| Parameter |
Value |
| Designation |
83D/Russell 1 |
| Type |
D |
| Perihelion (tp_cal, UTC) |
1985-07-05T05:29:58.032960Z |
| Orbit solution date (soln_date, UTC) |
2002-03-14T16:28:09Z |
| Obs used |
20 |
| NEO |
- |
| M1 |
14.000 |
| K1 |
15.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1985-06-24.0000000 |
| e |
0.51720991 |
| q (au) |
1.611542 |
| a (au) |
3.337976 |
| i (deg) |
22.659459 |
| Ω (om, deg) |
230.842006 |
| ω (w, deg) |
0.376229 |
| M (ma, deg) |
358.185212 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.812 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.812 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| k |
1.000 |
| 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 |
02:21:32.94 |
+14:45:48.9 |
HIP 10827 |
32.92 |
| 2026-03-26 12:00 |
02:21:55.65 |
+14:47:07.7 |
HIP 10827 |
37.96 |
| 2026-03-27 00:00 |
02:22:18.43 |
+14:48:26.7 |
HIP 11134 |
39.19 |
| 2026-03-27 12:00 |
02:22:41.28 |
+14:49:46.0 |
HIP 11134 |
36.27 |
| 2026-03-28 00:00 |
02:23:04.19 |
+14:51:05.4 |
HIP 11134 |
34.05 |
| 2026-03-28 12:00 |
02:23:27.16 |
+14:52:25.0 |
HIP 11134 |
32.67 |
| 2026-03-29 00:00 |
02:23:50.19 |
+14:53:44.9 |
HIP 11298 |
31.67 |
| 2026-03-29 12:00 |
02:24:13.28 |
+14:55:04.9 |
HIP 11298 |
28.80 |
| 2026-03-30 00:00 |
02:24:36.44 |
+14:56:25.2 |
HIP 11298 |
26.85 |
| 2026-03-30 12:00 |
02:24:59.65 |
+14:57:45.6 |
HIP 11298 |
26.06 |
| 2026-03-31 00:00 |
02:25:22.93 |
+14:59:06.2 |
HIP 11298 |
26.52 |
| 2026-03-31 12:00 |
02:25:46.26 |
+15:00:26.9 |
HIP 11298 |
28.20 |
| 2026-04-01 00:00 |
02:26:09.65 |
+15:01:47.9 |
HIP 11298 |
30.90 |
| 2026-04-01 12:00 |
02:26:33.10 |
+15:03:08.9 |
HIP 11512 |
32.22 |
| 2026-04-02 00:00 |
02:26:56.60 |
+15:04:30.2 |
HIP 11512 |
28.44 |
| 2026-04-02 12:00 |
02:27:20.16 |
+15:05:51.6 |
HIP 11512 |
25.43 |
| 2026-04-03 00:00 |
02:27:43.78 |
+15:07:13.2 |
HIP 11512 |
23.53 |
| 2026-04-03 12:00 |
02:28:07.45 |
+15:08:34.9 |
HIP 11512 |
23.00 |
| 2026-04-04 00:00 |
02:28:31.18 |
+15:09:56.7 |
HIP 11619 |
23.39 |
| 2026-04-04 12:00 |
02:28:54.96 |
+15:11:18.7 |
HIP 11619 |
17.95 |
| 2026-04-05 00:00 |
02:29:18.79 |
+15:12:40.8 |
HIP 11619 |
12.90 |
| 2026-04-05 12:00 |
02:29:42.68 |
+15:14:03.0 |
HIP 11619 |
8.97 |
| 2026-04-06 00:00 |
02:30:06.62 |
+15:15:25.3 |
HIP 11619 |
8.04 |
| 2026-04-06 12:00 |
02:30:30.61 |
+15:16:47.7 |
HIP 11619 |
10.93 |
| 2026-04-07 00:00 |
02:30:54.65 |
+15:18:10.3 |
HIP 11619 |
15.66 |
| 2026-04-07 12:00 |
02:31:18.75 |
+15:19:33.0 |
HIP 11619 |
21.04 |
| 2026-04-08 00:00 |
02:31:42.89 |
+15:20:55.7 |
HIP 11827 |
17.47 |
| 2026-04-08 12:00 |
02:32:07.09 |
+15:22:18.6 |
HIP 11827 |
14.66 |
| 2026-04-09 00:00 |
02:32:31.33 |
+15:23:41.5 |
HIP 11827 |
14.03 |
| 2026-04-09 12:00 |
02:32:55.62 |
+15:25:04.5 |
HIP 11827 |
15.84 |
| 2026-04-10 00:00 |
02:33:19.96 |
+15:26:27.6 |
HIP 11827 |
19.43 |
| 2026-04-10 12:00 |
02:33:44.34 |
+15:27:50.8 |
HIP 12015 |
17.98 |
| 2026-04-11 00:00 |
02:34:08.77 |
+15:29:14.0 |
HIP 12015 |
12.95 |
| 2026-04-11 12:00 |
02:34:33.25 |
+15:30:37.3 |
HIP 12015 |
9.24 |
| 2026-04-12 00:00 |
02:34:57.78 |
+15:32:00.6 |
HIP 12015 |
8.73 |
| 2026-04-12 12:00 |
02:35:22.35 |
+15:33:24.0 |
HIP 12015 |
11.88 |
| 2026-04-13 00:00 |
02:35:46.96 |
+15:34:47.5 |
HIP 12015 |
16.74 |
| 2026-04-13 12:00 |
02:36:11.61 |
+15:36:11.0 |
HIP 12015 |
22.22 |
| 2026-04-14 00:00 |
02:36:36.31 |
+15:37:34.5 |
HIP 12015 |
27.97 |
| 2026-04-14 12:00 |
02:37:01.06 |
+15:38:58.0 |
HIP 12125 |
32.29 |
| 2026-04-15 00:00 |
02:37:25.84 |
+15:40:21.6 |
HIP 12125 |
36.12 |
| 2026-04-15 12:00 |
02:37:50.66 |
+15:41:45.2 |
HIP 12125 |
40.54 |
| 2026-04-16 00:00 |
02:38:15.53 |
+15:43:08.8 |
HIP 12125 |
45.36 |