| Parameter |
Value |
| Designation |
164P/Christensen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-05-31T09:40:42.960000Z |
| Orbit solution date (soln_date, UTC) |
2026-05-29T11:29:02Z |
| Obs used |
1832 |
| NEO |
- |
| M1 |
14.300 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-07-22.0000000 |
| e |
0.53972539 |
| q (au) |
1.685243 |
| a (au) |
3.661387 |
| i (deg) |
16.252900 |
| Ω (om, deg) |
88.305833 |
| ω (w, deg) |
325.928159 |
| M (ma, deg) |
7.258682 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.741 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.741 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.689 |
| k |
0.988 |
| 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) |
| 2026-06-01 00:00 |
10:44:14.70 |
+25:35:50.3 |
HIP 52456 |
15.17 |
| 2026-06-01 12:00 |
10:44:34.87 |
+25:31:53.2 |
HIP 52456 |
21.19 |
| 2026-06-02 00:00 |
10:44:55.20 |
+25:27:55.7 |
HIP 52681 |
20.68 |
| 2026-06-02 12:00 |
10:45:15.69 |
+25:23:57.9 |
HIP 52681 |
19.03 |
| 2026-06-03 00:00 |
10:45:36.32 |
+25:19:59.7 |
HIP 52681 |
19.25 |
| 2026-06-03 12:00 |
10:45:57.11 |
+25:16:01.2 |
HIP 52681 |
21.29 |
| 2026-06-04 00:00 |
10:46:18.05 |
+25:12:02.4 |
HIP 52593 |
24.43 |
| 2026-06-04 12:00 |
10:46:39.13 |
+25:08:03.2 |
HIP 52593 |
24.82 |
| 2026-06-05 00:00 |
10:47:00.37 |
+25:04:03.7 |
HIP 52593 |
26.72 |
| 2026-06-05 12:00 |
10:47:21.74 |
+25:00:03.8 |
HIP 52695 |
28.31 |
| 2026-06-06 00:00 |
10:47:43.26 |
+24:56:03.7 |
HIP 52695 |
27.53 |
| 2026-06-06 12:00 |
10:48:04.93 |
+24:52:03.2 |
HIP 52695 |
28.21 |
| 2026-06-07 00:00 |
10:48:26.73 |
+24:48:02.5 |
HIP 52695 |
30.27 |
| 2026-06-07 12:00 |
10:48:48.67 |
+24:44:01.4 |
HIP 52695 |
33.47 |
| 2026-06-08 00:00 |
10:49:10.76 |
+24:40:00.1 |
HIP 53034 |
28.94 |
| 2026-06-08 12:00 |
10:49:32.97 |
+24:35:58.4 |
HIP 53034 |
22.66 |
| 2026-06-09 00:00 |
10:49:55.33 |
+24:31:56.5 |
HIP 53034 |
16.50 |
| 2026-06-09 12:00 |
10:50:17.81 |
+24:27:54.3 |
HIP 53034 |
10.68 |
| 2026-06-10 00:00 |
10:50:40.43 |
+24:23:51.9 |
HIP 53034 |
6.38 |
| 2026-06-10 12:00 |
10:51:03.18 |
+24:19:49.1 |
HIP 53034 |
7.27 |
| 2026-06-11 00:00 |
10:51:26.06 |
+24:15:46.2 |
HIP 53034 |
12.32 |
| 2026-06-11 12:00 |
10:51:49.07 |
+24:11:42.9 |
HIP 53034 |
18.40 |
| 2026-06-12 00:00 |
10:52:12.21 |
+24:07:39.4 |
HIP 53034 |
24.79 |
| 2026-06-12 12:00 |
10:52:35.47 |
+24:03:35.7 |
HIP 53317 |
23.87 |
| 2026-06-13 00:00 |
10:52:58.86 |
+23:59:31.7 |
HIP 53317 |
18.05 |
| 2026-06-13 12:00 |
10:53:22.37 |
+23:55:27.5 |
HIP 53317 |
13.08 |
| 2026-06-14 00:00 |
10:53:46.00 |
+23:51:23.0 |
HIP 53317 |
10.33 |
| 2026-06-14 12:00 |
10:54:09.76 |
+23:47:18.4 |
HIP 53370 |
9.36 |
| 2026-06-15 00:00 |
10:54:33.63 |
+23:43:13.5 |
HIP 53370 |
4.25 |
| 2026-06-15 12:00 |
10:54:57.62 |
+23:39:08.4 |
HIP 53370 |
6.46 |
| 2026-06-16 00:00 |
10:55:21.73 |
+23:35:03.1 |
HIP 53370 |
12.63 |
| 2026-06-16 12:00 |
10:55:45.96 |
+23:30:57.6 |
HIP 53476 |
17.88 |
| 2026-06-17 00:00 |
10:56:10.29 |
+23:26:52.0 |
HIP 53476 |
12.10 |
| 2026-06-17 12:00 |
10:56:34.74 |
+23:22:46.1 |
HIP 53476 |
8.30 |
| 2026-06-18 00:00 |
10:56:59.30 |
+23:18:40.1 |
HIP 53476 |
9.41 |
| 2026-06-18 12:00 |
10:57:23.97 |
+23:14:33.9 |
HIP 53476 |
14.36 |
| 2026-06-19 00:00 |
10:57:48.75 |
+23:10:27.5 |
HIP 53476 |
20.57 |
| 2026-06-19 12:00 |
10:58:13.64 |
+23:06:21.0 |
HIP 53752 |
24.08 |
| 2026-06-20 00:00 |
10:58:38.63 |
+23:02:14.4 |
HIP 53752 |
17.25 |
| 2026-06-20 12:00 |
10:59:03.72 |
+22:58:07.6 |
HIP 53752 |
10.68 |
| 2026-06-21 00:00 |
10:59:28.92 |
+22:54:00.6 |
HIP 53752 |
5.57 |
| 2026-06-21 12:00 |
10:59:54.22 |
+22:49:53.6 |
HIP 53767 |
2.38 |
| 2026-06-22 00:00 |
11:00:19.61 |
+22:45:46.4 |
HIP 53767 |
5.49 |