266P/Christensen
| Parameter |
Value |
| Designation |
266P/Christensen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-04-19T20:13:28.701120Z |
| Orbit solution date (soln_date, UTC) |
2021-05-04T16:40:00Z |
| Obs used |
520 |
| NEO |
- |
| M1 |
11.000 |
| K1 |
16.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-06-27.0000000 |
| e |
0.33964561 |
| q (au) |
2.332338 |
| a (au) |
3.531948 |
| i (deg) |
3.427133 |
| Ω (om, deg) |
5.003630 |
| ω (w, deg) |
98.009686 |
| M (ma, deg) |
207.380781 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.294 + 5.175\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.294 |
| n |
5.175 |
| gf |
0.862 |
| gb |
-0.500 |
| k |
0.898 |
| δ90 |
1.451 |
| 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) |
| 2026-02-03 00:00 |
00:18:02.37 |
+02:47:35.2 |
HIP 1384 |
21.83 |
| 2026-02-03 12:00 |
00:18:37.72 |
+02:51:37.7 |
HIP 1609 |
25.17 |
| 2026-02-04 00:00 |
00:19:13.20 |
+02:55:40.9 |
HIP 1609 |
15.42 |
| 2026-02-04 12:00 |
00:19:48.80 |
+02:59:44.8 |
HIP 1609 |
5.65 |
| 2026-02-05 00:00 |
00:20:24.54 |
+03:03:49.5 |
HIP 1609 |
4.16 |
| 2026-02-05 12:00 |
00:21:00.40 |
+03:07:54.9 |
HIP 1609 |
14.00 |
| 2026-02-06 00:00 |
00:21:36.39 |
+03:12:01.1 |
HIP 1653 |
19.92 |
| 2026-02-06 12:00 |
00:22:12.50 |
+03:16:07.9 |
HIP 1653 |
24.69 |
| 2026-02-07 00:00 |
00:22:48.74 |
+03:20:15.5 |
HIP 1943 |
26.26 |
| 2026-02-07 12:00 |
00:23:25.11 |
+03:24:23.8 |
HIP 1943 |
17.20 |
| 2026-02-08 00:00 |
00:24:01.60 |
+03:28:32.7 |
HIP 1943 |
10.04 |
| 2026-02-08 12:00 |
00:24:38.21 |
+03:32:42.4 |
HIP 1943 |
10.32 |
| 2026-02-09 00:00 |
00:25:14.94 |
+03:36:52.7 |
HIP 1943 |
17.74 |
| 2026-02-09 12:00 |
00:25:51.80 |
+03:41:03.8 |
HIP 2080 |
10.48 |
| 2026-02-10 00:00 |
00:26:28.78 |
+03:45:15.5 |
HIP 2080 |
5.27 |
| 2026-02-10 12:00 |
00:27:05.88 |
+03:49:27.8 |
HIP 2080 |
12.32 |
| 2026-02-11 00:00 |
00:27:43.10 |
+03:53:40.8 |
HIP 2080 |
22.00 |
| 2026-02-11 12:00 |
00:28:20.44 |
+03:57:54.5 |
HIP 2080 |
32.03 |
| 2026-02-12 00:00 |
00:28:57.90 |
+04:02:08.8 |
HIP 2391 |
29.15 |
| 2026-02-12 12:00 |
00:29:35.48 |
+04:06:23.7 |
HIP 2391 |
19.34 |
| 2026-02-13 00:00 |
00:30:13.18 |
+04:10:39.3 |
HIP 2391 |
10.48 |
| 2026-02-13 12:00 |
00:30:50.99 |
+04:14:55.5 |
HIP 2391 |
7.67 |
| 2026-02-14 00:00 |
00:31:28.92 |
+04:19:12.3 |
HIP 2391 |
14.93 |
| 2026-02-14 12:00 |
00:32:06.97 |
+04:23:29.7 |
HIP 2391 |
24.57 |
| 2026-02-15 00:00 |
00:32:45.13 |
+04:27:47.7 |
HIP 2510 |
26.80 |
| 2026-02-15 12:00 |
00:33:23.41 |
+04:32:06.3 |
HIP 2659 |
25.15 |
| 2026-02-16 00:00 |
00:34:01.80 |
+04:36:25.5 |
HIP 2736 |
19.36 |
| 2026-02-16 12:00 |
00:34:40.31 |
+04:40:45.3 |
HIP 2736 |
18.35 |
| 2026-02-17 00:00 |
00:35:18.93 |
+04:45:05.6 |
HIP 2736 |
22.82 |
| 2026-02-17 12:00 |
00:35:57.66 |
+04:49:26.5 |
HIP 2736 |
30.48 |
| 2026-02-18 00:00 |
00:36:36.50 |
+04:53:47.9 |
HIP 2918 |
31.37 |
| 2026-02-18 12:00 |
00:37:15.45 |
+04:58:09.9 |
HIP 2918 |
26.98 |
| 2026-02-19 00:00 |
00:37:54.52 |
+05:02:32.4 |
HIP 2918 |
26.42 |
| 2026-02-19 12:00 |
00:38:33.69 |
+05:06:55.4 |
HIP 2918 |
29.94 |
| 2026-02-20 00:00 |
00:39:12.97 |
+05:11:19.0 |
HIP 2918 |
36.40 |
| 2026-02-20 12:00 |
00:39:52.36 |
+05:15:43.1 |
HIP 3270 |
32.73 |
| 2026-02-21 00:00 |
00:40:31.86 |
+05:20:07.6 |
HIP 3270 |
22.23 |
| 2026-02-21 12:00 |
00:41:11.47 |
+05:24:32.7 |
HIP 3270 |
12.21 |
| 2026-02-22 00:00 |
00:41:51.18 |
+05:28:58.3 |
HIP 3270 |
6.08 |
| 2026-02-22 12:00 |
00:42:30.99 |
+05:33:24.3 |
HIP 3338 |
7.13 |
| 2026-02-23 00:00 |
00:43:10.91 |
+05:37:50.8 |
HIP 3338 |
9.85 |
| 2026-02-23 12:00 |
00:43:50.94 |
+05:42:17.7 |
HIP 3460 |
12.94 |
| 2026-02-24 00:00 |
00:44:31.07 |
+05:46:45.1 |
HIP 3460 |
7.73 |