| Parameter |
Value |
| Designation |
308P/Lagerkvist-Carsenty |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-05-13T16:53:46.351680Z |
| Orbit solution date (soln_date, UTC) |
2024-10-10T19:55:49Z |
| Obs used |
369 |
| NEO |
- |
| M1 |
10.700 |
| K1 |
10.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2014-08-16T04:49:51.110400Z |
| Discovery magnitude (MPC) |
20.70 i |
| Discovery observatory (MPC) |
W84 · Cerro Tololo-DECam |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2007-05-13.0000000 |
| e |
0.36222272 |
| q (au) |
4.256979 |
| a (au) |
6.674710 |
| i (deg) |
4.840175 |
| Ω (om, deg) |
63.143956 |
| ω (w, deg) |
333.650183 |
| M (ma, deg) |
192.952390 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.986 + 3.995\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.986 |
| n |
3.995 |
| gf |
1.000 |
| gb |
-0.962 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
16:30:05.94 |
-21:50:33.2 |
HIP 80841 |
8.43 |
| 2026-03-26 12:00 |
16:30:03.69 |
-21:50:33.8 |
HIP 80841 |
8.81 |
| 2026-03-27 00:00 |
16:30:01.32 |
-21:50:34.1 |
HIP 80841 |
9.22 |
| 2026-03-27 12:00 |
16:29:58.83 |
-21:50:34.1 |
HIP 80841 |
9.66 |
| 2026-03-28 00:00 |
16:29:56.21 |
-21:50:33.9 |
HIP 80841 |
10.14 |
| 2026-03-28 12:00 |
16:29:53.47 |
-21:50:33.5 |
HIP 80841 |
10.66 |
| 2026-03-29 00:00 |
16:29:50.60 |
-21:50:32.8 |
HIP 80841 |
11.20 |
| 2026-03-29 12:00 |
16:29:47.60 |
-21:50:31.8 |
HIP 80841 |
11.79 |
| 2026-03-30 00:00 |
16:29:44.49 |
-21:50:30.6 |
HIP 80841 |
12.41 |
| 2026-03-30 12:00 |
16:29:41.25 |
-21:50:29.1 |
HIP 80841 |
13.06 |
| 2026-03-31 00:00 |
16:29:37.88 |
-21:50:27.3 |
HIP 80841 |
13.75 |
| 2026-03-31 12:00 |
16:29:34.39 |
-21:50:25.3 |
HIP 80841 |
14.47 |
| 2026-04-01 00:00 |
16:29:30.78 |
-21:50:23.0 |
HIP 80841 |
15.22 |
| 2026-04-01 12:00 |
16:29:27.05 |
-21:50:20.5 |
HIP 80841 |
16.01 |
| 2026-04-02 00:00 |
16:29:23.19 |
-21:50:17.7 |
HIP 80756 |
16.18 |
| 2026-04-02 12:00 |
16:29:19.22 |
-21:50:14.7 |
HIP 80756 |
16.11 |
| 2026-04-03 00:00 |
16:29:15.12 |
-21:50:11.4 |
HIP 80756 |
16.09 |
| 2026-04-03 12:00 |
16:29:10.90 |
-21:50:07.8 |
HIP 80756 |
16.12 |
| 2026-04-04 00:00 |
16:29:06.56 |
-21:50:04.0 |
HIP 80756 |
16.22 |
| 2026-04-04 12:00 |
16:29:02.09 |
-21:49:59.9 |
HIP 80756 |
16.38 |
| 2026-04-05 00:00 |
16:28:57.51 |
-21:49:55.5 |
HIP 80756 |
16.61 |
| 2026-04-05 12:00 |
16:28:52.81 |
-21:49:50.9 |
HIP 80756 |
16.91 |
| 2026-04-06 00:00 |
16:28:47.99 |
-21:49:46.1 |
HIP 80756 |
17.28 |
| 2026-04-06 12:00 |
16:28:43.05 |
-21:49:40.9 |
HIP 80756 |
17.72 |
| 2026-04-07 00:00 |
16:28:37.99 |
-21:49:35.6 |
HIP 80756 |
18.24 |
| 2026-04-07 12:00 |
16:28:32.82 |
-21:49:29.9 |
HIP 80756 |
18.83 |
| 2026-04-08 00:00 |
16:28:27.53 |
-21:49:24.0 |
HIP 80756 |
19.49 |
| 2026-04-08 12:00 |
16:28:22.12 |
-21:49:17.9 |
HIP 80756 |
20.21 |
| 2026-04-09 00:00 |
16:28:16.59 |
-21:49:11.4 |
HIP 80756 |
21.01 |
| 2026-04-09 12:00 |
16:28:10.95 |
-21:49:04.8 |
HIP 80756 |
21.87 |
| 2026-04-10 00:00 |
16:28:05.19 |
-21:48:57.9 |
HIP 80587 |
22.18 |
| 2026-04-10 12:00 |
16:27:59.32 |
-21:48:50.7 |
HIP 80534 |
20.83 |
| 2026-04-11 00:00 |
16:27:53.33 |
-21:48:43.2 |
HIP 80534 |
19.44 |
| 2026-04-11 12:00 |
16:27:47.23 |
-21:48:35.5 |
HIP 80534 |
18.02 |
| 2026-04-12 00:00 |
16:27:41.01 |
-21:48:27.6 |
HIP 80534 |
16.57 |
| 2026-04-12 12:00 |
16:27:34.69 |
-21:48:19.4 |
HIP 80534 |
15.10 |
| 2026-04-13 00:00 |
16:27:28.25 |
-21:48:10.9 |
HIP 80534 |
13.60 |
| 2026-04-13 12:00 |
16:27:21.70 |
-21:48:02.2 |
HIP 80534 |
12.07 |
| 2026-04-14 00:00 |
16:27:15.04 |
-21:47:53.2 |
HIP 80534 |
10.52 |
| 2026-04-14 12:00 |
16:27:08.27 |
-21:47:44.0 |
HIP 80534 |
8.95 |
| 2026-04-15 00:00 |
16:27:01.39 |
-21:47:34.6 |
HIP 80534 |
7.35 |
| 2026-04-15 12:00 |
16:26:54.40 |
-21:47:24.8 |
HIP 80534 |
5.74 |
| 2026-04-16 00:00 |
16:26:47.31 |
-21:47:14.9 |
HIP 80534 |
4.11 |