422P/Christensen
| Parameter |
Value |
| Designation |
422P/Christensen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2006-05-27T22:01:25.478400Z |
| Orbit solution date (soln_date, UTC) |
2024-07-07T00:42:21Z |
| Obs used |
281 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
18.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2021-06-05T07:45:40.032000Z |
| Discovery magnitude (MPC) |
18.60 R |
| Discovery observatory (MPC) |
Y00 · SONEAR Observatory, Oliveira |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-12-16.0000000 |
| e |
0.50606921 |
| q (au) |
3.092805 |
| a (au) |
6.261616 |
| i (deg) |
39.588451 |
| Ω (om, deg) |
36.088366 |
| ω (w, deg) |
305.989857 |
| M (ma, deg) |
173.555768 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.906 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.906 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
| 2021-06-05 |
2022-11-29 |
+36.3090 |
-19.481 |
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 |
09:24:43.41 |
+62:41:00.0 |
HIP 46144 |
14.72 |
| 2026-02-03 12:00 |
09:24:17.75 |
+62:41:40.7 |
HIP 46144 |
15.55 |
| 2026-02-04 00:00 |
09:23:52.07 |
+62:42:19.5 |
HIP 46144 |
16.86 |
| 2026-02-04 12:00 |
09:23:26.37 |
+62:42:56.4 |
HIP 46144 |
18.55 |
| 2026-02-05 00:00 |
09:23:00.65 |
+62:43:31.4 |
HIP 46144 |
20.51 |
| 2026-02-05 12:00 |
09:22:34.93 |
+62:44:04.5 |
HIP 45797 |
21.30 |
| 2026-02-06 00:00 |
09:22:09.19 |
+62:44:35.7 |
HIP 45797 |
19.57 |
| 2026-02-06 12:00 |
09:21:43.46 |
+62:45:05.0 |
HIP 45797 |
18.15 |
| 2026-02-07 00:00 |
09:21:17.73 |
+62:45:32.3 |
HIP 45797 |
17.11 |
| 2026-02-07 12:00 |
09:20:52.00 |
+62:45:57.7 |
HIP 45693 |
14.28 |
| 2026-02-08 00:00 |
09:20:26.29 |
+62:46:21.1 |
HIP 45693 |
11.39 |
| 2026-02-08 12:00 |
09:20:00.60 |
+62:46:42.6 |
HIP 45693 |
8.56 |
| 2026-02-09 00:00 |
09:19:34.93 |
+62:47:02.2 |
HIP 45693 |
5.89 |
| 2026-02-09 12:00 |
09:19:09.28 |
+62:47:19.9 |
HIP 45693 |
3.70 |
| 2026-02-10 00:00 |
09:18:43.66 |
+62:47:35.6 |
HIP 45693 |
3.19 |
| 2026-02-10 12:00 |
09:18:18.08 |
+62:47:49.3 |
HIP 45693 |
4.91 |
| 2026-02-11 00:00 |
09:17:52.54 |
+62:48:01.2 |
HIP 45693 |
7.43 |
| 2026-02-11 12:00 |
09:17:27.04 |
+62:48:11.1 |
HIP 45693 |
10.18 |
| 2026-02-12 00:00 |
09:17:01.60 |
+62:48:19.0 |
HIP 45693 |
13.00 |
| 2026-02-12 12:00 |
09:16:36.20 |
+62:48:25.0 |
HIP 45693 |
15.84 |
| 2026-02-13 00:00 |
09:16:10.86 |
+62:48:29.1 |
HIP 45277 |
17.21 |
| 2026-02-13 12:00 |
09:15:45.59 |
+62:48:31.2 |
HIP 45277 |
14.36 |
| 2026-02-14 00:00 |
09:15:20.38 |
+62:48:31.4 |
HIP 45277 |
11.53 |
| 2026-02-14 12:00 |
09:14:55.25 |
+62:48:29.7 |
HIP 45277 |
8.74 |
| 2026-02-15 00:00 |
09:14:30.19 |
+62:48:26.1 |
HIP 45277 |
6.02 |
| 2026-02-15 12:00 |
09:14:05.21 |
+62:48:20.5 |
HIP 45277 |
3.52 |
| 2026-02-16 00:00 |
09:13:40.31 |
+62:48:13.0 |
HIP 45277 |
2.18 |
| 2026-02-16 12:00 |
09:13:15.51 |
+62:48:03.6 |
HIP 45277 |
3.62 |
| 2026-02-17 00:00 |
09:12:50.80 |
+62:47:52.3 |
HIP 45277 |
6.12 |
| 2026-02-17 12:00 |
09:12:26.19 |
+62:47:39.1 |
HIP 45277 |
8.80 |
| 2026-02-18 00:00 |
09:12:01.68 |
+62:47:24.0 |
HIP 45277 |
11.53 |
| 2026-02-18 12:00 |
09:11:37.27 |
+62:47:06.9 |
HIP 45277 |
14.29 |
| 2026-02-19 00:00 |
09:11:12.98 |
+62:46:48.0 |
HIP 45277 |
17.04 |
| 2026-02-19 12:00 |
09:10:48.81 |
+62:46:27.3 |
HIP 45277 |
19.80 |
| 2026-02-20 00:00 |
09:10:24.75 |
+62:46:04.6 |
HIP 45027 |
19.28 |
| 2026-02-20 12:00 |
09:10:00.82 |
+62:45:40.1 |
HIP 45027 |
18.96 |
| 2026-02-21 00:00 |
09:09:37.01 |
+62:45:13.7 |
HIP 45027 |
19.01 |
| 2026-02-21 12:00 |
09:09:13.34 |
+62:44:45.5 |
HIP 45027 |
19.43 |
| 2026-02-22 00:00 |
09:08:49.80 |
+62:44:15.4 |
HIP 44678 |
18.37 |
| 2026-02-22 12:00 |
09:08:26.40 |
+62:43:43.5 |
HIP 44678 |
16.13 |
| 2026-02-23 00:00 |
09:08:03.15 |
+62:43:09.8 |
HIP 44678 |
14.09 |
| 2026-02-23 12:00 |
09:07:40.04 |
+62:42:34.3 |
HIP 44678 |
12.35 |
| 2026-02-24 00:00 |
09:07:17.08 |
+62:41:57.0 |
HIP 44678 |
11.03 |