C/1983 H1 (IRAS-Araki-Alcock)
| Parameter |
Value |
| Designation |
C/1983 H1 (IRAS-Araki-Alcock) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1983-05-21T06:06:31.124160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:29Z |
| Obs used |
347 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1983-05-13.0000000 |
| e |
0.98988782 |
| q (au) |
0.991341 |
| a (au) |
98.034357 |
| i (deg) |
73.251379 |
| Ω (om, deg) |
49.102458 |
| ω (w, deg) |
192.850689 |
| M (ma, deg) |
359.991618 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.784 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.784 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.513 |
| k |
0.800 |
| 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) |
| 2026-02-03 00:00 |
03:03:11.99 |
+18:15:47.7 |
HIP 14132 |
13.98 |
| 2026-02-03 12:00 |
03:03:11.83 |
+18:15:47.2 |
HIP 14132 |
13.95 |
| 2026-02-04 00:00 |
03:03:11.70 |
+18:15:46.7 |
HIP 14132 |
13.92 |
| 2026-02-04 12:00 |
03:03:11.58 |
+18:15:46.4 |
HIP 14132 |
13.89 |
| 2026-02-05 00:00 |
03:03:11.47 |
+18:15:46.1 |
HIP 14132 |
13.87 |
| 2026-02-05 12:00 |
03:03:11.39 |
+18:15:45.9 |
HIP 14132 |
13.85 |
| 2026-02-06 00:00 |
03:03:11.32 |
+18:15:45.7 |
HIP 14132 |
13.84 |
| 2026-02-06 12:00 |
03:03:11.26 |
+18:15:45.6 |
HIP 14132 |
13.83 |
| 2026-02-07 00:00 |
03:03:11.23 |
+18:15:45.6 |
HIP 14132 |
13.82 |
| 2026-02-07 12:00 |
03:03:11.21 |
+18:15:45.7 |
HIP 14132 |
13.81 |
| 2026-02-08 00:00 |
03:03:11.21 |
+18:15:45.8 |
HIP 14132 |
13.81 |
| 2026-02-08 12:00 |
03:03:11.22 |
+18:15:46.0 |
HIP 14132 |
13.81 |
| 2026-02-09 00:00 |
03:03:11.25 |
+18:15:46.3 |
HIP 14132 |
13.82 |
| 2026-02-09 12:00 |
03:03:11.30 |
+18:15:46.6 |
HIP 14132 |
13.83 |
| 2026-02-10 00:00 |
03:03:11.37 |
+18:15:47.0 |
HIP 14132 |
13.84 |
| 2026-02-10 12:00 |
03:03:11.45 |
+18:15:47.5 |
HIP 14132 |
13.86 |
| 2026-02-11 00:00 |
03:03:11.55 |
+18:15:48.0 |
HIP 14132 |
13.88 |
| 2026-02-11 12:00 |
03:03:11.67 |
+18:15:48.6 |
HIP 14132 |
13.90 |
| 2026-02-12 00:00 |
03:03:11.80 |
+18:15:49.3 |
HIP 14132 |
13.93 |
| 2026-02-12 12:00 |
03:03:11.95 |
+18:15:50.1 |
HIP 14132 |
13.96 |
| 2026-02-13 00:00 |
03:03:12.12 |
+18:15:50.9 |
HIP 14132 |
13.99 |
| 2026-02-13 12:00 |
03:03:12.30 |
+18:15:51.8 |
HIP 14132 |
14.03 |
| 2026-02-14 00:00 |
03:03:12.50 |
+18:15:52.7 |
HIP 14132 |
14.07 |
| 2026-02-14 12:00 |
03:03:12.72 |
+18:15:53.8 |
HIP 14132 |
14.12 |
| 2026-02-15 00:00 |
03:03:12.95 |
+18:15:54.9 |
HIP 14132 |
14.17 |
| 2026-02-15 12:00 |
03:03:13.20 |
+18:15:56.0 |
HIP 14132 |
14.22 |
| 2026-02-16 00:00 |
03:03:13.47 |
+18:15:57.3 |
HIP 14132 |
14.27 |
| 2026-02-16 12:00 |
03:03:13.75 |
+18:15:58.6 |
HIP 14132 |
14.33 |
| 2026-02-17 00:00 |
03:03:14.05 |
+18:16:00.0 |
HIP 14132 |
14.40 |
| 2026-02-17 12:00 |
03:03:14.37 |
+18:16:01.4 |
HIP 14132 |
14.46 |
| 2026-02-18 00:00 |
03:03:14.70 |
+18:16:02.9 |
HIP 14132 |
14.53 |
| 2026-02-18 12:00 |
03:03:15.05 |
+18:16:04.5 |
HIP 14132 |
14.61 |
| 2026-02-19 00:00 |
03:03:15.42 |
+18:16:06.1 |
HIP 14132 |
14.68 |
| 2026-02-19 12:00 |
03:03:15.80 |
+18:16:07.9 |
HIP 14132 |
14.76 |
| 2026-02-20 00:00 |
03:03:16.20 |
+18:16:09.7 |
HIP 14132 |
14.85 |
| 2026-02-20 12:00 |
03:03:16.62 |
+18:16:11.5 |
HIP 14132 |
14.94 |
| 2026-02-21 00:00 |
03:03:17.05 |
+18:16:13.4 |
HIP 14132 |
15.03 |
| 2026-02-21 12:00 |
03:03:17.50 |
+18:16:15.4 |
HIP 14132 |
15.13 |
| 2026-02-22 00:00 |
03:03:17.96 |
+18:16:17.5 |
HIP 14132 |
15.22 |
| 2026-02-22 12:00 |
03:03:18.44 |
+18:16:19.6 |
HIP 14132 |
15.33 |
| 2026-02-23 00:00 |
03:03:18.94 |
+18:16:21.8 |
HIP 14132 |
15.43 |
| 2026-02-23 12:00 |
03:03:19.45 |
+18:16:24.0 |
HIP 14132 |
15.54 |
| 2026-02-24 00:00 |
03:03:19.98 |
+18:16:26.4 |
HIP 14132 |
15.66 |