| 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
$$
M_a = (10.456 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.456 |
| n |
2.000 |
| gf |
0.925 |
| gb |
-0.999 |
| k |
1.000 |
| δ90 |
9.469 |
| 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) |
| 2026-05-12 00:00 |
05:51:35.69 |
-15:02:00.2 |
HIP 27707 |
29.04 |
| 2026-05-12 12:00 |
05:51:37.77 |
-15:01:46.5 |
HIP 27707 |
29.16 |
| 2026-05-13 00:00 |
05:51:39.86 |
-15:01:32.9 |
HIP 27707 |
29.29 |
| 2026-05-13 12:00 |
05:51:41.97 |
-15:01:19.4 |
HIP 27707 |
29.42 |
| 2026-05-14 00:00 |
05:51:44.08 |
-15:01:06.2 |
HIP 27707 |
29.57 |
| 2026-05-14 12:00 |
05:51:46.21 |
-15:00:53.0 |
HIP 27765 |
29.65 |
| 2026-05-15 00:00 |
05:51:48.35 |
-15:00:40.0 |
HIP 27765 |
29.26 |
| 2026-05-15 12:00 |
05:51:50.50 |
-15:00:27.2 |
HIP 27765 |
28.87 |
| 2026-05-16 00:00 |
05:51:52.66 |
-15:00:14.5 |
HIP 27765 |
28.49 |
| 2026-05-16 12:00 |
05:51:54.83 |
-15:00:02.0 |
HIP 27765 |
28.12 |
| 2026-05-17 00:00 |
05:51:57.01 |
-14:59:49.6 |
HIP 27765 |
27.76 |
| 2026-05-17 12:00 |
05:51:59.20 |
-14:59:37.4 |
HIP 27765 |
27.41 |
| 2026-05-18 00:00 |
05:52:01.40 |
-14:59:25.4 |
HIP 27765 |
27.06 |
| 2026-05-18 12:00 |
05:52:03.62 |
-14:59:13.5 |
HIP 27765 |
26.73 |
| 2026-05-19 00:00 |
05:52:05.84 |
-14:59:01.7 |
HIP 27765 |
26.40 |
| 2026-05-19 12:00 |
05:52:08.07 |
-14:58:50.2 |
HIP 27765 |
26.09 |
| 2026-05-20 00:00 |
05:52:10.31 |
-14:58:38.7 |
HIP 27765 |
25.78 |
| 2026-05-20 12:00 |
05:52:12.57 |
-14:58:27.5 |
HIP 27765 |
25.49 |
| 2026-05-21 00:00 |
05:52:14.83 |
-14:58:16.4 |
HIP 27765 |
25.21 |
| 2026-05-21 12:00 |
05:52:17.10 |
-14:58:05.5 |
HIP 27765 |
24.95 |
| 2026-05-22 00:00 |
05:52:19.38 |
-14:57:54.7 |
HIP 27765 |
24.69 |
| 2026-05-22 12:00 |
05:52:21.67 |
-14:57:44.1 |
HIP 27765 |
24.45 |
| 2026-05-23 00:00 |
05:52:23.96 |
-14:57:33.7 |
HIP 27765 |
24.22 |
| 2026-05-23 12:00 |
05:52:26.27 |
-14:57:23.4 |
HIP 27765 |
24.01 |
| 2026-05-24 00:00 |
05:52:28.59 |
-14:57:13.3 |
HIP 27765 |
23.82 |
| 2026-05-24 12:00 |
05:52:30.91 |
-14:57:03.3 |
HIP 27765 |
23.63 |
| 2026-05-25 00:00 |
05:52:33.24 |
-14:56:53.5 |
HIP 27765 |
23.47 |
| 2026-05-25 12:00 |
05:52:35.58 |
-14:56:43.9 |
HIP 27765 |
23.32 |
| 2026-05-26 00:00 |
05:52:37.93 |
-14:56:34.5 |
HIP 27765 |
23.19 |
| 2026-05-26 12:00 |
05:52:40.28 |
-14:56:25.2 |
HIP 27765 |
23.07 |
| 2026-05-27 00:00 |
05:52:42.64 |
-14:56:16.1 |
HIP 27765 |
22.98 |
| 2026-05-27 12:00 |
05:52:45.01 |
-14:56:07.1 |
HIP 27765 |
22.90 |
| 2026-05-28 00:00 |
05:52:47.39 |
-14:55:58.3 |
HIP 27765 |
22.84 |
| 2026-05-28 12:00 |
05:52:49.77 |
-14:55:49.7 |
HIP 27765 |
22.79 |
| 2026-05-29 00:00 |
05:52:52.16 |
-14:55:41.3 |
HIP 27765 |
22.77 |
| 2026-05-29 12:00 |
05:52:54.56 |
-14:55:33.0 |
HIP 27765 |
22.76 |
| 2026-05-30 00:00 |
05:52:56.97 |
-14:55:24.9 |
HIP 27765 |
22.78 |
| 2026-05-30 12:00 |
05:52:59.38 |
-14:55:17.0 |
HIP 27765 |
22.81 |
| 2026-05-31 00:00 |
05:53:01.79 |
-14:55:09.2 |
HIP 27765 |
22.86 |
| 2026-05-31 12:00 |
05:53:04.22 |
-14:55:01.6 |
HIP 27765 |
22.93 |
| 2026-06-01 00:00 |
05:53:06.65 |
-14:54:54.2 |
HIP 27765 |
23.02 |
| 2026-06-01 12:00 |
05:53:09.08 |
-14:54:46.9 |
HIP 27765 |
23.12 |
| 2026-06-02 00:00 |
05:53:11.52 |
-14:54:39.8 |
HIP 27765 |
23.25 |