C/1943 W1 (van Gent-Peltier-Daimaca)
| 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) |
| 2026-02-03 00:00 |
14:17:08.35 |
-30:17:33.3 |
HIP 69905 |
22.34 |
| 2026-02-03 12:00 |
14:17:08.18 |
-30:17:37.7 |
HIP 69905 |
22.31 |
| 2026-02-04 00:00 |
14:17:07.99 |
-30:17:42.0 |
HIP 69905 |
22.29 |
| 2026-02-04 12:00 |
14:17:07.80 |
-30:17:46.2 |
HIP 69905 |
22.28 |
| 2026-02-05 00:00 |
14:17:07.60 |
-30:17:50.3 |
HIP 69905 |
22.26 |
| 2026-02-05 12:00 |
14:17:07.38 |
-30:17:54.5 |
HIP 69905 |
22.25 |
| 2026-02-06 00:00 |
14:17:07.16 |
-30:17:58.5 |
HIP 69905 |
22.24 |
| 2026-02-06 12:00 |
14:17:06.92 |
-30:18:02.5 |
HIP 69905 |
22.23 |
| 2026-02-07 00:00 |
14:17:06.67 |
-30:18:06.5 |
HIP 69905 |
22.23 |
| 2026-02-07 12:00 |
14:17:06.42 |
-30:18:10.4 |
HIP 69905 |
22.23 |
| 2026-02-08 00:00 |
14:17:06.15 |
-30:18:14.3 |
HIP 69905 |
22.23 |
| 2026-02-08 12:00 |
14:17:05.87 |
-30:18:18.0 |
HIP 69905 |
22.24 |
| 2026-02-09 00:00 |
14:17:05.58 |
-30:18:21.8 |
HIP 69905 |
22.24 |
| 2026-02-09 12:00 |
14:17:05.28 |
-30:18:25.5 |
HIP 69905 |
22.25 |
| 2026-02-10 00:00 |
14:17:04.96 |
-30:18:29.1 |
HIP 69905 |
22.26 |
| 2026-02-10 12:00 |
14:17:04.64 |
-30:18:32.7 |
HIP 69905 |
22.28 |
| 2026-02-11 00:00 |
14:17:04.31 |
-30:18:36.2 |
HIP 69905 |
22.30 |
| 2026-02-11 12:00 |
14:17:03.96 |
-30:18:39.6 |
HIP 69905 |
22.32 |
| 2026-02-12 00:00 |
14:17:03.61 |
-30:18:43.0 |
HIP 69905 |
22.34 |
| 2026-02-12 12:00 |
14:17:03.24 |
-30:18:46.4 |
HIP 69905 |
22.37 |
| 2026-02-13 00:00 |
14:17:02.87 |
-30:18:49.6 |
HIP 69905 |
22.40 |
| 2026-02-13 12:00 |
14:17:02.48 |
-30:18:52.9 |
HIP 69905 |
22.43 |
| 2026-02-14 00:00 |
14:17:02.08 |
-30:18:56.0 |
HIP 69905 |
22.46 |
| 2026-02-14 12:00 |
14:17:01.67 |
-30:18:59.1 |
HIP 69905 |
22.50 |
| 2026-02-15 00:00 |
14:17:01.25 |
-30:19:02.2 |
HIP 69905 |
22.54 |
| 2026-02-15 12:00 |
14:17:00.82 |
-30:19:05.2 |
HIP 69905 |
22.58 |
| 2026-02-16 00:00 |
14:17:00.38 |
-30:19:08.1 |
HIP 69905 |
22.63 |
| 2026-02-16 12:00 |
14:16:59.93 |
-30:19:11.0 |
HIP 69905 |
22.68 |
| 2026-02-17 00:00 |
14:16:59.47 |
-30:19:13.8 |
HIP 69905 |
22.73 |
| 2026-02-17 12:00 |
14:16:59.00 |
-30:19:16.5 |
HIP 69905 |
22.78 |
| 2026-02-18 00:00 |
14:16:58.52 |
-30:19:19.2 |
HIP 69905 |
22.84 |
| 2026-02-18 12:00 |
14:16:58.03 |
-30:19:21.8 |
HIP 69905 |
22.90 |
| 2026-02-19 00:00 |
14:16:57.53 |
-30:19:24.4 |
HIP 69905 |
22.96 |
| 2026-02-19 12:00 |
14:16:57.01 |
-30:19:26.9 |
HIP 69905 |
23.03 |
| 2026-02-20 00:00 |
14:16:56.49 |
-30:19:29.4 |
HIP 69905 |
23.10 |
| 2026-02-20 12:00 |
14:16:55.96 |
-30:19:31.7 |
HIP 69905 |
23.17 |
| 2026-02-21 00:00 |
14:16:55.41 |
-30:19:34.1 |
HIP 69905 |
23.24 |
| 2026-02-21 12:00 |
14:16:54.86 |
-30:19:36.3 |
HIP 69905 |
23.32 |
| 2026-02-22 00:00 |
14:16:54.30 |
-30:19:38.5 |
HIP 69905 |
23.40 |
| 2026-02-22 12:00 |
14:16:53.73 |
-30:19:40.7 |
HIP 69905 |
23.48 |
| 2026-02-23 00:00 |
14:16:53.14 |
-30:19:42.7 |
HIP 69905 |
23.57 |
| 2026-02-23 12:00 |
14:16:52.55 |
-30:19:44.8 |
HIP 69905 |
23.65 |
| 2026-02-24 00:00 |
14:16:51.95 |
-30:19:46.7 |
HIP 69905 |
23.74 |