| Parameter |
Value |
| Designation |
451P/Christensen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2007-01-17T03:54:57.801600Z |
| Orbit solution date (soln_date, UTC) |
2023-04-21T18:44:16Z |
| Obs used |
157 |
| NEO |
- |
| M1 |
11.600 |
| K1 |
15.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2006-11-24T10:39:07.776000Z |
| Discovery magnitude (MPC) |
20.10 N |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-01-11.0000000 |
| e |
0.55743773 |
| q (au) |
2.795689 |
| a (au) |
6.317053 |
| i (deg) |
26.493684 |
| Ω (om, deg) |
301.041988 |
| ω (w, deg) |
186.900815 |
| M (ma, deg) |
67.654045 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.305 + 3.229\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.305 |
| n |
3.229 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.999 |
| 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) |
| 2026-09-20 00:00 |
17:37:04.44 |
-36:35:38.9 |
HIP 86126 |
16.27 |
| 2026-09-20 12:00 |
17:37:10.57 |
-36:34:28.0 |
HIP 86126 |
17.98 |
| 2026-09-21 00:00 |
17:37:16.84 |
-36:33:17.3 |
HIP 86126 |
19.70 |
| 2026-09-21 12:00 |
17:37:23.25 |
-36:32:06.8 |
HIP 86309 |
20.05 |
| 2026-09-22 00:00 |
17:37:29.81 |
-36:30:56.6 |
HIP 86309 |
18.42 |
| 2026-09-22 12:00 |
17:37:36.50 |
-36:29:46.6 |
HIP 86309 |
16.82 |
| 2026-09-23 00:00 |
17:37:43.33 |
-36:28:36.9 |
HIP 86309 |
15.24 |
| 2026-09-23 12:00 |
17:37:50.30 |
-36:27:27.4 |
HIP 86309 |
13.72 |
| 2026-09-24 00:00 |
17:37:57.41 |
-36:26:18.2 |
HIP 86309 |
12.28 |
| 2026-09-24 12:00 |
17:38:04.65 |
-36:25:09.2 |
HIP 86309 |
10.97 |
| 2026-09-25 00:00 |
17:38:12.03 |
-36:24:00.5 |
HIP 86309 |
9.83 |
| 2026-09-25 12:00 |
17:38:19.55 |
-36:22:52.1 |
HIP 86309 |
8.96 |
| 2026-09-26 00:00 |
17:38:27.20 |
-36:21:43.9 |
HIP 86309 |
8.45 |
| 2026-09-26 12:00 |
17:38:34.99 |
-36:20:35.9 |
HIP 86309 |
8.38 |
| 2026-09-27 00:00 |
17:38:42.90 |
-36:19:28.3 |
HIP 86309 |
8.77 |
| 2026-09-27 12:00 |
17:38:50.96 |
-36:18:20.8 |
HIP 86309 |
9.58 |
| 2026-09-28 00:00 |
17:38:59.14 |
-36:17:13.7 |
HIP 86434 |
7.94 |
| 2026-09-28 12:00 |
17:39:07.45 |
-36:16:06.7 |
HIP 86434 |
6.13 |
| 2026-09-29 00:00 |
17:39:15.90 |
-36:15:00.1 |
HIP 86434 |
4.47 |
| 2026-09-29 12:00 |
17:39:24.47 |
-36:13:53.7 |
HIP 86434 |
3.23 |
| 2026-09-30 00:00 |
17:39:33.18 |
-36:12:47.6 |
HIP 86434 |
3.04 |
| 2026-09-30 12:00 |
17:39:42.01 |
-36:11:41.7 |
HIP 86434 |
4.08 |
| 2026-10-01 00:00 |
17:39:50.97 |
-36:10:36.1 |
HIP 86434 |
5.74 |
| 2026-10-01 12:00 |
17:40:00.06 |
-36:09:30.7 |
HIP 86434 |
7.64 |
| 2026-10-02 00:00 |
17:40:09.27 |
-36:08:25.6 |
HIP 86434 |
9.65 |
| 2026-10-02 12:00 |
17:40:18.62 |
-36:07:20.8 |
HIP 86434 |
11.72 |
| 2026-10-03 00:00 |
17:40:28.08 |
-36:06:16.2 |
HIP 86434 |
13.85 |
| 2026-10-03 12:00 |
17:40:37.68 |
-36:05:11.9 |
HIP 86434 |
16.00 |
| 2026-10-04 00:00 |
17:40:47.39 |
-36:04:07.8 |
HIP 86434 |
18.19 |
| 2026-10-04 12:00 |
17:40:57.24 |
-36:03:04.0 |
HIP 86434 |
20.41 |
| 2026-10-05 00:00 |
17:41:07.20 |
-36:02:00.5 |
HIP 86653 |
20.00 |
| 2026-10-05 12:00 |
17:41:17.29 |
-36:00:57.2 |
HIP 86653 |
17.82 |
| 2026-10-06 00:00 |
17:41:27.50 |
-35:59:54.2 |
HIP 86653 |
15.65 |
| 2026-10-06 12:00 |
17:41:37.83 |
-35:58:51.4 |
HIP 86653 |
13.52 |
| 2026-10-07 00:00 |
17:41:48.28 |
-35:57:48.9 |
HIP 86653 |
11.46 |
| 2026-10-07 12:00 |
17:41:58.85 |
-35:56:46.7 |
HIP 86653 |
9.54 |
| 2026-10-08 00:00 |
17:42:09.54 |
-35:55:44.7 |
HIP 86653 |
7.87 |
| 2026-10-08 12:00 |
17:42:20.35 |
-35:54:43.0 |
HIP 86653 |
6.66 |
| 2026-10-09 00:00 |
17:42:31.28 |
-35:53:41.5 |
HIP 86653 |
6.23 |
| 2026-10-09 12:00 |
17:42:42.32 |
-35:52:40.3 |
HIP 86653 |
6.74 |
| 2026-10-10 00:00 |
17:42:53.48 |
-35:51:39.4 |
HIP 86653 |
8.03 |
| 2026-10-10 12:00 |
17:43:04.75 |
-35:50:38.7 |
HIP 86653 |
9.81 |
| 2026-10-11 00:00 |
17:43:16.14 |
-35:49:38.3 |
HIP 86653 |
11.88 |