213P/Van Ness
| Parameter |
Value |
| Designation |
213P/Van Ness |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-09-24T09:09:50.725440Z |
| Orbit solution date (soln_date, UTC) |
2025-04-11T15:15:55Z |
| Obs used |
367 |
| NEO |
- |
| M1 |
10.800 |
| K1 |
16.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-02-12.0000000 |
| e |
0.40755795 |
| q (au) |
1.983344 |
| a (au) |
3.347744 |
| i (deg) |
10.377842 |
| Ω (om, deg) |
311.315921 |
| ω (w, deg) |
5.559827 |
| M (ma, deg) |
22.626485 |
Magnitude
Scatter + Global Linear
$$
M_a = (18.185 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
18.185 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.598 |
| k |
0.800 |
| 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) |
| 2026-02-03 00:00 |
07:22:36.02 |
+25:56:19.0 |
HIP 35664 |
19.41 |
| 2026-02-03 12:00 |
07:22:15.71 |
+25:56:10.8 |
HIP 35664 |
16.48 |
| 2026-02-04 00:00 |
07:21:55.58 |
+25:56:01.9 |
HIP 35664 |
14.46 |
| 2026-02-04 12:00 |
07:21:35.65 |
+25:55:52.4 |
HIP 35664 |
13.70 |
| 2026-02-05 00:00 |
07:21:15.90 |
+25:55:42.2 |
HIP 35664 |
14.36 |
| 2026-02-05 12:00 |
07:20:56.35 |
+25:55:31.3 |
HIP 35624 |
15.47 |
| 2026-02-06 00:00 |
07:20:36.99 |
+25:55:19.7 |
HIP 35624 |
16.31 |
| 2026-02-06 12:00 |
07:20:17.83 |
+25:55:07.5 |
HIP 35624 |
18.16 |
| 2026-02-07 00:00 |
07:19:58.87 |
+25:54:54.6 |
HIP 35435 |
14.47 |
| 2026-02-07 12:00 |
07:19:40.12 |
+25:54:41.1 |
HIP 35435 |
10.33 |
| 2026-02-08 00:00 |
07:19:21.58 |
+25:54:27.0 |
HIP 35435 |
6.34 |
| 2026-02-08 12:00 |
07:19:03.24 |
+25:54:12.2 |
HIP 35435 |
2.96 |
| 2026-02-09 00:00 |
07:18:45.12 |
+25:53:56.8 |
HIP 35435 |
3.36 |
| 2026-02-09 12:00 |
07:18:27.22 |
+25:53:40.7 |
HIP 35435 |
6.83 |
| 2026-02-10 00:00 |
07:18:09.53 |
+25:53:24.0 |
HIP 35435 |
10.66 |
| 2026-02-10 12:00 |
07:17:52.06 |
+25:53:06.7 |
HIP 35435 |
14.53 |
| 2026-02-11 00:00 |
07:17:34.82 |
+25:52:48.8 |
HIP 35435 |
18.38 |
| 2026-02-11 12:00 |
07:17:17.79 |
+25:52:30.3 |
HIP 35435 |
22.20 |
| 2026-02-12 00:00 |
07:17:01.00 |
+25:52:11.2 |
HIP 35070 |
25.43 |
| 2026-02-12 12:00 |
07:16:44.44 |
+25:51:51.4 |
HIP 35070 |
21.72 |
| 2026-02-13 00:00 |
07:16:28.11 |
+25:51:31.1 |
HIP 35070 |
18.07 |
| 2026-02-13 12:00 |
07:16:12.01 |
+25:51:10.2 |
HIP 35070 |
14.50 |
| 2026-02-14 00:00 |
07:15:56.15 |
+25:50:48.7 |
HIP 35070 |
11.02 |
| 2026-02-14 12:00 |
07:15:40.52 |
+25:50:26.6 |
HIP 35070 |
7.70 |
| 2026-02-15 00:00 |
07:15:25.14 |
+25:50:04.0 |
HIP 35070 |
4.75 |
| 2026-02-15 12:00 |
07:15:10.00 |
+25:49:40.8 |
HIP 35070 |
3.18 |
| 2026-02-16 00:00 |
07:14:55.10 |
+25:49:17.0 |
HIP 35070 |
4.57 |
| 2026-02-16 12:00 |
07:14:40.45 |
+25:48:52.7 |
HIP 35070 |
7.34 |
| 2026-02-17 00:00 |
07:14:26.04 |
+25:48:27.8 |
HIP 35070 |
10.39 |
| 2026-02-17 12:00 |
07:14:11.89 |
+25:48:02.3 |
HIP 35070 |
13.49 |
| 2026-02-18 00:00 |
07:13:57.98 |
+25:47:36.4 |
HIP 34861 |
15.68 |
| 2026-02-18 12:00 |
07:13:44.33 |
+25:47:09.9 |
HIP 34861 |
12.57 |
| 2026-02-19 00:00 |
07:13:30.93 |
+25:46:42.8 |
HIP 34861 |
9.52 |
| 2026-02-19 12:00 |
07:13:17.78 |
+25:46:15.3 |
HIP 34861 |
6.53 |
| 2026-02-20 00:00 |
07:13:04.89 |
+25:45:47.2 |
HIP 34861 |
3.60 |
| 2026-02-20 12:00 |
07:12:52.26 |
+25:45:18.6 |
HIP 34861 |
0.76 |
| 2026-02-21 00:00 |
07:12:39.89 |
+25:44:49.5 |
HIP 34861 |
2.14 |
| 2026-02-21 12:00 |
07:12:27.77 |
+25:44:19.9 |
HIP 34861 |
4.90 |
| 2026-02-22 00:00 |
07:12:15.92 |
+25:43:49.8 |
HIP 34861 |
7.61 |
| 2026-02-22 12:00 |
07:12:04.33 |
+25:43:19.3 |
HIP 34861 |
10.27 |
| 2026-02-23 00:00 |
07:11:53.00 |
+25:42:48.2 |
HIP 34861 |
12.87 |
| 2026-02-23 12:00 |
07:11:41.93 |
+25:42:16.7 |
HIP 34861 |
15.42 |
| 2026-02-24 00:00 |
07:11:31.13 |
+25:41:44.7 |
HIP 34861 |
17.91 |