| 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 |
-0.501 |
| 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) |
| 2026-06-01 00:00 |
09:02:47.63 |
+55:43:59.6 |
HIP 44289 |
15.51 |
| 2026-06-01 12:00 |
09:03:04.63 |
+55:41:28.0 |
HIP 44289 |
18.87 |
| 2026-06-02 00:00 |
09:03:21.74 |
+55:38:56.6 |
HIP 44638 |
21.63 |
| 2026-06-02 12:00 |
09:03:38.96 |
+55:36:25.4 |
HIP 44638 |
18.57 |
| 2026-06-03 00:00 |
09:03:56.30 |
+55:33:54.5 |
HIP 44638 |
15.68 |
| 2026-06-03 12:00 |
09:04:13.74 |
+55:31:23.8 |
HIP 44638 |
13.07 |
| 2026-06-04 00:00 |
09:04:31.30 |
+55:28:53.3 |
HIP 44638 |
10.97 |
| 2026-06-04 12:00 |
09:04:48.96 |
+55:26:23.1 |
HIP 44638 |
9.70 |
| 2026-06-05 00:00 |
09:05:06.72 |
+55:23:53.1 |
HIP 44654 |
7.07 |
| 2026-06-05 12:00 |
09:05:24.60 |
+55:21:23.3 |
HIP 44654 |
4.94 |
| 2026-06-06 00:00 |
09:05:42.57 |
+55:18:53.8 |
HIP 44654 |
4.90 |
| 2026-06-06 12:00 |
09:06:00.65 |
+55:16:24.6 |
HIP 44654 |
7.00 |
| 2026-06-07 00:00 |
09:06:18.84 |
+55:13:55.6 |
HIP 44654 |
9.98 |
| 2026-06-07 12:00 |
09:06:37.12 |
+55:11:26.9 |
HIP 44654 |
13.27 |
| 2026-06-08 00:00 |
09:06:55.50 |
+55:08:58.4 |
HIP 44871 |
14.64 |
| 2026-06-08 12:00 |
09:07:13.99 |
+55:06:30.2 |
HIP 44871 |
11.56 |
| 2026-06-09 00:00 |
09:07:32.57 |
+55:04:02.3 |
HIP 44871 |
8.89 |
| 2026-06-09 12:00 |
09:07:51.25 |
+55:01:34.6 |
HIP 44871 |
7.09 |
| 2026-06-10 00:00 |
09:08:10.03 |
+54:59:07.2 |
HIP 44871 |
6.91 |
| 2026-06-10 12:00 |
09:08:28.90 |
+54:56:40.1 |
HIP 44871 |
8.46 |
| 2026-06-11 00:00 |
09:08:47.87 |
+54:54:13.3 |
HIP 44871 |
11.05 |
| 2026-06-11 12:00 |
09:09:06.93 |
+54:51:46.8 |
HIP 45022 |
11.81 |
| 2026-06-12 00:00 |
09:09:26.08 |
+54:49:20.5 |
HIP 45022 |
11.59 |
| 2026-06-12 12:00 |
09:09:45.32 |
+54:46:54.6 |
HIP 45022 |
12.49 |
| 2026-06-13 00:00 |
09:10:04.66 |
+54:44:28.9 |
HIP 45022 |
14.30 |
| 2026-06-13 12:00 |
09:10:24.08 |
+54:42:03.5 |
HIP 44998 |
13.37 |
| 2026-06-14 00:00 |
09:10:43.60 |
+54:39:38.5 |
HIP 44998 |
12.41 |
| 2026-06-14 12:00 |
09:11:03.20 |
+54:37:13.7 |
HIP 44998 |
12.55 |
| 2026-06-15 00:00 |
09:11:22.88 |
+54:34:49.3 |
HIP 44998 |
13.75 |
| 2026-06-15 12:00 |
09:11:42.65 |
+54:32:25.2 |
HIP 44998 |
15.79 |
| 2026-06-16 00:00 |
09:12:02.51 |
+54:30:01.4 |
HIP 44998 |
18.38 |
| 2026-06-16 12:00 |
09:12:22.45 |
+54:27:37.9 |
HIP 44998 |
21.34 |
| 2026-06-17 00:00 |
09:12:42.47 |
+54:25:14.7 |
HIP 44998 |
24.54 |
| 2026-06-17 12:00 |
09:13:02.57 |
+54:22:51.9 |
HIP 45337 |
22.04 |
| 2026-06-18 00:00 |
09:13:22.75 |
+54:20:29.4 |
HIP 45337 |
18.51 |
| 2026-06-18 12:00 |
09:13:43.01 |
+54:18:07.3 |
HIP 45337 |
15.11 |
| 2026-06-19 00:00 |
09:14:03.35 |
+54:15:45.5 |
HIP 45337 |
11.94 |
| 2026-06-19 12:00 |
09:14:23.76 |
+54:13:24.0 |
HIP 45337 |
9.26 |
| 2026-06-20 00:00 |
09:14:44.25 |
+54:11:02.9 |
HIP 45337 |
7.63 |
| 2026-06-20 12:00 |
09:15:04.82 |
+54:08:42.1 |
HIP 45337 |
7.74 |
| 2026-06-21 00:00 |
09:15:25.45 |
+54:06:21.7 |
HIP 45493 |
8.41 |
| 2026-06-21 12:00 |
09:15:46.16 |
+54:04:01.7 |
HIP 45493 |
4.59 |
| 2026-06-22 00:00 |
09:16:06.94 |
+54:01:42.0 |
HIP 45493 |
0.75 |