495P/Christensen
| Parameter |
Value |
| Designation |
495P/Christensen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-10-25T04:42:36.552960Z |
| Orbit solution date (soln_date, UTC) |
2026-01-07T15:43:11Z |
| Obs used |
112 |
| NEO |
- |
| M1 |
15.100 |
| K1 |
5.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-09-08T07:05:23.683200Z |
| Discovery magnitude (MPC) |
21.04 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2021-02-20.0000000 |
| e |
0.27113500 |
| q (au) |
3.462716 |
| a (au) |
4.750833 |
| i (deg) |
26.355392 |
| Ω (om, deg) |
291.623627 |
| ω (w, deg) |
141.476723 |
| M (ma, deg) |
197.412478 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.409 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.409 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.667 |
| k |
0.800 |
| 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) |
| 2026-02-03 00:00 |
05:09:10.50 |
+34:12:01.3 |
HIP 23797 |
35.75 |
| 2026-02-03 12:00 |
05:09:10.04 |
+34:07:57.3 |
HIP 24226 |
37.50 |
| 2026-02-04 00:00 |
05:09:09.93 |
+34:03:54.2 |
HIP 24226 |
36.64 |
| 2026-02-04 12:00 |
05:09:10.18 |
+33:59:51.9 |
HIP 24226 |
36.15 |
| 2026-02-05 00:00 |
05:09:10.78 |
+33:55:50.5 |
HIP 24226 |
36.03 |
| 2026-02-05 12:00 |
05:09:11.74 |
+33:51:50.0 |
HIP 24226 |
36.29 |
| 2026-02-06 00:00 |
05:09:13.05 |
+33:47:50.4 |
HIP 23971 |
32.75 |
| 2026-02-06 12:00 |
05:09:14.72 |
+33:43:51.7 |
HIP 23971 |
28.79 |
| 2026-02-07 00:00 |
05:09:16.74 |
+33:39:54.0 |
HIP 23971 |
24.86 |
| 2026-02-07 12:00 |
05:09:19.10 |
+33:35:57.2 |
HIP 23971 |
20.97 |
| 2026-02-08 00:00 |
05:09:21.82 |
+33:32:01.3 |
HIP 23971 |
17.15 |
| 2026-02-08 12:00 |
05:09:24.88 |
+33:28:06.4 |
HIP 23971 |
13.45 |
| 2026-02-09 00:00 |
05:09:28.29 |
+33:24:12.4 |
HIP 23971 |
10.00 |
| 2026-02-09 12:00 |
05:09:32.05 |
+33:20:19.5 |
HIP 23971 |
7.18 |
| 2026-02-10 00:00 |
05:09:36.15 |
+33:16:27.5 |
HIP 23971 |
5.94 |
| 2026-02-10 12:00 |
05:09:40.59 |
+33:12:36.5 |
HIP 23971 |
7.16 |
| 2026-02-11 00:00 |
05:09:45.37 |
+33:08:46.6 |
HIP 23971 |
9.97 |
| 2026-02-11 12:00 |
05:09:50.49 |
+33:04:57.6 |
HIP 23971 |
13.42 |
| 2026-02-12 00:00 |
05:09:55.95 |
+33:01:09.7 |
HIP 23971 |
17.12 |
| 2026-02-12 12:00 |
05:10:01.74 |
+32:57:22.7 |
HIP 23971 |
20.94 |
| 2026-02-13 00:00 |
05:10:07.87 |
+32:53:36.9 |
HIP 23971 |
24.83 |
| 2026-02-13 12:00 |
05:10:14.33 |
+32:49:52.0 |
HIP 24232 |
24.51 |
| 2026-02-14 00:00 |
05:10:21.13 |
+32:46:08.2 |
HIP 24232 |
24.01 |
| 2026-02-14 12:00 |
05:10:28.26 |
+32:42:25.5 |
HIP 24232 |
24.10 |
| 2026-02-15 00:00 |
05:10:35.71 |
+32:38:43.8 |
HIP 24232 |
24.78 |
| 2026-02-15 12:00 |
05:10:43.49 |
+32:35:03.1 |
HIP 24232 |
26.00 |
| 2026-02-16 00:00 |
05:10:51.60 |
+32:31:23.6 |
HIP 24232 |
27.70 |
| 2026-02-16 12:00 |
05:11:00.03 |
+32:27:45.1 |
HIP 24133 |
25.43 |
| 2026-02-17 00:00 |
05:11:08.78 |
+32:24:07.6 |
HIP 24133 |
21.90 |
| 2026-02-17 12:00 |
05:11:17.85 |
+32:20:31.2 |
HIP 24133 |
18.62 |
| 2026-02-18 00:00 |
05:11:27.24 |
+32:16:55.9 |
HIP 24133 |
15.77 |
| 2026-02-18 12:00 |
05:11:36.95 |
+32:13:21.7 |
HIP 24133 |
13.63 |
| 2026-02-19 00:00 |
05:11:46.97 |
+32:09:48.6 |
HIP 24133 |
12.59 |
| 2026-02-19 12:00 |
05:11:57.31 |
+32:06:16.5 |
HIP 24133 |
12.93 |
| 2026-02-20 00:00 |
05:12:07.95 |
+32:02:45.5 |
HIP 24133 |
14.58 |
| 2026-02-20 12:00 |
05:12:18.91 |
+31:59:15.5 |
HIP 24133 |
17.17 |
| 2026-02-21 00:00 |
05:12:30.17 |
+31:55:46.7 |
HIP 24133 |
20.37 |
| 2026-02-21 12:00 |
05:12:41.74 |
+31:52:18.9 |
HIP 24133 |
23.94 |
| 2026-02-22 00:00 |
05:12:53.60 |
+31:48:52.2 |
HIP 24388 |
19.79 |
| 2026-02-22 12:00 |
05:13:05.77 |
+31:45:26.6 |
HIP 24388 |
15.52 |
| 2026-02-23 00:00 |
05:13:18.24 |
+31:42:02.0 |
HIP 24388 |
11.24 |
| 2026-02-23 12:00 |
05:13:31.00 |
+31:38:38.5 |
HIP 24388 |
6.96 |
| 2026-02-24 00:00 |
05:13:44.06 |
+31:35:16.0 |
HIP 24388 |
2.83 |