| 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 |
-0.996 |
| 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) |
| 2026-07-29 00:00 |
14:12:14.60 |
-29:55:51.4 |
HIP 69360 |
5.83 |
| 2026-07-29 12:00 |
14:12:14.60 |
-29:55:46.7 |
HIP 69360 |
5.81 |
| 2026-07-30 00:00 |
14:12:14.61 |
-29:55:42.1 |
HIP 69360 |
5.78 |
| 2026-07-30 12:00 |
14:12:14.64 |
-29:55:37.6 |
HIP 69360 |
5.77 |
| 2026-07-31 00:00 |
14:12:14.67 |
-29:55:33.0 |
HIP 69360 |
5.75 |
| 2026-07-31 12:00 |
14:12:14.72 |
-29:55:28.6 |
HIP 69360 |
5.74 |
| 2026-08-01 00:00 |
14:12:14.77 |
-29:55:24.2 |
HIP 69360 |
5.73 |
| 2026-08-01 12:00 |
14:12:14.84 |
-29:55:19.8 |
HIP 69360 |
5.72 |
| 2026-08-02 00:00 |
14:12:14.91 |
-29:55:15.5 |
HIP 69360 |
5.72 |
| 2026-08-02 12:00 |
14:12:15.00 |
-29:55:11.2 |
HIP 69360 |
5.72 |
| 2026-08-03 00:00 |
14:12:15.09 |
-29:55:07.0 |
HIP 69360 |
5.73 |
| 2026-08-03 12:00 |
14:12:15.20 |
-29:55:02.8 |
HIP 69360 |
5.74 |
| 2026-08-04 00:00 |
14:12:15.31 |
-29:54:58.7 |
HIP 69360 |
5.75 |
| 2026-08-04 12:00 |
14:12:15.44 |
-29:54:54.6 |
HIP 69360 |
5.76 |
| 2026-08-05 00:00 |
14:12:15.58 |
-29:54:50.6 |
HIP 69360 |
5.78 |
| 2026-08-05 12:00 |
14:12:15.72 |
-29:54:46.6 |
HIP 69360 |
5.80 |
| 2026-08-06 00:00 |
14:12:15.88 |
-29:54:42.7 |
HIP 69360 |
5.82 |
| 2026-08-06 12:00 |
14:12:16.05 |
-29:54:38.8 |
HIP 69360 |
5.85 |
| 2026-08-07 00:00 |
14:12:16.23 |
-29:54:35.0 |
HIP 69360 |
5.88 |
| 2026-08-07 12:00 |
14:12:16.41 |
-29:54:31.2 |
HIP 69360 |
5.91 |
| 2026-08-08 00:00 |
14:12:16.61 |
-29:54:27.5 |
HIP 69360 |
5.95 |
| 2026-08-08 12:00 |
14:12:16.82 |
-29:54:23.9 |
HIP 69360 |
5.99 |
| 2026-08-09 00:00 |
14:12:17.04 |
-29:54:20.2 |
HIP 69360 |
6.03 |
| 2026-08-09 12:00 |
14:12:17.27 |
-29:54:16.7 |
HIP 69360 |
6.08 |
| 2026-08-10 00:00 |
14:12:17.50 |
-29:54:13.2 |
HIP 69360 |
6.12 |
| 2026-08-10 12:00 |
14:12:17.75 |
-29:54:09.7 |
HIP 69360 |
6.18 |
| 2026-08-11 00:00 |
14:12:18.01 |
-29:54:06.3 |
HIP 69360 |
6.23 |
| 2026-08-11 12:00 |
14:12:18.28 |
-29:54:03.0 |
HIP 69360 |
6.29 |
| 2026-08-12 00:00 |
14:12:18.56 |
-29:53:59.7 |
HIP 69360 |
6.35 |
| 2026-08-12 12:00 |
14:12:18.85 |
-29:53:56.5 |
HIP 69360 |
6.41 |
| 2026-08-13 00:00 |
14:12:19.15 |
-29:53:53.3 |
HIP 69360 |
6.47 |
| 2026-08-13 12:00 |
14:12:19.46 |
-29:53:50.2 |
HIP 69360 |
6.54 |
| 2026-08-14 00:00 |
14:12:19.78 |
-29:53:47.1 |
HIP 69360 |
6.61 |
| 2026-08-14 12:00 |
14:12:20.10 |
-29:53:44.1 |
HIP 69360 |
6.68 |
| 2026-08-15 00:00 |
14:12:20.44 |
-29:53:41.1 |
HIP 69360 |
6.76 |
| 2026-08-15 12:00 |
14:12:20.79 |
-29:53:38.2 |
HIP 69360 |
6.83 |
| 2026-08-16 00:00 |
14:12:21.15 |
-29:53:35.4 |
HIP 69360 |
6.91 |
| 2026-08-16 12:00 |
14:12:21.52 |
-29:53:32.6 |
HIP 69360 |
6.99 |
| 2026-08-17 00:00 |
14:12:21.90 |
-29:53:29.9 |
HIP 69360 |
7.08 |
| 2026-08-17 12:00 |
14:12:22.29 |
-29:53:27.2 |
HIP 69360 |
7.16 |
| 2026-08-18 00:00 |
14:12:22.68 |
-29:53:24.6 |
HIP 69360 |
7.25 |
| 2026-08-18 12:00 |
14:12:23.09 |
-29:53:22.0 |
HIP 69360 |
7.34 |
| 2026-08-19 00:00 |
14:12:23.51 |
-29:53:19.5 |
HIP 69360 |
7.44 |