C/1996 P2 (Russell-Watson)
| 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 |
0.977 |
| 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) |
| 2026-02-03 00:00 |
05:54:04.14 |
+16:43:41.5 |
HIP 27805 |
27.29 |
| 2026-02-03 12:00 |
05:54:02.50 |
+16:43:44.8 |
HIP 27805 |
27.13 |
| 2026-02-04 00:00 |
05:54:00.88 |
+16:43:48.1 |
HIP 27805 |
26.97 |
| 2026-02-04 12:00 |
05:53:59.27 |
+16:43:51.4 |
HIP 27805 |
26.82 |
| 2026-02-05 00:00 |
05:53:57.68 |
+16:43:54.8 |
HIP 27805 |
26.68 |
| 2026-02-05 12:00 |
05:53:56.10 |
+16:43:58.2 |
HIP 27805 |
26.54 |
| 2026-02-06 00:00 |
05:53:54.54 |
+16:44:01.6 |
HIP 27805 |
26.41 |
| 2026-02-06 12:00 |
05:53:53.00 |
+16:44:05.0 |
HIP 27805 |
26.29 |
| 2026-02-07 00:00 |
05:53:51.47 |
+16:44:08.5 |
HIP 27805 |
26.18 |
| 2026-02-07 12:00 |
05:53:49.96 |
+16:44:12.0 |
HIP 27805 |
26.07 |
| 2026-02-08 00:00 |
05:53:48.46 |
+16:44:15.5 |
HIP 27805 |
25.97 |
| 2026-02-08 12:00 |
05:53:46.99 |
+16:44:19.0 |
HIP 27805 |
25.87 |
| 2026-02-09 00:00 |
05:53:45.52 |
+16:44:22.6 |
HIP 27805 |
25.78 |
| 2026-02-09 12:00 |
05:53:44.08 |
+16:44:26.1 |
HIP 27805 |
25.70 |
| 2026-02-10 00:00 |
05:53:42.65 |
+16:44:29.7 |
HIP 27805 |
25.63 |
| 2026-02-10 12:00 |
05:53:41.24 |
+16:44:33.4 |
HIP 27805 |
25.56 |
| 2026-02-11 00:00 |
05:53:39.85 |
+16:44:37.0 |
HIP 27805 |
25.50 |
| 2026-02-11 12:00 |
05:53:38.47 |
+16:44:40.7 |
HIP 27805 |
25.44 |
| 2026-02-12 00:00 |
05:53:37.12 |
+16:44:44.4 |
HIP 27805 |
25.39 |
| 2026-02-12 12:00 |
05:53:35.78 |
+16:44:48.1 |
HIP 27805 |
25.35 |
| 2026-02-13 00:00 |
05:53:34.45 |
+16:44:51.8 |
HIP 27805 |
25.31 |
| 2026-02-13 12:00 |
05:53:33.15 |
+16:44:55.6 |
HIP 27805 |
25.27 |
| 2026-02-14 00:00 |
05:53:31.86 |
+16:44:59.3 |
HIP 27805 |
25.25 |
| 2026-02-14 12:00 |
05:53:30.59 |
+16:45:03.1 |
HIP 27805 |
25.23 |
| 2026-02-15 00:00 |
05:53:29.34 |
+16:45:07.0 |
HIP 27805 |
25.21 |
| 2026-02-15 12:00 |
05:53:28.11 |
+16:45:10.8 |
HIP 27805 |
25.20 |
| 2026-02-16 00:00 |
05:53:26.90 |
+16:45:14.7 |
HIP 27805 |
25.19 |
| 2026-02-16 12:00 |
05:53:25.70 |
+16:45:18.5 |
HIP 27805 |
25.19 |
| 2026-02-17 00:00 |
05:53:24.53 |
+16:45:22.4 |
HIP 27805 |
25.19 |
| 2026-02-17 12:00 |
05:53:23.37 |
+16:45:26.3 |
HIP 27805 |
25.20 |
| 2026-02-18 00:00 |
05:53:22.23 |
+16:45:30.3 |
HIP 27805 |
25.21 |
| 2026-02-18 12:00 |
05:53:21.11 |
+16:45:34.2 |
HIP 27805 |
25.23 |
| 2026-02-19 00:00 |
05:53:20.01 |
+16:45:38.2 |
HIP 27805 |
25.25 |
| 2026-02-19 12:00 |
05:53:18.92 |
+16:45:42.2 |
HIP 27805 |
25.27 |
| 2026-02-20 00:00 |
05:53:17.86 |
+16:45:46.2 |
HIP 27805 |
25.30 |
| 2026-02-20 12:00 |
05:53:16.82 |
+16:45:50.2 |
HIP 27805 |
25.33 |
| 2026-02-21 00:00 |
05:53:15.79 |
+16:45:54.3 |
HIP 27805 |
25.36 |
| 2026-02-21 12:00 |
05:53:14.78 |
+16:45:58.3 |
HIP 27805 |
25.40 |
| 2026-02-22 00:00 |
05:53:13.80 |
+16:46:02.4 |
HIP 27805 |
25.44 |
| 2026-02-22 12:00 |
05:53:12.83 |
+16:46:06.5 |
HIP 27805 |
25.49 |
| 2026-02-23 00:00 |
05:53:11.88 |
+16:46:10.6 |
HIP 27805 |
25.54 |
| 2026-02-23 12:00 |
05:53:10.96 |
+16:46:14.7 |
HIP 27805 |
25.59 |
| 2026-02-24 00:00 |
05:53:10.05 |
+16:46:18.9 |
HIP 27805 |
25.64 |