| Parameter |
Value |
| Designation |
91P/Russell 3 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2005-06-27T02:09:49.521600Z |
| Orbit solution date (soln_date, UTC) |
2021-09-07T13:51:26Z |
| Obs used |
337 |
| NEO |
- |
| M1 |
7.700 |
| K1 |
21.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-04-19.0000000 |
| e |
0.33022414 |
| q (au) |
2.605665 |
| a (au) |
3.890354 |
| i (deg) |
14.092166 |
| Ω (om, deg) |
247.895980 |
| ω (w, deg) |
354.865752 |
| M (ma, deg) |
131.902421 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.424 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.424 |
| n |
2.000 |
| gf |
0.832 |
| gb |
-0.704 |
| k |
0.891 |
| δ90 |
2.147 |
| 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 |
06:53:08.85 |
+12:36:13.1 |
HIP 33204 |
23.84 |
| 2026-06-01 12:00 |
06:53:36.29 |
+12:35:39.6 |
HIP 33204 |
17.51 |
| 2026-06-02 00:00 |
06:54:03.80 |
+12:35:05.4 |
HIP 33204 |
11.62 |
| 2026-06-02 12:00 |
06:54:31.37 |
+12:34:30.6 |
HIP 33204 |
7.34 |
| 2026-06-03 00:00 |
06:54:59.00 |
+12:33:55.0 |
HIP 33204 |
7.99 |
| 2026-06-03 12:00 |
06:55:26.69 |
+12:33:18.8 |
HIP 33352 |
11.20 |
| 2026-06-04 00:00 |
06:55:54.44 |
+12:32:42.0 |
HIP 33352 |
4.82 |
| 2026-06-04 12:00 |
06:56:22.24 |
+12:32:04.4 |
HIP 33352 |
3.69 |
| 2026-06-05 00:00 |
06:56:50.10 |
+12:31:26.1 |
HIP 33352 |
9.86 |
| 2026-06-05 12:00 |
06:57:18.02 |
+12:30:47.2 |
HIP 33352 |
16.57 |
| 2026-06-06 00:00 |
06:57:46.00 |
+12:30:07.6 |
HIP 33352 |
23.38 |
| 2026-06-06 12:00 |
06:58:14.03 |
+12:29:27.3 |
HIP 33352 |
30.22 |
| 2026-06-07 00:00 |
06:58:42.12 |
+12:28:46.3 |
HIP 33748 |
31.64 |
| 2026-06-07 12:00 |
06:59:10.26 |
+12:28:04.7 |
HIP 33748 |
26.15 |
| 2026-06-08 00:00 |
06:59:38.46 |
+12:27:22.3 |
HIP 33748 |
21.49 |
| 2026-06-08 12:00 |
07:00:06.71 |
+12:26:39.3 |
HIP 33748 |
18.32 |
| 2026-06-09 00:00 |
07:00:35.01 |
+12:25:55.5 |
HIP 33748 |
17.49 |
| 2026-06-09 12:00 |
07:01:03.36 |
+12:25:11.1 |
HIP 33748 |
19.31 |
| 2026-06-10 00:00 |
07:01:31.76 |
+12:24:26.0 |
HIP 33910 |
14.87 |
| 2026-06-10 12:00 |
07:02:00.22 |
+12:23:40.2 |
HIP 33910 |
11.64 |
| 2026-06-11 00:00 |
07:02:28.72 |
+12:22:53.6 |
HIP 33910 |
12.16 |
| 2026-06-11 12:00 |
07:02:57.27 |
+12:22:06.4 |
HIP 33917 |
15.92 |
| 2026-06-12 00:00 |
07:03:25.87 |
+12:21:18.5 |
HIP 34055 |
15.66 |
| 2026-06-12 12:00 |
07:03:54.52 |
+12:20:29.9 |
HIP 34055 |
15.17 |
| 2026-06-13 00:00 |
07:04:23.22 |
+12:19:40.5 |
HIP 34157 |
16.41 |
| 2026-06-13 12:00 |
07:04:51.96 |
+12:18:50.5 |
HIP 34157 |
13.26 |
| 2026-06-14 00:00 |
07:05:20.74 |
+12:17:59.8 |
HIP 34157 |
13.49 |
| 2026-06-14 12:00 |
07:05:49.57 |
+12:17:08.3 |
HIP 34157 |
16.99 |
| 2026-06-15 00:00 |
07:06:18.44 |
+12:16:16.2 |
HIP 34157 |
22.27 |
| 2026-06-15 12:00 |
07:06:47.36 |
+12:15:23.3 |
HIP 34157 |
28.37 |
| 2026-06-16 00:00 |
07:07:16.31 |
+12:14:29.8 |
HIP 34512 |
27.01 |
| 2026-06-16 12:00 |
07:07:45.31 |
+12:13:35.5 |
HIP 34512 |
19.88 |
| 2026-06-17 00:00 |
07:08:14.35 |
+12:12:40.5 |
HIP 34512 |
12.74 |
| 2026-06-17 12:00 |
07:08:43.42 |
+12:11:44.8 |
HIP 34512 |
5.63 |
| 2026-06-18 00:00 |
07:09:12.54 |
+12:10:48.4 |
HIP 34512 |
1.94 |
| 2026-06-18 12:00 |
07:09:41.69 |
+12:09:51.3 |
HIP 34512 |
8.89 |
| 2026-06-19 00:00 |
07:10:10.88 |
+12:08:53.5 |
HIP 34512 |
16.06 |
| 2026-06-19 12:00 |
07:10:40.10 |
+12:07:55.0 |
HIP 34549 |
21.50 |
| 2026-06-20 00:00 |
07:11:09.36 |
+12:06:55.8 |
HIP 34549 |
27.26 |
| 2026-06-20 12:00 |
07:11:38.66 |
+12:05:55.8 |
HIP 34823 |
28.64 |
| 2026-06-21 00:00 |
07:12:07.98 |
+12:04:55.2 |
HIP 34823 |
27.46 |
| 2026-06-21 12:00 |
07:12:37.34 |
+12:03:53.8 |
HIP 34960 |
23.62 |
| 2026-06-22 00:00 |
07:13:06.73 |
+12:02:51.8 |
HIP 34960 |
17.10 |