298P/Christensen
| Parameter |
Value |
| Designation |
298P/Christensen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2007-03-05T06:56:45.335040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:17Z |
| Obs used |
145 |
| NEO |
- |
| M1 |
16.100 |
| K1 |
8.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2007-08-29.0000000 |
| e |
0.41245123 |
| q (au) |
2.050749 |
| a (au) |
3.490347 |
| i (deg) |
8.021637 |
| Ω (om, deg) |
57.117855 |
| ω (w, deg) |
95.623968 |
| M (ma, deg) |
26.709372 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.973 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.973 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
01:22:59.23 |
+06:23:52.1 |
HIP 6521 |
13.30 |
| 2026-02-03 12:00 |
01:23:19.89 |
+06:26:40.3 |
HIP 6521 |
7.46 |
| 2026-02-04 00:00 |
01:23:40.72 |
+06:29:29.3 |
HIP 6521 |
1.59 |
| 2026-02-04 12:00 |
01:24:01.72 |
+06:32:19.0 |
HIP 6521 |
4.39 |
| 2026-02-05 00:00 |
01:24:22.88 |
+06:35:09.5 |
HIP 6572 |
6.13 |
| 2026-02-05 12:00 |
01:24:44.22 |
+06:38:00.7 |
HIP 6572 |
10.11 |
| 2026-02-06 00:00 |
01:25:05.72 |
+06:40:52.7 |
HIP 6572 |
15.51 |
| 2026-02-06 12:00 |
01:25:27.38 |
+06:43:45.4 |
HIP 6572 |
21.30 |
| 2026-02-07 00:00 |
01:25:49.21 |
+06:46:38.7 |
HIP 6788 |
25.50 |
| 2026-02-07 12:00 |
01:26:11.21 |
+06:49:32.8 |
HIP 6788 |
19.32 |
| 2026-02-08 00:00 |
01:26:33.36 |
+06:52:27.6 |
HIP 6788 |
13.11 |
| 2026-02-08 12:00 |
01:26:55.68 |
+06:55:23.1 |
HIP 6788 |
6.88 |
| 2026-02-09 00:00 |
01:27:18.16 |
+06:58:19.2 |
HIP 6788 |
1.05 |
| 2026-02-09 12:00 |
01:27:40.79 |
+07:01:16.1 |
HIP 6788 |
5.90 |
| 2026-02-10 00:00 |
01:28:03.59 |
+07:04:13.6 |
HIP 6788 |
12.25 |
| 2026-02-10 12:00 |
01:28:26.55 |
+07:07:11.8 |
HIP 6915 |
13.84 |
| 2026-02-11 00:00 |
01:28:49.66 |
+07:10:10.6 |
HIP 6915 |
8.19 |
| 2026-02-11 12:00 |
01:29:12.93 |
+07:13:10.1 |
HIP 6915 |
5.10 |
| 2026-02-12 00:00 |
01:29:36.35 |
+07:16:10.2 |
HIP 6915 |
8.38 |
| 2026-02-12 12:00 |
01:29:59.93 |
+07:19:11.0 |
HIP 6915 |
14.17 |
| 2026-02-13 00:00 |
01:30:23.67 |
+07:22:12.4 |
HIP 6915 |
20.49 |
| 2026-02-13 12:00 |
01:30:47.55 |
+07:25:14.4 |
HIP 7071 |
17.33 |
| 2026-02-14 00:00 |
01:31:11.59 |
+07:28:17.0 |
HIP 7071 |
13.48 |
| 2026-02-14 12:00 |
01:31:35.78 |
+07:31:20.2 |
HIP 7071 |
12.37 |
| 2026-02-15 00:00 |
01:32:00.12 |
+07:34:24.0 |
HIP 7071 |
14.68 |
| 2026-02-15 12:00 |
01:32:24.61 |
+07:37:28.4 |
HIP 7071 |
19.26 |
| 2026-02-16 00:00 |
01:32:49.25 |
+07:40:33.4 |
HIP 7071 |
24.91 |
| 2026-02-16 12:00 |
01:33:14.03 |
+07:43:39.0 |
HIP 7243 |
28.90 |
| 2026-02-17 00:00 |
01:33:38.96 |
+07:46:45.1 |
HIP 7243 |
26.28 |
| 2026-02-17 12:00 |
01:34:04.04 |
+07:49:51.8 |
HIP 7243 |
25.34 |
| 2026-02-18 00:00 |
01:34:29.26 |
+07:52:59.0 |
HIP 7366 |
24.21 |
| 2026-02-18 12:00 |
01:34:54.63 |
+07:56:06.8 |
HIP 7366 |
20.39 |
| 2026-02-19 00:00 |
01:35:20.14 |
+07:59:15.1 |
HIP 7366 |
18.54 |
| 2026-02-19 12:00 |
01:35:45.79 |
+08:02:23.9 |
HIP 7505 |
19.00 |
| 2026-02-20 00:00 |
01:36:11.58 |
+08:05:33.3 |
HIP 7505 |
17.55 |
| 2026-02-20 12:00 |
01:36:37.51 |
+08:08:43.1 |
HIP 7505 |
18.89 |
| 2026-02-21 00:00 |
01:37:03.58 |
+08:11:53.5 |
HIP 7505 |
22.55 |
| 2026-02-21 12:00 |
01:37:29.79 |
+08:15:04.3 |
HIP 7686 |
23.03 |
| 2026-02-22 00:00 |
01:37:56.13 |
+08:18:15.7 |
HIP 7686 |
18.75 |
| 2026-02-22 12:00 |
01:38:22.61 |
+08:21:27.5 |
HIP 7686 |
16.66 |
| 2026-02-23 00:00 |
01:38:49.23 |
+08:24:39.7 |
HIP 7686 |
17.61 |
| 2026-02-23 12:00 |
01:39:15.97 |
+08:27:52.5 |
HIP 7686 |
21.23 |
| 2026-02-24 00:00 |
01:39:42.86 |
+08:31:05.6 |
HIP 7819 |
19.42 |