22:30.2 |
HIP 24270 |
13.64 |
| 2026-05-16 12:00 |
05:14:31.56 |
+64:22:25.2 |
HIP 24270 |
13.91 |
| 2026-05-17 00:00 |
05:14:34.57 |
+64:22:20.3 |
HIP 24270 |
14.18 |
| 2026-05-17 12:00 |
05:14:37.60 |
+64:22:15.5 |
HIP 24270 |
14.46 |
| 2026-05-18 00:00 |
05:14:40.64 |
+64:22:10.8 |
HIP 24270 |
14.75 |
| 2026-05-18 12:00 |
05:14:43.68 |
+64:22:06.2 |
HIP 24270 |
15.03 |
| 2026-05-19 00:00 |
05:14:46.74 |
+64:22:01.7 |
HIP 24270 |
15.32 |
| 2026-05-19 12:00 |
05:14:49.81 |
+64:21:57.4 |
HIP 24270 |
15.62 |
| 2026-05-20 00:00 |
05:14:52.88 |
+64:21:53.2 |
HIP 24270 |
15.91 |
| 2026-05-20 12:00 |
05:14:55.97 |
+64:21:49.0 |
HIP 24270 |
16.21 |
| 2026-05-21 00:00 |
05:14:59.06 |
+64:21:45.0 |
HIP 24270 |
16.52 |
| 2026-05-21 12:00 |
05:15:02.17 |
+64:21:41.1 |
HIP 24270 |
16.83 |
| 2026-05-22 00:00 |
05:15:05.28 |
+64:21:37.4 |
HIP 24270 |
17.13 |
| 2026-05-22 12:00 |
05:15:08.40 |
+64:21:33.7 |
HIP 24270 |
17.45 |
| 2026-05-23 00:00 |
05:15:11.53 |
+64:21:30.1 |
HIP 24270 |
17.76 |
| 2026-05-23 12:00 |
05:15:14.67 |
+64:21:26.7 |
HIP 24270 |
18.08 |
| 2026-05-24 00:00 |
05:15:17.81 |
+64:21:23.4 |
HIP 24270 |
18.40 |
| 2026-05-24 12:00 |
05:15:20.97 |
+64:21:20.1 |
HIP 24270 |
18.72 |
| 2026-05-25 00:00 |
05:15:24.13 |
+64:21:17.0 |
HIP 24270 |
19.04 |
| 2026-05-25 12:00 |
05:15:27.29 |
+64:21:14.1 |
HIP 24270 |
19.37 |
| 2026-05-26 00:00 |
05:15:30.47 |
+64:21:11.2 |
HIP 24270 |
19.69 |
| 2026-05-26 12:00 |
05:15:33.65 |
+64:21:08.4 |
HIP 24270 |
20.02 |
| 2026-05-27 00:00 |
05:15:36.84 |
+64:21:05.8 |
HIP 24270 |
20.35 |
| 2026-05-27 12:00 |
05:15:40.03 |
+64:21:03.2 |
HIP 24270 |
20.69 |
| 2026-05-28 00:00 |
05:15:43.23 |
+64:21:00.8 |
HIP 24270 |
21.02 |
| 2026-05-28 12:00 |
05:15:46.44 |
+64:20:58.5 |
HIP 24270 |
21.36 |
| 2026-05-29 00:00 |
05:15:49.65 |
+64:20:56.3 |
HIP 24270 |
21.69 |
| 2026-05-29 12:00 |
05:15:52.87 |
+64:20:54.3 |
HIP 24270 |
22.03 |
| 2026-05-30 00:00 |
05:15:56.09 |
+64:20:52.3 |
HIP 24792 |
22.24 |
| 2026-05-30 12:00 |
05:15:59.32 |
+64:20:50.4 |
HIP 24792 |
21.91 |
| 2026-05-31 00:00 |
05:16:02.55 |
+64:20:48.7 |
HIP 24792 |
21.60 |
| 2026-05-31 12:00 |
05:16:05.79 |
+64:20:47.1 |
HIP 24792 |
21.28 |
| 2026-06-01 00:00 |
05:16:09.03 |
+64:20:45.6 |
HIP 24792 |
20.96 |
| 2026-06-01 12:00 |
05:16:12.28 |
+64:20:44.2 |
HIP 24792 |
20.65 |
| 2026-06-02 00:00 |
05:16:15.53 |
+64:20:42.9 |
HIP 24792 |
20.34 |