| 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 |
0.999 |
| 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) |
| 2026-06-01 00:00 |
16:10:45.70 |
-21:17:44.0 |
HIP 79300 |
3.65 |
| 2026-06-01 12:00 |
16:10:33.85 |
-21:17:19.0 |
HIP 79300 |
6.40 |
| 2026-06-02 00:00 |
16:10:22.01 |
-21:16:54.0 |
HIP 79300 |
9.17 |
| 2026-06-02 12:00 |
16:10:10.20 |
-21:16:29.0 |
HIP 79300 |
11.95 |
| 2026-06-03 00:00 |
16:09:58.40 |
-21:16:03.9 |
HIP 79300 |
14.72 |
| 2026-06-03 12:00 |
16:09:46.63 |
-21:15:38.9 |
HIP 79300 |
17.50 |
| 2026-06-04 00:00 |
16:09:34.87 |
-21:15:13.8 |
HIP 79300 |
20.26 |
| 2026-06-04 12:00 |
16:09:23.14 |
-21:14:48.8 |
HIP 79300 |
23.03 |
| 2026-06-05 00:00 |
16:09:11.44 |
-21:14:23.7 |
HIP 79020 |
22.70 |
| 2026-06-05 12:00 |
16:08:59.76 |
-21:13:58.7 |
HIP 79020 |
20.53 |
| 2026-06-06 00:00 |
16:08:48.11 |
-21:13:33.6 |
HIP 79020 |
18.52 |
| 2026-06-06 12:00 |
16:08:36.48 |
-21:13:08.6 |
HIP 79020 |
16.73 |
| 2026-06-07 00:00 |
16:08:24.89 |
-21:12:43.6 |
HIP 79020 |
15.23 |
| 2026-06-07 12:00 |
16:08:13.33 |
-21:12:18.6 |
HIP 79020 |
14.10 |
| 2026-06-08 00:00 |
16:08:01.81 |
-21:11:53.6 |
HIP 79020 |
13.44 |
| 2026-06-08 12:00 |
16:07:50.31 |
-21:11:28.7 |
HIP 79020 |
13.31 |
| 2026-06-09 00:00 |
16:07:38.86 |
-21:11:03.8 |
HIP 79020 |
13.73 |
| 2026-06-09 12:00 |
16:07:27.44 |
-21:10:39.0 |
HIP 79020 |
14.64 |
| 2026-06-10 00:00 |
16:07:16.07 |
-21:10:14.1 |
HIP 79020 |
15.95 |
| 2026-06-10 12:00 |
16:07:04.73 |
-21:09:49.4 |
HIP 79020 |
17.57 |
| 2026-06-11 00:00 |
16:06:53.43 |
-21:09:24.7 |
HIP 78990 |
18.73 |
| 2026-06-11 12:00 |
16:06:42.18 |
-21:09:00.0 |
HIP 78990 |
19.53 |
| 2026-06-12 00:00 |
16:06:30.98 |
-21:08:35.4 |
HIP 78990 |
20.64 |
| 2026-06-12 12:00 |
16:06:19.82 |
-21:08:10.9 |
HIP 78990 |
22.01 |
| 2026-06-13 00:00 |
16:06:08.71 |
-21:07:46.5 |
HIP 78990 |
23.59 |
| 2026-06-13 12:00 |
16:05:57.65 |
-21:07:22.1 |
HIP 78990 |
25.33 |
| 2026-06-14 00:00 |
16:05:46.64 |
-21:06:57.8 |
HIP 78990 |
27.20 |
| 2026-06-14 12:00 |
16:05:35.68 |
-21:06:33.6 |
HIP 78990 |
29.18 |
| 2026-06-15 00:00 |
16:05:24.78 |
-21:06:09.5 |
HIP 78990 |
31.23 |
| 2026-06-15 12:00 |
16:05:13.93 |
-21:05:45.5 |
HIP 78990 |
33.35 |
| 2026-06-16 00:00 |
16:05:03.14 |
-21:05:21.5 |
HIP 78933 |
35.22 |
| 2026-06-16 12:00 |
16:04:52.41 |
-21:04:57.7 |
HIP 78933 |
36.75 |
| 2026-06-17 00:00 |
16:04:41.73 |
-21:04:34.0 |
HIP 78933 |
38.37 |
| 2026-06-17 12:00 |
16:04:31.12 |
-21:04:10.4 |
HIP 78543 |
38.82 |
| 2026-06-18 00:00 |
16:04:20.57 |
-21:03:46.9 |
HIP 78543 |
36.49 |
| 2026-06-18 12:00 |
16:04:10.09 |
-21:03:23.5 |
HIP 78543 |
34.19 |
| 2026-06-19 00:00 |
16:03:59.67 |
-21:03:00.3 |
HIP 78543 |
31.94 |
| 2026-06-19 12:00 |
16:03:49.32 |
-21:02:37.2 |
HIP 78543 |
29.73 |
| 2026-06-20 00:00 |
16:03:39.03 |
-21:02:14.2 |
HIP 78543 |
27.57 |
| 2026-06-20 12:00 |
16:03:28.81 |
-21:01:51.3 |
HIP 78543 |
25.48 |
| 2026-06-21 00:00 |
16:03:18.67 |
-21:01:28.6 |
HIP 78543 |
23.46 |
| 2026-06-21 12:00 |
16:03:08.59 |
-21:01:06.0 |
HIP 78543 |
21.54 |
| 2026-06-22 00:00 |
16:02:58.59 |
-21:00:43.6 |
HIP 78543 |
19.73 |