40P/Vaisala 1
Metadata
| Parameter | Value |
|---|---|
| Designation | 40P/Vaisala 1 |
| Type | P |
| Perihelion (tp_cal, UTC) | 2014-11-17T19:36:24.168960Z |
| Orbit solution date (soln_date, UTC) | 2026-07-17T07:41:43Z |
| Obs used | 1268 |
| NEO | - |
| M1 | 11.500 |
| K1 | 13.500 |
| PC | 0.030 |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2011-08-15.0000000 |
| e | 0.63250898 |
| q (au) | 1.802114 |
| a (au) | 4.903831 |
| i (deg) | 11.500129 |
| Ω (om, deg) | 134.484162 |
| ω (w, deg) | 47.307718 |
| M (ma, deg) | 251.919874 |
Magnitude
Scatter + Global Linear
$$ M_a = (9.768 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 9.768 |
| n | 6.000 |
| gf | 0.800 |
| gb | -0.604 |
| k | 1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) | End (UTC) | a | b |
|---|---|---|---|
| 2024-11-29 | 2026-02-13 | +2.9361 | -1.469 |
| 2026-02-13 | 2026-04-06 | +21.0703 | -6.799 |
| 2026-04-06 | 2026-07-20 | -3.3238 | +1.714 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Finding Chart
Ephemeris
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 17:10:20.80 | -13:29:35.2 | HIP 84023 | 13.68 |
| 2026-07-29 12:00 | 17:10:19.26 | -13:32:15.1 | HIP 84023 | 11.20 |
| 2026-07-30 00:00 | 17:10:18.05 | -13:34:54.9 | HIP 84023 | 8.80 |
| 2026-07-30 12:00 | 17:10:17.16 | -13:37:34.7 | HIP 84023 | 6.58 |
| 2026-07-31 00:00 | 17:10:16.60 | -13:40:14.4 | HIP 84023 | 4.77 |
| 2026-07-31 12:00 | 17:10:16.36 | -13:42:54.0 | HIP 84023 | 3.98 |
| 2026-08-01 00:00 | 17:10:16.45 | -13:45:33.4 | HIP 84023 | 4.74 |
| 2026-08-01 12:00 | 17:10:16.86 | -13:48:12.8 | HIP 83997 | 3.53 |
| 2026-08-02 00:00 | 17:10:17.59 | -13:50:52.1 | HIP 83997 | 1.28 |
| 2026-08-02 12:00 | 17:10:18.64 | -13:53:31.2 | HIP 83997 | 2.27 |
| 2026-08-03 00:00 | 17:10:20.01 | -13:56:10.2 | HIP 83997 | 4.80 |
| 2026-08-03 12:00 | 17:10:21.69 | -13:58:49.0 | HIP 83997 | 7.45 |
| 2026-08-04 00:00 | 17:10:23.70 | -14:01:27.7 | HIP 83997 | 10.13 |
| 2026-08-04 12:00 | 17:10:26.02 | -14:04:06.2 | HIP 83997 | 12.83 |
| 2026-08-05 00:00 | 17:10:28.66 | -14:06:44.5 | HIP 83997 | 15.54 |
| 2026-08-05 12:00 | 17:10:31.61 | -14:09:22.7 | HIP 83997 | 18.27 |
| 2026-08-06 00:00 | 17:10:34.87 | -14:12:00.6 | HIP 83997 | 21.02 |
| 2026-08-06 12:00 | 17:10:38.45 | -14:14:38.4 | HIP 83997 | 23.78 |
| 2026-08-07 00:00 | 17:10:42.34 | -14:17:15.9 | HIP 83997 | 26.56 |
| 2026-08-07 12:00 | 17:10:46.53 | -14:19:53.3 | HIP 84132 | 24.60 |
| 2026-08-08 00:00 | 17:10:51.04 | -14:22:30.4 | HIP 84132 | 22.00 |
| 2026-08-08 12:00 | 17:10:55.85 | -14:25:07.2 | HIP 84132 | 19.42 |
| 2026-08-09 00:00 | 17:11:00.97 | -14:27:43.9 | HIP 84132 | 16.87 |
| 2026-08-09 12:00 | 17:11:06.40 | -14:30:20.2 | HIP 84132 | 14.39 |
| 2026-08-10 00:00 | 17:11:12.13 | -14:32:56.4 | HIP 84132 | 12.04 |
| 2026-08-10 12:00 | 17:11:18.17 | -14:35:32.2 | HIP 84132 | 9.94 |
| 2026-08-11 00:00 | 17:11:24.50 | -14:38:07.8 | HIP 84132 | 8.31 |
| 2026-08-11 12:00 | 17:11:31.14 | -14:40:43.0 | HIP 84132 | 7.52 |
| 2026-08-12 00:00 | 17:11:38.08 | -14:43:18.0 | HIP 84132 | 7.86 |
| 2026-08-12 12:00 | 17:11:45.32 | -14:45:52.7 | HIP 84132 | 9.24 |
| 2026-08-13 00:00 | 17:11:52.85 | -14:48:27.1 | HIP 84132 | 11.32 |
| 2026-08-13 12:00 | 17:12:00.68 | -14:51:01.1 | HIP 84132 | 13.81 |
| 2026-08-14 00:00 | 17:12:08.80 | -14:53:34.8 | HIP 84132 | 16.55 |
| 2026-08-14 12:00 | 17:12:17.22 | -14:56:08.2 | HIP 84190 | 14.34 |
| 2026-08-15 00:00 | 17:12:25.92 | -14:58:41.2 | HIP 84190 | 11.34 |
| 2026-08-15 12:00 | 17:12:34.92 | -15:01:13.8 | HIP 84190 | 8.58 |
| 2026-08-16 00:00 | 17:12:44.20 | -15:03:46.1 | HIP 84190 | 6.44 |
| 2026-08-16 12:00 | 17:12:53.77 | -15:06:18.0 | HIP 84190 | 5.72 |
| 2026-08-17 00:00 | 17:13:03.63 | -15:08:49.6 | HIP 84190 | 6.97 |
| 2026-08-17 12:00 | 17:13:13.76 | -15:11:20.7 | HIP 84190 | 9.47 |
| 2026-08-18 00:00 | 17:13:24.18 | -15:13:51.5 | HIP 84190 | 12.53 |
| 2026-08-18 12:00 | 17:13:34.87 | -15:16:21.8 | HIP 84190 | 15.85 |
| 2026-08-19 00:00 | 17:13:45.84 | -15:18:51.7 | HIP 84269 | 14.92 |