| Parameter |
Value |
| Designation |
C/1996 R3 (Lagerkvist) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1995-07-24T19:24:20.646720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:50Z |
| Obs used |
11 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1996-09-25.0000000 |
| e |
0.98703434 |
| q (au) |
5.238237 |
| a (au) |
404.008511 |
| i (deg) |
39.201397 |
| Ω (om, deg) |
172.724584 |
| ω (w, deg) |
130.933238 |
| M (ma, deg) |
0.051970 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.448 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.448 |
| n |
2.000 |
| gf |
0.968 |
| gb |
-0.667 |
| k |
1.000 |
| δ90 |
9.960 |
| 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) |
| 2026-09-20 00:00 |
06:00:00.73 |
-15:33:11.0 |
HIP 28386 |
15.51 |
| 2026-09-20 12:00 |
06:00:00.97 |
-15:33:33.1 |
HIP 28386 |
15.17 |
| 2026-09-21 00:00 |
06:00:01.19 |
-15:33:55.2 |
HIP 28386 |
14.83 |
| 2026-09-21 12:00 |
06:00:01.39 |
-15:34:17.2 |
HIP 28386 |
14.48 |
| 2026-09-22 00:00 |
06:00:01.57 |
-15:34:39.4 |
HIP 28386 |
14.14 |
| 2026-09-22 12:00 |
06:00:01.73 |
-15:35:01.5 |
HIP 28386 |
13.79 |
| 2026-09-23 00:00 |
06:00:01.86 |
-15:35:23.6 |
HIP 28386 |
13.45 |
| 2026-09-23 12:00 |
06:00:01.98 |
-15:35:45.7 |
HIP 28386 |
13.11 |
| 2026-09-24 00:00 |
06:00:02.07 |
-15:36:07.8 |
HIP 28386 |
12.76 |
| 2026-09-24 12:00 |
06:00:02.15 |
-15:36:30.0 |
HIP 28386 |
12.42 |
| 2026-09-25 00:00 |
06:00:02.20 |
-15:36:52.1 |
HIP 28386 |
12.07 |
| 2026-09-25 12:00 |
06:00:02.23 |
-15:37:14.2 |
HIP 28386 |
11.72 |
| 2026-09-26 00:00 |
06:00:02.24 |
-15:37:36.3 |
HIP 28386 |
11.38 |
| 2026-09-26 12:00 |
06:00:02.23 |
-15:37:58.5 |
HIP 28386 |
11.03 |
| 2026-09-27 00:00 |
06:00:02.20 |
-15:38:20.6 |
HIP 28386 |
10.69 |
| 2026-09-27 12:00 |
06:00:02.15 |
-15:38:42.7 |
HIP 28386 |
10.34 |
| 2026-09-28 00:00 |
06:00:02.08 |
-15:39:04.8 |
HIP 28386 |
9.99 |
| 2026-09-28 12:00 |
06:00:01.98 |
-15:39:26.9 |
HIP 28386 |
9.65 |
| 2026-09-29 00:00 |
06:00:01.87 |
-15:39:49.0 |
HIP 28386 |
9.30 |
| 2026-09-29 12:00 |
06:00:01.73 |
-15:40:11.0 |
HIP 28386 |
8.95 |
| 2026-09-30 00:00 |
06:00:01.58 |
-15:40:33.1 |
HIP 28386 |
8.60 |
| 2026-09-30 12:00 |
06:00:01.40 |
-15:40:55.1 |
HIP 28386 |
8.26 |
| 2026-10-01 00:00 |
06:00:01.20 |
-15:41:17.1 |
HIP 28386 |
7.91 |
| 2026-10-01 12:00 |
06:00:00.98 |
-15:41:39.1 |
HIP 28386 |
7.56 |
| 2026-10-02 00:00 |
06:00:00.74 |
-15:42:01.1 |
HIP 28386 |
7.21 |
| 2026-10-02 12:00 |
06:00:00.48 |
-15:42:23.0 |
HIP 28386 |
6.87 |
| 2026-10-03 00:00 |
06:00:00.20 |
-15:42:45.0 |
HIP 28386 |
6.52 |
| 2026-10-03 12:00 |
05:59:59.89 |
-15:43:06.9 |
HIP 28386 |
6.17 |
| 2026-10-04 00:00 |
05:59:59.57 |
-15:43:28.8 |
HIP 28386 |
5.82 |
| 2026-10-04 12:00 |
05:59:59.22 |
-15:43:50.6 |
HIP 28386 |
5.48 |
| 2026-10-05 00:00 |
05:59:58.86 |
-15:44:12.4 |
HIP 28386 |
5.14 |
| 2026-10-05 12:00 |
05:59:58.47 |
-15:44:34.2 |
HIP 28386 |
4.79 |
| 2026-10-06 00:00 |
05:59:58.06 |
-15:44:55.9 |
HIP 28386 |
4.45 |
| 2026-10-06 12:00 |
05:59:57.63 |
-15:45:17.6 |
HIP 28386 |
4.12 |
| 2026-10-07 00:00 |
05:59:57.18 |
-15:45:39.3 |
HIP 28386 |
3.78 |
| 2026-10-07 12:00 |
05:59:56.71 |
-15:46:01.0 |
HIP 28386 |
3.46 |
| 2026-10-08 00:00 |
05:59:56.22 |
-15:46:22.5 |
HIP 28386 |
3.14 |
| 2026-10-08 12:00 |
05:59:55.71 |
-15:46:44.1 |
HIP 28386 |
2.83 |
| 2026-10-09 00:00 |
05:59:55.17 |
-15:47:05.6 |
HIP 28386 |
2.54 |
| 2026-10-09 12:00 |
05:59:54.62 |
-15:47:27.0 |
HIP 28386 |
2.27 |
| 2026-10-10 00:00 |
05:59:54.04 |
-15:47:48.4 |
HIP 28386 |
2.03 |
| 2026-10-10 12:00 |
05:59:53.45 |
-15:48:09.8 |
HIP 28386 |
1.83 |
| 2026-10-11 00:00 |
05:59:52.83 |
-15:48:31.1 |
HIP 28386 |
1.69 |