| Parameter |
Value |
| Designation |
89P/Russell 2 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-12-14T20:36:28.673280Z |
| Orbit solution date (soln_date, UTC) |
2025-11-13T13:54:38Z |
| Obs used |
648 |
| NEO |
- |
| M1 |
8.200 |
| K1 |
21.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-07-19.0000000 |
| e |
0.40842673 |
| q (au) |
2.220297 |
| a (au) |
3.753208 |
| i (deg) |
12.076267 |
| Ω (om, deg) |
41.443124 |
| ω (w, deg) |
250.178436 |
| M (ma, deg) |
78.773821 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.324 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.324 |
| n |
6.000 |
| gf |
0.856 |
| gb |
-0.758 |
| k |
0.985 |
| 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) |
| 2026-06-01 00:00 |
04:48:44.29 |
+28:02:51.2 |
HIP 22400 |
19.47 |
| 2026-06-01 12:00 |
04:49:15.97 |
+28:04:02.2 |
HIP 22400 |
17.01 |
| 2026-06-02 00:00 |
04:49:47.66 |
+28:05:12.9 |
HIP 22400 |
17.33 |
| 2026-06-02 12:00 |
04:50:19.34 |
+28:06:23.5 |
HIP 22527 |
14.38 |
| 2026-06-03 00:00 |
04:50:51.03 |
+28:07:33.7 |
HIP 22527 |
11.29 |
| 2026-06-03 12:00 |
04:51:22.72 |
+28:08:43.8 |
HIP 22527 |
12.17 |
| 2026-06-04 00:00 |
04:51:54.41 |
+28:09:53.6 |
HIP 22711 |
15.04 |
| 2026-06-04 12:00 |
04:52:26.10 |
+28:11:03.2 |
HIP 22711 |
8.94 |
| 2026-06-05 00:00 |
04:52:57.79 |
+28:12:12.6 |
HIP 22711 |
5.83 |
| 2026-06-05 12:00 |
04:53:29.47 |
+28:13:21.7 |
HIP 22711 |
9.39 |
| 2026-06-06 00:00 |
04:54:01.16 |
+28:14:30.6 |
HIP 22711 |
15.57 |
| 2026-06-06 12:00 |
04:54:32.84 |
+28:15:39.2 |
HIP 22711 |
22.29 |
| 2026-06-07 00:00 |
04:55:04.52 |
+28:16:47.7 |
HIP 23022 |
26.16 |
| 2026-06-07 12:00 |
04:55:36.20 |
+28:17:55.9 |
HIP 23022 |
19.29 |
| 2026-06-08 00:00 |
04:56:07.87 |
+28:19:03.8 |
HIP 23022 |
12.66 |
| 2026-06-08 12:00 |
04:56:39.53 |
+28:20:11.6 |
HIP 23022 |
6.93 |
| 2026-06-09 00:00 |
04:57:11.20 |
+28:21:19.1 |
HIP 23022 |
5.96 |
| 2026-06-09 12:00 |
04:57:42.85 |
+28:22:26.3 |
HIP 23022 |
11.07 |
| 2026-06-10 00:00 |
04:58:14.50 |
+28:23:33.4 |
HIP 23022 |
17.58 |
| 2026-06-10 12:00 |
04:58:46.14 |
+28:24:40.2 |
HIP 23141 |
22.76 |
| 2026-06-11 00:00 |
04:59:17.77 |
+28:25:46.7 |
HIP 23141 |
22.77 |
| 2026-06-11 12:00 |
04:59:49.39 |
+28:26:53.1 |
HIP 23343 |
22.75 |
| 2026-06-12 00:00 |
05:00:21.01 |
+28:27:59.2 |
HIP 23343 |
18.11 |
| 2026-06-12 12:00 |
05:00:52.61 |
+28:29:05.0 |
HIP 23343 |
15.40 |
| 2026-06-13 00:00 |
05:01:24.20 |
+28:30:10.6 |
HIP 23415 |
14.68 |
| 2026-06-13 12:00 |
05:01:55.78 |
+28:31:16.0 |
HIP 23415 |
13.80 |
| 2026-06-14 00:00 |
05:02:27.34 |
+28:32:21.2 |
HIP 23415 |
16.26 |
| 2026-06-14 12:00 |
05:02:58.89 |
+28:33:26.1 |
HIP 23591 |
19.27 |
| 2026-06-15 00:00 |
05:03:30.43 |
+28:34:30.8 |
HIP 23591 |
12.43 |
| 2026-06-15 12:00 |
05:04:01.95 |
+28:35:35.2 |
HIP 23591 |
5.97 |
| 2026-06-16 00:00 |
05:04:33.46 |
+28:36:39.4 |
HIP 23591 |
3.85 |
| 2026-06-16 12:00 |
05:05:04.95 |
+28:37:43.4 |
HIP 23591 |
9.58 |
| 2026-06-17 00:00 |
05:05:36.42 |
+28:38:47.2 |
HIP 23591 |
16.32 |
| 2026-06-17 12:00 |
05:06:07.87 |
+28:39:50.7 |
HIP 23591 |
23.20 |
| 2026-06-18 00:00 |
05:06:39.30 |
+28:40:53.9 |
HIP 23906 |
26.89 |
| 2026-06-18 12:00 |
05:07:10.71 |
+28:41:57.0 |
HIP 23906 |
23.22 |
| 2026-06-19 00:00 |
05:07:42.10 |
+28:42:59.8 |
HIP 23906 |
21.27 |
| 2026-06-19 12:00 |
05:08:13.47 |
+28:44:02.4 |
HIP 23906 |
21.51 |
| 2026-06-20 00:00 |
05:08:44.82 |
+28:45:04.7 |
HIP 23993 |
23.82 |
| 2026-06-20 12:00 |
05:09:16.14 |
+28:46:06.8 |
HIP 23993 |
21.05 |
| 2026-06-21 00:00 |
05:09:47.44 |
+28:47:08.7 |
HIP 23993 |
20.36 |
| 2026-06-21 12:00 |
05:10:18.71 |
+28:48:10.4 |
HIP 24164 |
17.68 |
| 2026-06-22 00:00 |
05:10:49.96 |
+28:49:11.8 |
HIP 24164 |
12.31 |