| Parameter |
Value |
| Designation |
C/1983 J1 (Sugano-Saigusa-Fujikawa) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1983-05-01T07:52:43.495680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:29Z |
| Obs used |
55 |
| NEO |
- |
| M1 |
12.200 |
| K1 |
15.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1983-05-15.0000000 |
| e |
0.99990155 |
| q (au) |
0.471084 |
| a (au) |
4784.905650 |
| i (deg) |
96.622884 |
| Ω (om, deg) |
83.039467 |
| ω (w, deg) |
82.173450 |
| M (ma, deg) |
0.000041 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.814 + 5.498\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.814 |
| n |
5.498 |
| gf |
0.800 |
| gb |
-0.678 |
| k |
0.974 |
| 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 |
09:11:25.87 |
-79:43:23.0 |
HIP 45071 |
21.93 |
| 2026-03-26 12:00 |
09:11:19.63 |
-79:43:03.6 |
HIP 45071 |
21.59 |
| 2026-03-27 00:00 |
09:11:13.47 |
-79:42:44.0 |
HIP 45071 |
21.25 |
| 2026-03-27 12:00 |
09:11:07.37 |
-79:42:24.3 |
HIP 45071 |
20.90 |
| 2026-03-28 00:00 |
09:11:01.34 |
-79:42:04.4 |
HIP 45071 |
20.56 |
| 2026-03-28 12:00 |
09:10:55.38 |
-79:41:44.4 |
HIP 45071 |
20.22 |
| 2026-03-29 00:00 |
09:10:49.49 |
-79:41:24.3 |
HIP 45071 |
19.89 |
| 2026-03-29 12:00 |
09:10:43.67 |
-79:41:03.9 |
HIP 45071 |
19.55 |
| 2026-03-30 00:00 |
09:10:37.92 |
-79:40:43.5 |
HIP 45071 |
19.21 |
| 2026-03-30 12:00 |
09:10:32.24 |
-79:40:22.9 |
HIP 45071 |
18.88 |
| 2026-03-31 00:00 |
09:10:26.64 |
-79:40:02.1 |
HIP 45071 |
18.54 |
| 2026-03-31 12:00 |
09:10:21.10 |
-79:39:41.3 |
HIP 45071 |
18.21 |
| 2026-04-01 00:00 |
09:10:15.64 |
-79:39:20.2 |
HIP 45071 |
17.88 |
| 2026-04-01 12:00 |
09:10:10.24 |
-79:38:59.1 |
HIP 45071 |
17.55 |
| 2026-04-02 00:00 |
09:10:04.92 |
-79:38:37.8 |
HIP 45071 |
17.23 |
| 2026-04-02 12:00 |
09:09:59.67 |
-79:38:16.4 |
HIP 45071 |
16.90 |
| 2026-04-03 00:00 |
09:09:54.50 |
-79:37:54.8 |
HIP 45071 |
16.58 |
| 2026-04-03 12:00 |
09:09:49.39 |
-79:37:33.1 |
HIP 45071 |
16.26 |
| 2026-04-04 00:00 |
09:09:44.37 |
-79:37:11.3 |
HIP 45071 |
15.94 |
| 2026-04-04 12:00 |
09:09:39.41 |
-79:36:49.4 |
HIP 45071 |
15.63 |
| 2026-04-05 00:00 |
09:09:34.53 |
-79:36:27.3 |
HIP 45071 |
15.31 |
| 2026-04-05 12:00 |
09:09:29.72 |
-79:36:05.1 |
HIP 45071 |
15.00 |
| 2026-04-06 00:00 |
09:09:24.98 |
-79:35:42.8 |
HIP 45071 |
14.70 |
| 2026-04-06 12:00 |
09:09:20.32 |
-79:35:20.4 |
HIP 45071 |
14.40 |
| 2026-04-07 00:00 |
09:09:15.74 |
-79:34:57.8 |
HIP 45071 |
14.10 |
| 2026-04-07 12:00 |
09:09:11.23 |
-79:34:35.1 |
HIP 45071 |
13.80 |
| 2026-04-08 00:00 |
09:09:06.79 |
-79:34:12.4 |
HIP 45071 |
13.51 |
| 2026-04-08 12:00 |
09:09:02.43 |
-79:33:49.5 |
HIP 45071 |
13.23 |
| 2026-04-09 00:00 |
09:08:58.15 |
-79:33:26.5 |
HIP 45071 |
12.95 |
| 2026-04-09 12:00 |
09:08:53.94 |
-79:33:03.4 |
HIP 45071 |
12.67 |
| 2026-04-10 00:00 |
09:08:49.81 |
-79:32:40.2 |
HIP 45071 |
12.40 |
| 2026-04-10 12:00 |
09:08:45.75 |
-79:32:16.8 |
HIP 45071 |
12.14 |
| 2026-04-11 00:00 |
09:08:41.77 |
-79:31:53.4 |
HIP 45071 |
11.88 |
| 2026-04-11 12:00 |
09:08:37.86 |
-79:31:29.9 |
HIP 45071 |
11.64 |
| 2026-04-12 00:00 |
09:08:34.04 |
-79:31:06.3 |
HIP 45071 |
11.39 |
| 2026-04-12 12:00 |
09:08:30.29 |
-79:30:42.5 |
HIP 45071 |
11.16 |
| 2026-04-13 00:00 |
09:08:26.61 |
-79:30:18.7 |
HIP 45071 |
10.94 |
| 2026-04-13 12:00 |
09:08:23.02 |
-79:29:54.8 |
HIP 45071 |
10.72 |
| 2026-04-14 00:00 |
09:08:19.50 |
-79:29:30.8 |
HIP 45071 |
10.52 |
| 2026-04-14 12:00 |
09:08:16.06 |
-79:29:06.7 |
HIP 45071 |
10.32 |
| 2026-04-15 00:00 |
09:08:12.70 |
-79:28:42.5 |
HIP 45071 |
10.14 |
| 2026-04-15 12:00 |
09:08:09.41 |
-79:28:18.3 |
HIP 45071 |
9.97 |
| 2026-04-16 00:00 |
09:08:06.21 |
-79:27:53.9 |
HIP 45071 |
9.81 |