| 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 |
0.999 |
| gb |
-0.500 |
| 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) |
| 2026-09-20 00:00 |
04:22:27.22 |
+18:12:47.9 |
HIP 20336 |
15.36 |
| 2026-09-20 12:00 |
04:22:28.33 |
+18:11:45.0 |
HIP 20336 |
15.86 |
| 2026-09-21 00:00 |
04:22:29.21 |
+18:10:41.4 |
HIP 20336 |
16.38 |
| 2026-09-21 12:00 |
04:22:29.88 |
+18:09:37.1 |
HIP 20336 |
16.90 |
| 2026-09-22 00:00 |
04:22:30.33 |
+18:08:32.1 |
HIP 20336 |
17.44 |
| 2026-09-22 12:00 |
04:22:30.56 |
+18:07:26.4 |
HIP 20336 |
17.98 |
| 2026-09-23 00:00 |
04:22:30.57 |
+18:06:19.9 |
HIP 20336 |
18.53 |
| 2026-09-23 12:00 |
04:22:30.36 |
+18:05:12.8 |
HIP 20336 |
19.10 |
| 2026-09-24 00:00 |
04:22:29.93 |
+18:04:05.0 |
HIP 20336 |
19.68 |
| 2026-09-24 12:00 |
04:22:29.28 |
+18:02:56.5 |
HIP 20336 |
20.27 |
| 2026-09-25 00:00 |
04:22:28.40 |
+18:01:47.3 |
HIP 20336 |
20.88 |
| 2026-09-25 12:00 |
04:22:27.31 |
+18:00:37.3 |
HIP 20336 |
21.51 |
| 2026-09-26 00:00 |
04:22:25.99 |
+17:59:26.7 |
HIP 20336 |
22.15 |
| 2026-09-26 12:00 |
04:22:24.45 |
+17:58:15.4 |
HIP 20336 |
22.82 |
| 2026-09-27 00:00 |
04:22:22.68 |
+17:57:03.4 |
HIP 20336 |
23.51 |
| 2026-09-27 12:00 |
04:22:20.69 |
+17:55:50.7 |
HIP 20336 |
24.23 |
| 2026-09-28 00:00 |
04:22:18.48 |
+17:54:37.2 |
HIP 20455 |
23.81 |
| 2026-09-28 12:00 |
04:22:16.04 |
+17:53:23.1 |
HIP 20455 |
22.90 |
| 2026-09-29 00:00 |
04:22:13.38 |
+17:52:08.3 |
HIP 20455 |
22.06 |
| 2026-09-29 12:00 |
04:22:10.49 |
+17:50:52.8 |
HIP 20455 |
21.29 |
| 2026-09-30 00:00 |
04:22:07.38 |
+17:49:36.5 |
HIP 20455 |
20.62 |
| 2026-09-30 12:00 |
04:22:04.04 |
+17:48:19.6 |
HIP 20455 |
20.05 |
| 2026-10-01 00:00 |
04:22:00.47 |
+17:47:02.0 |
HIP 20455 |
19.62 |
| 2026-10-01 12:00 |
04:21:56.68 |
+17:45:43.7 |
HIP 20455 |
19.32 |
| 2026-10-02 00:00 |
04:21:52.66 |
+17:44:24.7 |
HIP 20455 |
19.20 |
| 2026-10-02 12:00 |
04:21:48.42 |
+17:43:05.0 |
HIP 20455 |
19.24 |
| 2026-10-03 00:00 |
04:21:43.94 |
+17:41:44.6 |
HIP 20455 |
19.48 |
| 2026-10-03 12:00 |
04:21:39.24 |
+17:40:23.6 |
HIP 20455 |
19.90 |
| 2026-10-04 00:00 |
04:21:34.32 |
+17:39:01.8 |
HIP 20455 |
20.52 |
| 2026-10-04 12:00 |
04:21:29.16 |
+17:37:39.3 |
HIP 20455 |
21.32 |
| 2026-10-05 00:00 |
04:21:23.78 |
+17:36:16.2 |
HIP 20455 |
22.30 |
| 2026-10-05 12:00 |
04:21:18.17 |
+17:34:52.4 |
HIP 20455 |
23.44 |
| 2026-10-06 00:00 |
04:21:12.33 |
+17:33:27.9 |
HIP 20455 |
24.74 |
| 2026-10-06 12:00 |
04:21:06.26 |
+17:32:02.7 |
HIP 20455 |
26.17 |
| 2026-10-07 00:00 |
04:20:59.97 |
+17:30:36.9 |
HIP 20146 |
26.72 |
| 2026-10-07 12:00 |
04:20:53.44 |
+17:29:10.3 |
HIP 20146 |
25.26 |
| 2026-10-08 00:00 |
04:20:46.70 |
+17:27:43.2 |
HIP 20146 |
23.85 |
| 2026-10-08 12:00 |
04:20:39.72 |
+17:26:15.3 |
HIP 20146 |
22.50 |
| 2026-10-09 00:00 |
04:20:32.52 |
+17:24:46.8 |
HIP 20146 |
21.26 |
| 2026-10-09 12:00 |
04:20:25.10 |
+17:23:17.6 |
HIP 20146 |
20.14 |
| 2026-10-10 00:00 |
04:20:17.45 |
+17:21:47.8 |
HIP 20146 |
19.20 |
| 2026-10-10 12:00 |
04:20:09.57 |
+17:20:17.3 |
HIP 20146 |
18.48 |
| 2026-10-11 00:00 |
04:20:01.47 |
+17:18:46.1 |
HIP 20146 |
18.02 |