| Parameter |
Value |
| Designation |
C/1943 W1 (van Gent-Peltier-Daimaca) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1944-01-12T06:19:17.172480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:07Z |
| Obs used |
12 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1943-12-03.0000000 |
| e |
0.99951300 |
| q (au) |
0.874252 |
| a (au) |
1795.167782 |
| i (deg) |
136.183297 |
| Ω (om, deg) |
58.630122 |
| ω (w, deg) |
33.091602 |
| M (ma, deg) |
359.999478 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.549 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.549 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-1.000 |
| 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) |
| 2026-03-26 00:00 |
14:16:00.04 |
-30:19:47.4 |
HIP 69560 |
23.12 |
| 2026-03-26 12:00 |
14:15:58.96 |
-30:19:45.4 |
HIP 69560 |
22.89 |
| 2026-03-27 00:00 |
14:15:57.87 |
-30:19:43.5 |
HIP 69560 |
22.66 |
| 2026-03-27 12:00 |
14:15:56.77 |
-30:19:41.4 |
HIP 69560 |
22.43 |
| 2026-03-28 00:00 |
14:15:55.67 |
-30:19:39.3 |
HIP 69560 |
22.19 |
| 2026-03-28 12:00 |
14:15:54.56 |
-30:19:37.1 |
HIP 69560 |
21.96 |
| 2026-03-29 00:00 |
14:15:53.45 |
-30:19:34.9 |
HIP 69560 |
21.72 |
| 2026-03-29 12:00 |
14:15:52.33 |
-30:19:32.6 |
HIP 69560 |
21.48 |
| 2026-03-30 00:00 |
14:15:51.21 |
-30:19:30.3 |
HIP 69560 |
21.24 |
| 2026-03-30 12:00 |
14:15:50.08 |
-30:19:27.8 |
HIP 69560 |
21.00 |
| 2026-03-31 00:00 |
14:15:48.95 |
-30:19:25.4 |
HIP 69560 |
20.76 |
| 2026-03-31 12:00 |
14:15:47.81 |
-30:19:22.8 |
HIP 69560 |
20.52 |
| 2026-04-01 00:00 |
14:15:46.67 |
-30:19:20.2 |
HIP 69560 |
20.27 |
| 2026-04-01 12:00 |
14:15:45.52 |
-30:19:17.6 |
HIP 69560 |
20.03 |
| 2026-04-02 00:00 |
14:15:44.37 |
-30:19:14.9 |
HIP 69560 |
19.78 |
| 2026-04-02 12:00 |
14:15:43.21 |
-30:19:12.1 |
HIP 69560 |
19.53 |
| 2026-04-03 00:00 |
14:15:42.05 |
-30:19:09.3 |
HIP 69560 |
19.29 |
| 2026-04-03 12:00 |
14:15:40.89 |
-30:19:06.4 |
HIP 69560 |
19.04 |
| 2026-04-04 00:00 |
14:15:39.72 |
-30:19:03.5 |
HIP 69560 |
18.78 |
| 2026-04-04 12:00 |
14:15:38.54 |
-30:19:00.5 |
HIP 69560 |
18.53 |
| 2026-04-05 00:00 |
14:15:37.37 |
-30:18:57.4 |
HIP 69560 |
18.28 |
| 2026-04-05 12:00 |
14:15:36.18 |
-30:18:54.3 |
HIP 69560 |
18.03 |
| 2026-04-06 00:00 |
14:15:35.00 |
-30:18:51.1 |
HIP 69560 |
17.77 |
| 2026-04-06 12:00 |
14:15:33.81 |
-30:18:47.9 |
HIP 69560 |
17.51 |
| 2026-04-07 00:00 |
14:15:32.62 |
-30:18:44.6 |
HIP 69560 |
17.26 |
| 2026-04-07 12:00 |
14:15:31.42 |
-30:18:41.2 |
HIP 69560 |
17.00 |
| 2026-04-08 00:00 |
14:15:30.22 |
-30:18:37.8 |
HIP 69560 |
16.74 |
| 2026-04-08 12:00 |
14:15:29.02 |
-30:18:34.4 |
HIP 69560 |
16.48 |
| 2026-04-09 00:00 |
14:15:27.81 |
-30:18:30.9 |
HIP 69560 |
16.22 |
| 2026-04-09 12:00 |
14:15:26.60 |
-30:18:27.3 |
HIP 69560 |
15.96 |
| 2026-04-10 00:00 |
14:15:25.39 |
-30:18:23.7 |
HIP 69560 |
15.70 |
| 2026-04-10 12:00 |
14:15:24.17 |
-30:18:20.0 |
HIP 69560 |
15.44 |
| 2026-04-11 00:00 |
14:15:22.95 |
-30:18:16.3 |
HIP 69560 |
15.17 |
| 2026-04-11 12:00 |
14:15:21.73 |
-30:18:12.5 |
HIP 69560 |
14.91 |
| 2026-04-12 00:00 |
14:15:20.50 |
-30:18:08.6 |
HIP 69560 |
14.64 |
| 2026-04-12 12:00 |
14:15:19.28 |
-30:18:04.7 |
HIP 69560 |
14.38 |
| 2026-04-13 00:00 |
14:15:18.04 |
-30:18:00.8 |
HIP 69560 |
14.11 |
| 2026-04-13 12:00 |
14:15:16.81 |
-30:17:56.8 |
HIP 69560 |
13.85 |
| 2026-04-14 00:00 |
14:15:15.58 |
-30:17:52.7 |
HIP 69560 |
13.58 |
| 2026-04-14 12:00 |
14:15:14.34 |
-30:17:48.6 |
HIP 69560 |
13.31 |
| 2026-04-15 00:00 |
14:15:13.10 |
-30:17:44.5 |
HIP 69560 |
13.04 |
| 2026-04-15 12:00 |
14:15:11.85 |
-30:17:40.2 |
HIP 69560 |
12.77 |
| 2026-04-16 00:00 |
14:15:10.61 |
-30:17:36.0 |
HIP 69560 |
12.50 |