| Parameter |
Value |
| Designation |
C/1996 P2 (Russell-Watson) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1996-03-01T07:54:27.348480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:50Z |
| Obs used |
157 |
| NEO |
- |
| M1 |
5.000 |
| K1 |
12.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1996-11-19.0000000 |
| e |
1.00008354 |
| q (au) |
2.005854 |
| a (au) |
-24011.991404 |
| i (deg) |
29.083130 |
| Ω (om, deg) |
101.403478 |
| ω (w, deg) |
188.799531 |
| M (ma, deg) |
0.000070 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.223 + 4.641\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.223 |
| n |
4.641 |
| gf |
0.998 |
| gb |
-1.000 |
| k |
0.999 |
| 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) |
| 2026-07-29 00:00 |
06:00:26.29 |
+16:59:11.5 |
HIP 28509 |
9.41 |
| 2026-07-29 12:00 |
06:00:28.21 |
+16:59:10.0 |
HIP 28509 |
8.95 |
| 2026-07-30 00:00 |
06:00:30.11 |
+16:59:08.3 |
HIP 28509 |
8.50 |
| 2026-07-30 12:00 |
06:00:32.01 |
+16:59:06.7 |
HIP 28509 |
8.05 |
| 2026-07-31 00:00 |
06:00:33.89 |
+16:59:05.0 |
HIP 28509 |
7.60 |
| 2026-07-31 12:00 |
06:00:35.76 |
+16:59:03.3 |
HIP 28509 |
7.15 |
| 2026-08-01 00:00 |
06:00:37.62 |
+16:59:01.6 |
HIP 28509 |
6.71 |
| 2026-08-01 12:00 |
06:00:39.47 |
+16:58:59.9 |
HIP 28509 |
6.27 |
| 2026-08-02 00:00 |
06:00:41.30 |
+16:58:58.1 |
HIP 28509 |
5.84 |
| 2026-08-02 12:00 |
06:00:43.13 |
+16:58:56.3 |
HIP 28509 |
5.41 |
| 2026-08-03 00:00 |
06:00:44.94 |
+16:58:54.5 |
HIP 28509 |
4.98 |
| 2026-08-03 12:00 |
06:00:46.74 |
+16:58:52.6 |
HIP 28509 |
4.56 |
| 2026-08-04 00:00 |
06:00:48.53 |
+16:58:50.8 |
HIP 28509 |
4.14 |
| 2026-08-04 12:00 |
06:00:50.30 |
+16:58:48.9 |
HIP 28509 |
3.72 |
| 2026-08-05 00:00 |
06:00:52.07 |
+16:58:46.9 |
HIP 28509 |
3.32 |
| 2026-08-05 12:00 |
06:00:53.82 |
+16:58:45.0 |
HIP 28509 |
2.92 |
| 2026-08-06 00:00 |
06:00:55.56 |
+16:58:43.0 |
HIP 28509 |
2.53 |
| 2026-08-06 12:00 |
06:00:57.28 |
+16:58:41.0 |
HIP 28509 |
2.15 |
| 2026-08-07 00:00 |
06:00:58.99 |
+16:58:39.0 |
HIP 28509 |
1.79 |
| 2026-08-07 12:00 |
06:01:00.69 |
+16:58:37.0 |
HIP 28509 |
1.47 |
| 2026-08-08 00:00 |
06:01:02.38 |
+16:58:34.9 |
HIP 28509 |
1.19 |
| 2026-08-08 12:00 |
06:01:04.05 |
+16:58:32.8 |
HIP 28509 |
1.01 |
| 2026-08-09 00:00 |
06:01:05.71 |
+16:58:30.7 |
HIP 28509 |
0.98 |
| 2026-08-09 12:00 |
06:01:07.35 |
+16:58:28.6 |
HIP 28509 |
1.09 |
| 2026-08-10 00:00 |
06:01:08.98 |
+16:58:26.4 |
HIP 28509 |
1.32 |
| 2026-08-10 12:00 |
06:01:10.60 |
+16:58:24.2 |
HIP 28509 |
1.61 |
| 2026-08-11 00:00 |
06:01:12.20 |
+16:58:22.0 |
HIP 28509 |
1.93 |
| 2026-08-11 12:00 |
06:01:13.79 |
+16:58:19.8 |
HIP 28509 |
2.27 |
| 2026-08-12 00:00 |
06:01:15.37 |
+16:58:17.6 |
HIP 28509 |
2.62 |
| 2026-08-12 12:00 |
06:01:16.93 |
+16:58:15.3 |
HIP 28509 |
2.97 |
| 2026-08-13 00:00 |
06:01:18.48 |
+16:58:13.0 |
HIP 28509 |
3.33 |
| 2026-08-13 12:00 |
06:01:20.01 |
+16:58:10.7 |
HIP 28509 |
3.68 |
| 2026-08-14 00:00 |
06:01:21.52 |
+16:58:08.4 |
HIP 28509 |
4.03 |
| 2026-08-14 12:00 |
06:01:23.03 |
+16:58:06.0 |
HIP 28509 |
4.39 |
| 2026-08-15 00:00 |
06:01:24.51 |
+16:58:03.6 |
HIP 28556 |
4.16 |
| 2026-08-15 12:00 |
06:01:25.98 |
+16:58:01.2 |
HIP 28556 |
3.83 |
| 2026-08-16 00:00 |
06:01:27.44 |
+16:57:58.8 |
HIP 28556 |
3.52 |
| 2026-08-16 12:00 |
06:01:28.88 |
+16:57:56.4 |
HIP 28556 |
3.21 |
| 2026-08-17 00:00 |
06:01:30.31 |
+16:57:54.0 |
HIP 28556 |
2.92 |
| 2026-08-17 12:00 |
06:01:31.72 |
+16:57:51.5 |
HIP 28556 |
2.64 |
| 2026-08-18 00:00 |
06:01:33.11 |
+16:57:49.0 |
HIP 28556 |
2.37 |
| 2026-08-18 12:00 |
06:01:34.49 |
+16:57:46.5 |
HIP 28556 |
2.13 |
| 2026-08-19 00:00 |
06:01:35.85 |
+16:57:44.0 |
HIP 28556 |
1.92 |