| Parameter |
Value |
| Designation |
P/1996 R2 (Lagerkvist) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
1997-01-19T04:33:27.567360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:50Z |
| Obs used |
137 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
20.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1996-10-08.0000000 |
| e |
0.30999078 |
| q (au) |
2.609642 |
| a (au) |
3.782040 |
| i (deg) |
2.605342 |
| Ω (om, deg) |
40.240561 |
| ω (w, deg) |
334.042486 |
| M (ma, deg) |
346.172231 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.462 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.462 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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) |
| 2026-07-29 00:00 |
03:01:06.68 |
+16:25:37.7 |
HIP 14089 |
10.54 |
| 2026-07-29 12:00 |
03:01:44.34 |
+16:28:31.8 |
HIP 14098 |
2.95 |
| 2026-07-30 00:00 |
03:02:21.84 |
+16:31:24.8 |
HIP 14098 |
7.52 |
| 2026-07-30 12:00 |
03:02:59.18 |
+16:34:16.7 |
HIP 14098 |
16.77 |
| 2026-07-31 00:00 |
03:03:36.35 |
+16:37:07.4 |
HIP 14098 |
26.08 |
| 2026-07-31 12:00 |
03:04:13.35 |
+16:39:57.0 |
HIP 14098 |
35.36 |
| 2026-08-01 00:00 |
03:04:50.18 |
+16:42:45.5 |
HIP 14098 |
44.60 |
| 2026-08-01 12:00 |
03:05:26.83 |
+16:45:32.8 |
HIP 14567 |
39.32 |
| 2026-08-02 00:00 |
03:06:03.31 |
+16:48:19.1 |
HIP 14567 |
30.17 |
| 2026-08-02 12:00 |
03:06:39.62 |
+16:51:04.2 |
HIP 14567 |
21.09 |
| 2026-08-03 00:00 |
03:07:15.74 |
+16:53:48.1 |
HIP 14567 |
12.09 |
| 2026-08-03 12:00 |
03:07:51.69 |
+16:56:31.0 |
HIP 14567 |
3.51 |
| 2026-08-04 00:00 |
03:08:27.45 |
+16:59:12.7 |
HIP 14569 |
5.59 |
| 2026-08-04 12:00 |
03:09:03.03 |
+17:01:53.2 |
HIP 14679 |
11.30 |
| 2026-08-05 00:00 |
03:09:38.42 |
+17:04:32.7 |
HIP 14679 |
10.26 |
| 2026-08-05 12:00 |
03:10:13.63 |
+17:07:11.0 |
HIP 14682 |
11.58 |
| 2026-08-06 00:00 |
03:10:48.64 |
+17:09:48.1 |
HIP 14682 |
17.28 |
| 2026-08-06 12:00 |
03:11:23.46 |
+17:12:24.1 |
HIP 14901 |
13.80 |
| 2026-08-07 00:00 |
03:11:58.08 |
+17:14:59.0 |
HIP 14901 |
5.31 |
| 2026-08-07 12:00 |
03:12:32.51 |
+17:17:32.7 |
HIP 14901 |
3.93 |
| 2026-08-08 00:00 |
03:13:06.73 |
+17:20:05.3 |
HIP 14901 |
12.23 |
| 2026-08-08 12:00 |
03:13:40.76 |
+17:22:36.8 |
HIP 14971 |
17.61 |
| 2026-08-09 00:00 |
03:14:14.58 |
+17:25:07.1 |
HIP 14971 |
24.74 |
| 2026-08-09 12:00 |
03:14:48.19 |
+17:27:36.2 |
HIP 15052 |
28.28 |
| 2026-08-10 00:00 |
03:15:21.59 |
+17:30:04.2 |
HIP 15285 |
26.76 |
| 2026-08-10 12:00 |
03:15:54.79 |
+17:32:31.1 |
HIP 15285 |
18.59 |
| 2026-08-11 00:00 |
03:16:27.76 |
+17:34:56.8 |
HIP 15285 |
10.65 |
| 2026-08-11 12:00 |
03:17:00.53 |
+17:37:21.4 |
HIP 15285 |
4.11 |
| 2026-08-12 00:00 |
03:17:33.07 |
+17:39:44.8 |
HIP 15285 |
7.29 |
| 2026-08-12 12:00 |
03:18:05.39 |
+17:42:07.1 |
HIP 15285 |
14.81 |
| 2026-08-13 00:00 |
03:18:37.49 |
+17:44:28.2 |
HIP 15285 |
22.65 |
| 2026-08-13 12:00 |
03:19:09.37 |
+17:46:48.1 |
HIP 15519 |
20.53 |
| 2026-08-14 00:00 |
03:19:41.02 |
+17:49:07.0 |
HIP 15519 |
19.55 |
| 2026-08-14 12:00 |
03:20:12.44 |
+17:51:24.7 |
HIP 15519 |
21.59 |
| 2026-08-15 00:00 |
03:20:43.63 |
+17:53:41.2 |
HIP 15519 |
25.89 |
| 2026-08-15 12:00 |
03:21:14.58 |
+17:55:56.6 |
HIP 15724 |
22.33 |
| 2026-08-16 00:00 |
03:21:45.30 |
+17:58:10.9 |
HIP 15724 |
18.47 |
| 2026-08-16 12:00 |
03:22:15.79 |
+18:00:24.0 |
HIP 15724 |
17.34 |
| 2026-08-17 00:00 |
03:22:46.03 |
+18:02:36.0 |
HIP 15724 |
19.34 |
| 2026-08-17 12:00 |
03:23:16.04 |
+18:04:46.8 |
HIP 15724 |
23.64 |
| 2026-08-18 00:00 |
03:23:45.80 |
+18:06:56.5 |
HIP 15808 |
26.45 |
| 2026-08-18 12:00 |
03:24:15.31 |
+18:09:05.1 |
HIP 15808 |
25.70 |
| 2026-08-19 00:00 |
03:24:44.58 |
+18:11:12.5 |
HIP 15808 |
26.98 |