| 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 · University of Arizona 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
$$
M_a = (17.873 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.873 |
| n |
2.000 |
| gf |
0.997 |
| gb |
-0.721 |
| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
06:53:32.84 |
+23:19:19.8 |
HIP 32968 |
27.10 |
| 2026-06-03 00:00 |
06:54:11.58 |
+23:16:46.0 |
HIP 33097 |
31.25 |
| 2026-06-03 12:00 |
06:54:50.33 |
+23:14:11.7 |
HIP 33097 |
32.42 |
| 2026-06-04 00:00 |
06:55:29.10 |
+23:11:37.0 |
HIP 33097 |
36.03 |
| 2026-06-04 12:00 |
06:56:07.89 |
+23:09:01.9 |
HIP 33497 |
27.44 |
| 2026-06-05 00:00 |
06:56:46.70 |
+23:06:26.4 |
HIP 33497 |
18.83 |
| 2026-06-05 12:00 |
06:57:25.52 |
+23:03:50.4 |
HIP 33497 |
11.34 |
| 2026-06-06 00:00 |
06:58:04.35 |
+23:01:14.0 |
HIP 33497 |
8.70 |
| 2026-06-06 12:00 |
06:58:43.20 |
+22:58:37.2 |
HIP 33497 |
14.01 |
| 2026-06-07 00:00 |
06:59:22.07 |
+22:55:59.9 |
HIP 33497 |
22.16 |
| 2026-06-07 12:00 |
07:00:00.94 |
+22:53:22.1 |
HIP 33497 |
30.98 |
| 2026-06-08 00:00 |
07:00:39.83 |
+22:50:43.9 |
HIP 33757 |
35.68 |
| 2026-06-08 12:00 |
07:01:18.73 |
+22:48:05.3 |
HIP 33999 |
35.18 |
| 2026-06-09 00:00 |
07:01:57.64 |
+22:45:26.2 |
HIP 33999 |
26.87 |
| 2026-06-09 12:00 |
07:02:36.56 |
+22:42:46.6 |
HIP 33999 |
19.53 |
| 2026-06-10 00:00 |
07:03:15.49 |
+22:40:06.6 |
HIP 33999 |
14.70 |
| 2026-06-10 12:00 |
07:03:54.43 |
+22:37:26.1 |
HIP 33999 |
15.06 |
| 2026-06-11 00:00 |
07:04:33.38 |
+22:34:45.1 |
HIP 34182 |
10.96 |
| 2026-06-11 12:00 |
07:05:12.33 |
+22:32:03.7 |
HIP 34182 |
6.34 |
| 2026-06-12 00:00 |
07:05:51.30 |
+22:29:21.8 |
HIP 34182 |
11.69 |
| 2026-06-12 12:00 |
07:06:30.27 |
+22:26:39.4 |
HIP 34271 |
14.69 |
| 2026-06-13 00:00 |
07:07:09.24 |
+22:23:56.6 |
HIP 34356 |
18.48 |
| 2026-06-13 12:00 |
07:07:48.22 |
+22:21:13.3 |
HIP 34356 |
21.89 |
| 2026-06-14 00:00 |
07:08:27.21 |
+22:18:29.4 |
HIP 34583 |
18.17 |
| 2026-06-14 12:00 |
07:09:06.20 |
+22:15:45.2 |
HIP 34583 |
10.75 |
| 2026-06-15 00:00 |
07:09:45.19 |
+22:13:00.4 |
HIP 34583 |
8.87 |
| 2026-06-15 12:00 |
07:10:24.18 |
+22:10:15.1 |
HIP 34583 |
14.83 |
| 2026-06-16 00:00 |
07:11:03.17 |
+22:07:29.4 |
HIP 34779 |
16.28 |
| 2026-06-16 12:00 |
07:11:42.16 |
+22:04:43.1 |
HIP 34779 |
12.80 |
| 2026-06-17 00:00 |
07:12:21.16 |
+22:01:56.4 |
HIP 34779 |
15.52 |
| 2026-06-17 12:00 |
07:13:00.15 |
+21:59:09.2 |
HIP 34779 |
22.29 |
| 2026-06-18 00:00 |
07:13:39.14 |
+21:56:21.5 |
HIP 35106 |
26.61 |
| 2026-06-18 12:00 |
07:14:18.12 |
+21:53:33.3 |
HIP 35106 |
18.08 |
| 2026-06-19 00:00 |
07:14:57.11 |
+21:50:44.5 |
HIP 35106 |
11.16 |
| 2026-06-19 12:00 |
07:15:36.08 |
+21:47:55.4 |
HIP 35106 |
10.09 |
| 2026-06-20 00:00 |
07:16:15.06 |
+21:45:05.7 |
HIP 35106 |
16.08 |
| 2026-06-20 12:00 |
07:16:54.02 |
+21:42:15.5 |
HIP 35106 |
24.40 |
| 2026-06-21 00:00 |
07:17:32.98 |
+21:39:24.8 |
HIP 35106 |
33.35 |
| 2026-06-21 12:00 |
07:18:11.93 |
+21:36:33.6 |
HIP 35481 |
29.99 |
| 2026-06-22 00:00 |
07:18:50.88 |
+21:33:41.9 |
HIP 35481 |
28.81 |