| Parameter |
Value |
| Designation |
495P/Christensen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-10-24T23:13:34.135680Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T11:43:25Z |
| Obs used |
115 |
| NEO |
- |
| M1 |
13.200 |
| K1 |
8.250 |
| PC |
0.030 |
| 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) |
2021-04-09.0000000 |
| e |
0.27110379 |
| q (au) |
3.463051 |
| a (au) |
4.751089 |
| i (deg) |
26.355014 |
| Ω (om, deg) |
291.624044 |
| ω (w, deg) |
141.455398 |
| M (ma, deg) |
202.015672 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.943 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.943 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.724 |
| 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) |
| 2026-05-12 00:00 |
06:26:14.10 |
+25:03:47.3 |
HIP 30682 |
10.21 |
| 2026-05-12 12:00 |
06:26:51.35 |
+25:01:28.0 |
HIP 30682 |
3.22 |
| 2026-05-13 00:00 |
06:27:28.64 |
+24:59:08.5 |
HIP 30682 |
8.36 |
| 2026-05-13 12:00 |
06:28:06.00 |
+24:56:48.7 |
HIP 30799 |
16.12 |
| 2026-05-14 00:00 |
06:28:43.40 |
+24:54:28.6 |
HIP 30799 |
14.84 |
| 2026-05-14 12:00 |
06:29:20.86 |
+24:52:08.3 |
HIP 30799 |
18.32 |
| 2026-05-15 00:00 |
06:29:58.36 |
+24:49:47.8 |
HIP 30799 |
24.64 |
| 2026-05-15 12:00 |
06:30:35.92 |
+24:47:26.9 |
HIP 31114 |
19.23 |
| 2026-05-16 00:00 |
06:31:13.53 |
+24:45:05.8 |
HIP 31114 |
15.46 |
| 2026-05-16 12:00 |
06:31:51.18 |
+24:42:44.4 |
HIP 31114 |
16.27 |
| 2026-05-17 00:00 |
06:32:28.88 |
+24:40:22.8 |
HIP 31114 |
21.17 |
| 2026-05-17 12:00 |
06:33:06.63 |
+24:38:00.8 |
HIP 31114 |
28.10 |
| 2026-05-18 00:00 |
06:33:44.42 |
+24:35:38.5 |
HIP 31412 |
26.27 |
| 2026-05-18 12:00 |
06:34:22.25 |
+24:33:16.0 |
HIP 31412 |
23.72 |
| 2026-05-19 00:00 |
06:35:00.13 |
+24:30:53.1 |
HIP 31388 |
22.15 |
| 2026-05-19 12:00 |
06:35:38.05 |
+24:28:30.0 |
HIP 31631 |
20.91 |
| 2026-05-20 00:00 |
06:36:16.00 |
+24:26:06.5 |
HIP 31631 |
11.97 |
| 2026-05-20 12:00 |
06:36:54.00 |
+24:23:42.7 |
HIP 31631 |
3.13 |
| 2026-05-21 00:00 |
06:37:32.04 |
+24:21:18.6 |
HIP 31631 |
6.13 |
| 2026-05-21 12:00 |
06:38:10.11 |
+24:18:54.2 |
HIP 31730 |
8.37 |
| 2026-05-22 00:00 |
06:38:48.22 |
+24:16:29.4 |
HIP 31730 |
12.48 |
| 2026-05-22 12:00 |
06:39:26.37 |
+24:14:04.3 |
HIP 31730 |
20.10 |
| 2026-05-23 00:00 |
06:40:04.55 |
+24:11:38.9 |
HIP 32004 |
16.88 |
| 2026-05-23 12:00 |
06:40:42.76 |
+24:09:13.1 |
HIP 32004 |
8.00 |
| 2026-05-24 00:00 |
06:41:21.01 |
+24:06:47.0 |
HIP 32004 |
2.57 |
| 2026-05-24 12:00 |
06:41:59.29 |
+24:04:20.5 |
HIP 32004 |
10.66 |
| 2026-05-25 00:00 |
06:42:37.60 |
+24:01:53.6 |
HIP 32167 |
8.17 |
| 2026-05-25 12:00 |
06:43:15.94 |
+23:59:26.5 |
HIP 32167 |
9.42 |
| 2026-05-26 00:00 |
06:43:54.30 |
+23:56:58.9 |
HIP 32266 |
5.66 |
| 2026-05-26 12:00 |
06:44:32.70 |
+23:54:31.0 |
HIP 32266 |
4.82 |
| 2026-05-27 00:00 |
06:45:11.13 |
+23:52:02.7 |
HIP 32266 |
13.45 |
| 2026-05-27 12:00 |
06:45:49.58 |
+23:49:34.1 |
HIP 32367 |
12.36 |
| 2026-05-28 00:00 |
06:46:28.05 |
+23:47:05.0 |
HIP 32491 |
8.15 |
| 2026-05-28 12:00 |
06:47:06.56 |
+23:44:35.6 |
HIP 32491 |
5.21 |
| 2026-05-29 00:00 |
06:47:45.09 |
+23:42:05.8 |
HIP 32491 |
12.48 |
| 2026-05-29 12:00 |
06:48:23.64 |
+23:39:35.6 |
HIP 32678 |
9.38 |
| 2026-05-30 00:00 |
06:49:02.21 |
+23:37:05.1 |
HIP 32678 |
7.51 |
| 2026-05-30 12:00 |
06:49:40.81 |
+23:34:34.1 |
HIP 32678 |
13.92 |
| 2026-05-31 00:00 |
06:50:19.43 |
+23:32:02.7 |
HIP 32906 |
17.59 |
| 2026-05-31 12:00 |
06:50:58.07 |
+23:29:31.0 |
HIP 32906 |
9.43 |
| 2026-06-01 00:00 |
06:51:36.73 |
+23:26:58.8 |
HIP 32906 |
6.17 |
| 2026-06-01 12:00 |
06:52:15.42 |
+23:24:26.2 |
HIP 32968 |
12.19 |
| 2026-06-02 00:00 |
06:52:54.12 |
+23:21:53.2 |
HIP 32968 |
18.87 |