| Parameter |
Value |
| Designation |
C/1983 N1 (IRAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1983-05-02T16:52:11.812800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:31Z |
| Obs used |
19 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1983-12-26.0000000 |
| e |
0.99936962 |
| q (au) |
2.418058 |
| a (au) |
3835.864208 |
| i (deg) |
138.832959 |
| Ω (om, deg) |
171.801181 |
| ω (w, deg) |
265.589825 |
| M (ma, deg) |
0.000984 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.018 + 2.142\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.018 |
| n |
2.142 |
| gf |
1.000 |
| gb |
-0.842 |
| k |
0.800 |
| δ90 |
10.000 |
| 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 |
08:27:44.39 |
+56:42:14.3 |
HIP 41480 |
1.59 |
| 2026-03-26 12:00 |
08:27:42.72 |
+56:42:03.2 |
HIP 41480 |
1.57 |
| 2026-03-27 00:00 |
08:27:41.07 |
+56:41:52.0 |
HIP 41480 |
1.61 |
| 2026-03-27 12:00 |
08:27:39.44 |
+56:41:40.7 |
HIP 41480 |
1.71 |
| 2026-03-28 00:00 |
08:27:37.84 |
+56:41:29.3 |
HIP 41480 |
1.84 |
| 2026-03-28 12:00 |
08:27:36.27 |
+56:41:17.8 |
HIP 41480 |
2.01 |
| 2026-03-29 00:00 |
08:27:34.72 |
+56:41:06.2 |
HIP 41480 |
2.21 |
| 2026-03-29 12:00 |
08:27:33.19 |
+56:40:54.5 |
HIP 41480 |
2.43 |
| 2026-03-30 00:00 |
08:27:31.69 |
+56:40:42.7 |
HIP 41480 |
2.66 |
| 2026-03-30 12:00 |
08:27:30.21 |
+56:40:30.8 |
HIP 41480 |
2.90 |
| 2026-03-31 00:00 |
08:27:28.76 |
+56:40:18.9 |
HIP 41480 |
3.15 |
| 2026-03-31 12:00 |
08:27:27.34 |
+56:40:06.8 |
HIP 41480 |
3.40 |
| 2026-04-01 00:00 |
08:27:25.94 |
+56:39:54.6 |
HIP 41480 |
3.66 |
| 2026-04-01 12:00 |
08:27:24.56 |
+56:39:42.3 |
HIP 41480 |
3.92 |
| 2026-04-02 00:00 |
08:27:23.21 |
+56:39:30.0 |
HIP 41480 |
4.18 |
| 2026-04-02 12:00 |
08:27:21.89 |
+56:39:17.5 |
HIP 41480 |
4.45 |
| 2026-04-03 00:00 |
08:27:20.59 |
+56:39:05.0 |
HIP 41480 |
4.72 |
| 2026-04-03 12:00 |
08:27:19.32 |
+56:38:52.3 |
HIP 41480 |
4.98 |
| 2026-04-04 00:00 |
08:27:18.07 |
+56:38:39.6 |
HIP 41480 |
5.25 |
| 2026-04-04 12:00 |
08:27:16.85 |
+56:38:26.8 |
HIP 41480 |
5.52 |
| 2026-04-05 00:00 |
08:27:15.66 |
+56:38:13.9 |
HIP 41480 |
5.78 |
| 2026-04-05 12:00 |
08:27:14.49 |
+56:38:00.9 |
HIP 41480 |
6.05 |
| 2026-04-06 00:00 |
08:27:13.34 |
+56:37:47.8 |
HIP 41480 |
6.32 |
| 2026-04-06 12:00 |
08:27:12.23 |
+56:37:34.7 |
HIP 41480 |
6.58 |
| 2026-04-07 00:00 |
08:27:11.14 |
+56:37:21.5 |
HIP 41480 |
6.85 |
| 2026-04-07 12:00 |
08:27:10.07 |
+56:37:08.1 |
HIP 41480 |
7.12 |
| 2026-04-08 00:00 |
08:27:09.03 |
+56:36:54.7 |
HIP 41480 |
7.38 |
| 2026-04-08 12:00 |
08:27:08.02 |
+56:36:41.3 |
HIP 41480 |
7.64 |
| 2026-04-09 00:00 |
08:27:07.03 |
+56:36:27.7 |
HIP 41480 |
7.91 |
| 2026-04-09 12:00 |
08:27:06.07 |
+56:36:14.1 |
HIP 41480 |
8.17 |
| 2026-04-10 00:00 |
08:27:05.14 |
+56:36:00.4 |
HIP 41480 |
8.43 |
| 2026-04-10 12:00 |
08:27:04.23 |
+56:35:46.6 |
HIP 41480 |
8.69 |
| 2026-04-11 00:00 |
08:27:03.35 |
+56:35:32.8 |
HIP 41480 |
8.95 |
| 2026-04-11 12:00 |
08:27:02.50 |
+56:35:18.8 |
HIP 41480 |
9.21 |
| 2026-04-12 00:00 |
08:27:01.67 |
+56:35:04.8 |
HIP 41480 |
9.47 |
| 2026-04-12 12:00 |
08:27:00.87 |
+56:34:50.8 |
HIP 41480 |
9.73 |
| 2026-04-13 00:00 |
08:27:00.09 |
+56:34:36.6 |
HIP 41480 |
9.99 |
| 2026-04-13 12:00 |
08:26:59.34 |
+56:34:22.4 |
HIP 41480 |
10.25 |
| 2026-04-14 00:00 |
08:26:58.62 |
+56:34:08.2 |
HIP 41480 |
10.50 |
| 2026-04-14 12:00 |
08:26:57.93 |
+56:33:53.8 |
HIP 41480 |
10.76 |
| 2026-04-15 00:00 |
08:26:57.26 |
+56:33:39.4 |
HIP 41480 |
11.01 |
| 2026-04-15 12:00 |
08:26:56.62 |
+56:33:25.0 |
HIP 41480 |
11.27 |
| 2026-04-16 00:00 |
08:26:56.01 |
+56:33:10.5 |
HIP 41480 |
11.52 |