| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
06:10:33.57 |
+26:06:13.1 |
HIP 29390 |
25.63 |
| 2026-09-20 12:00 |
06:11:07.62 |
+26:07:17.5 |
HIP 29390 |
21.28 |
| 2026-09-21 00:00 |
06:11:41.50 |
+26:08:21.9 |
HIP 29390 |
19.17 |
| 2026-09-21 12:00 |
06:12:15.21 |
+26:09:26.3 |
HIP 29390 |
19.98 |
| 2026-09-22 00:00 |
06:12:48.76 |
+26:10:30.7 |
HIP 29390 |
23.37 |
| 2026-09-22 12:00 |
06:13:22.13 |
+26:11:35.2 |
HIP 29390 |
28.39 |
| 2026-09-23 00:00 |
06:13:55.33 |
+26:12:39.7 |
HIP 29390 |
34.32 |
| 2026-09-23 12:00 |
06:14:28.36 |
+26:13:44.4 |
HIP 29826 |
35.71 |
| 2026-09-24 00:00 |
06:15:01.21 |
+26:14:49.0 |
HIP 29826 |
28.73 |
| 2026-09-24 12:00 |
06:15:33.88 |
+26:15:53.8 |
HIP 29826 |
22.08 |
| 2026-09-25 00:00 |
06:16:06.37 |
+26:16:58.7 |
HIP 29826 |
16.13 |
| 2026-09-25 12:00 |
06:16:38.68 |
+26:18:03.7 |
HIP 29826 |
11.88 |
| 2026-09-26 00:00 |
06:17:10.80 |
+26:19:08.8 |
HIP 29826 |
11.34 |
| 2026-09-26 12:00 |
06:17:42.74 |
+26:20:14.0 |
HIP 29826 |
14.87 |
| 2026-09-27 00:00 |
06:18:14.49 |
+26:21:19.4 |
HIP 29826 |
20.41 |
| 2026-09-27 12:00 |
06:18:46.05 |
+26:22:24.9 |
HIP 30035 |
24.27 |
| 2026-09-28 00:00 |
06:19:17.42 |
+26:23:30.6 |
HIP 30035 |
24.59 |
| 2026-09-28 12:00 |
06:19:48.59 |
+26:24:36.5 |
HIP 30035 |
26.85 |
| 2026-09-29 00:00 |
06:20:19.57 |
+26:25:42.5 |
HIP 30035 |
30.60 |
| 2026-09-29 12:00 |
06:20:50.34 |
+26:26:48.8 |
HIP 30306 |
25.19 |
| 2026-09-30 00:00 |
06:21:20.92 |
+26:27:55.2 |
HIP 30306 |
18.99 |
| 2026-09-30 12:00 |
06:21:51.29 |
+26:29:01.9 |
HIP 30306 |
13.54 |
| 2026-10-01 00:00 |
06:22:21.46 |
+26:30:08.8 |
HIP 30306 |
10.04 |
| 2026-10-01 12:00 |
06:22:51.42 |
+26:31:15.9 |
HIP 30306 |
10.54 |
| 2026-10-02 00:00 |
06:23:21.16 |
+26:32:23.3 |
HIP 30306 |
14.57 |
| 2026-10-02 12:00 |
06:23:50.70 |
+26:33:30.9 |
HIP 30306 |
20.07 |
| 2026-10-03 00:00 |
06:24:20.02 |
+26:34:38.8 |
HIP 30306 |
26.08 |
| 2026-10-03 12:00 |
06:24:49.12 |
+26:35:47.0 |
HIP 30306 |
32.29 |
| 2026-10-04 00:00 |
06:25:17.99 |
+26:36:55.6 |
HIP 30724 |
27.07 |
| 2026-10-04 12:00 |
06:25:46.65 |
+26:38:04.4 |
HIP 30724 |
20.58 |
| 2026-10-05 00:00 |
06:26:15.07 |
+26:39:13.5 |
HIP 30724 |
14.15 |
| 2026-10-05 12:00 |
06:26:43.27 |
+26:40:23.0 |
HIP 30724 |
7.82 |
| 2026-10-06 00:00 |
06:27:11.24 |
+26:41:32.8 |
HIP 30724 |
2.10 |
| 2026-10-06 12:00 |
06:27:38.97 |
+26:42:43.0 |
HIP 30724 |
5.29 |
| 2026-10-07 00:00 |
06:28:06.46 |
+26:43:53.6 |
HIP 30724 |
11.39 |
| 2026-10-07 12:00 |
06:28:33.72 |
+26:45:04.5 |
HIP 30880 |
13.93 |
| 2026-10-08 00:00 |
06:29:00.73 |
+26:46:15.9 |
HIP 30880 |
11.84 |
| 2026-10-08 12:00 |
06:29:27.50 |
+26:47:27.6 |
HIP 30880 |
12.67 |
| 2026-10-09 00:00 |
06:29:54.02 |
+26:48:39.8 |
HIP 30984 |
9.01 |
| 2026-10-09 12:00 |
06:30:20.29 |
+26:49:52.4 |
HIP 30984 |
7.50 |
| 2026-10-10 00:00 |
06:30:46.31 |
+26:51:05.4 |
HIP 30984 |
10.09 |
| 2026-10-10 12:00 |
06:31:12.07 |
+26:52:18.9 |
HIP 30984 |
14.69 |
| 2026-10-11 00:00 |
06:31:37.57 |
+26:53:32.9 |
HIP 31213 |
18.28 |