408P/Novichonok-Gerke
| Parameter |
Value |
| Designation |
408P/Novichonok-Gerke |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-09-28T03:15:49.726080Z |
| Orbit solution date (soln_date, UTC) |
2025-08-07T09:12:25Z |
| Obs used |
1766 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
14.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-04-10.0000000 |
| e |
0.27128556 |
| q (au) |
3.485699 |
| a (au) |
4.783355 |
| i (deg) |
19.235651 |
| Ω (om, deg) |
189.795782 |
| ω (w, deg) |
224.806417 |
| M (ma, deg) |
275.102372 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.485 + 5.520\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.485 |
| n |
5.520 |
| gf |
0.931 |
| gb |
-0.752 |
| k |
1.000 |
| δ90 |
8.473 |
| 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 |
| 2020-06-20 |
2021-08-29 |
+11.0173 |
-5.838 |
| 2021-08-29 |
2022-09-27 |
+2.6747 |
-1.359 |
| 2022-09-28 |
2025-07-23 |
-1.7437 |
+0.790 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
13:35:25.84 |
-07:37:26.1 |
HIP 66131 |
30.05 |
| 2026-02-03 12:00 |
13:35:27.52 |
-07:36:36.8 |
HIP 66131 |
30.48 |
| 2026-02-04 00:00 |
13:35:29.02 |
-07:35:46.4 |
HIP 66131 |
30.88 |
| 2026-02-04 12:00 |
13:35:30.35 |
-07:34:54.9 |
HIP 66131 |
31.27 |
| 2026-02-05 00:00 |
13:35:31.50 |
-07:34:02.2 |
HIP 66131 |
31.63 |
| 2026-02-05 12:00 |
13:35:32.48 |
-07:33:08.4 |
HIP 66131 |
31.98 |
| 2026-02-06 00:00 |
13:35:33.28 |
-07:32:13.4 |
HIP 66131 |
32.31 |
| 2026-02-06 12:00 |
13:35:33.90 |
-07:31:17.3 |
HIP 66131 |
32.62 |
| 2026-02-07 00:00 |
13:35:34.34 |
-07:30:20.0 |
HIP 66131 |
32.92 |
| 2026-02-07 12:00 |
13:35:34.61 |
-07:29:21.6 |
HIP 66280 |
32.19 |
| 2026-02-08 00:00 |
13:35:34.70 |
-07:28:22.1 |
HIP 66280 |
31.23 |
| 2026-02-08 12:00 |
13:35:34.61 |
-07:27:21.4 |
HIP 66280 |
30.25 |
| 2026-02-09 00:00 |
13:35:34.35 |
-07:26:19.5 |
HIP 66280 |
29.24 |
| 2026-02-09 12:00 |
13:35:33.90 |
-07:25:16.6 |
HIP 66280 |
28.19 |
| 2026-02-10 00:00 |
13:35:33.28 |
-07:24:12.5 |
HIP 66280 |
27.12 |
| 2026-02-10 12:00 |
13:35:32.48 |
-07:23:07.2 |
HIP 66280 |
26.02 |
| 2026-02-11 00:00 |
13:35:31.51 |
-07:22:00.9 |
HIP 66280 |
24.89 |
| 2026-02-11 12:00 |
13:35:30.35 |
-07:20:53.4 |
HIP 66280 |
23.73 |
| 2026-02-12 00:00 |
13:35:29.02 |
-07:19:44.8 |
HIP 66280 |
22.54 |
| 2026-02-12 12:00 |
13:35:27.51 |
-07:18:35.0 |
HIP 66280 |
21.32 |
| 2026-02-13 00:00 |
13:35:25.83 |
-07:17:24.1 |
HIP 66280 |
20.07 |
| 2026-02-13 12:00 |
13:35:23.96 |
-07:16:12.1 |
HIP 66280 |
18.79 |
| 2026-02-14 00:00 |
13:35:21.92 |
-07:14:59.0 |
HIP 66280 |
17.48 |
| 2026-02-14 12:00 |
13:35:19.70 |
-07:13:44.8 |
HIP 66280 |
16.15 |
| 2026-02-15 00:00 |
13:35:17.31 |
-07:12:29.4 |
HIP 66280 |
14.79 |
| 2026-02-15 12:00 |
13:35:14.74 |
-07:11:12.9 |
HIP 66280 |
13.41 |
| 2026-02-16 00:00 |
13:35:11.99 |
-07:09:55.4 |
HIP 66280 |
12.02 |
| 2026-02-16 12:00 |
13:35:09.07 |
-07:08:36.7 |
HIP 66280 |
10.62 |
| 2026-02-17 00:00 |
13:35:05.98 |
-07:07:17.0 |
HIP 66280 |
9.23 |
| 2026-02-17 12:00 |
13:35:02.70 |
-07:05:56.1 |
HIP 66280 |
7.88 |
| 2026-02-18 00:00 |
13:34:59.26 |
-07:04:34.2 |
HIP 66280 |
6.62 |
| 2026-02-18 12:00 |
13:34:55.64 |
-07:03:11.2 |
HIP 66280 |
5.54 |
| 2026-02-19 00:00 |
13:34:51.85 |
-07:01:47.1 |
HIP 66280 |
4.82 |
| 2026-02-19 12:00 |
13:34:47.88 |
-07:00:21.9 |
HIP 66280 |
4.66 |
| 2026-02-20 00:00 |
13:34:43.74 |
-06:58:55.7 |
HIP 66280 |
5.15 |
| 2026-02-20 12:00 |
13:34:39.44 |
-06:57:28.4 |
HIP 66280 |
6.17 |
| 2026-02-21 00:00 |
13:34:34.96 |
-06:56:00.1 |
HIP 66280 |
7.54 |
| 2026-02-21 12:00 |
13:34:30.31 |
-06:54:30.7 |
HIP 66280 |
9.13 |
| 2026-02-22 00:00 |
13:34:25.49 |
-06:53:00.3 |
HIP 66280 |
10.85 |
| 2026-02-22 12:00 |
13:34:20.50 |
-06:51:28.9 |
HIP 66280 |
12.68 |
| 2026-02-23 00:00 |
13:34:15.35 |
-06:49:56.5 |
HIP 66280 |
14.59 |
| 2026-02-23 12:00 |
13:34:10.03 |
-06:48:23.0 |
HIP 66280 |
16.57 |
| 2026-02-24 00:00 |
13:34:04.54 |
-06:46:48.5 |
HIP 66280 |
18.60 |