| Parameter |
Value |
| Designation |
216P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-05-30T22:32:33.506880Z |
| Orbit solution date (soln_date, UTC) |
2024-07-07T00:42:15Z |
| Obs used |
403 |
| NEO |
- |
| M1 |
10.700 |
| K1 |
21.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-04-30.0000000 |
| e |
0.44545351 |
| q (au) |
2.148896 |
| a (au) |
3.875051 |
| i (deg) |
9.046729 |
| Ω (om, deg) |
359.865529 |
| ω (w, deg) |
151.513702 |
| M (ma, deg) |
43.163177 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.693 + 5.566\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.693 |
| n |
5.566 |
| gf |
1.000 |
| gb |
-0.943 |
| 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) |
| 2026-09-20 00:00 |
20:14:47.06 |
-28:01:00.3 |
HIP 99844 |
29.10 |
| 2026-09-20 12:00 |
20:14:41.10 |
-28:00:21.7 |
HIP 99844 |
30.12 |
| 2026-09-21 00:00 |
20:14:35.35 |
-27:59:42.4 |
HIP 99844 |
31.17 |
| 2026-09-21 12:00 |
20:14:29.82 |
-27:59:02.3 |
HIP 99844 |
32.24 |
| 2026-09-22 00:00 |
20:14:24.51 |
-27:58:21.6 |
HIP 99844 |
33.32 |
| 2026-09-22 12:00 |
20:14:19.42 |
-27:57:40.1 |
HIP 99844 |
34.42 |
| 2026-09-23 00:00 |
20:14:14.54 |
-27:56:58.0 |
HIP 99844 |
35.52 |
| 2026-09-23 12:00 |
20:14:09.88 |
-27:56:15.1 |
HIP 99844 |
36.62 |
| 2026-09-24 00:00 |
20:14:05.44 |
-27:55:31.5 |
HIP 99844 |
37.71 |
| 2026-09-24 12:00 |
20:14:01.22 |
-27:54:47.3 |
HIP 99932 |
38.58 |
| 2026-09-25 00:00 |
20:13:57.21 |
-27:54:02.4 |
HIP 99932 |
39.02 |
| 2026-09-25 12:00 |
20:13:53.42 |
-27:53:16.8 |
HIP 99932 |
39.43 |
| 2026-09-26 00:00 |
20:13:49.85 |
-27:52:30.5 |
HIP 99932 |
39.83 |
| 2026-09-26 12:00 |
20:13:46.49 |
-27:51:43.6 |
HIP 99932 |
40.20 |
| 2026-09-27 00:00 |
20:13:43.35 |
-27:50:56.0 |
HIP 99932 |
40.55 |
| 2026-09-27 12:00 |
20:13:40.43 |
-27:50:07.8 |
HIP 99932 |
40.87 |
| 2026-09-28 00:00 |
20:13:37.72 |
-27:49:18.9 |
HIP 99499 |
40.33 |
| 2026-09-28 12:00 |
20:13:35.23 |
-27:48:29.4 |
HIP 99499 |
39.35 |
| 2026-09-29 00:00 |
20:13:32.96 |
-27:47:39.3 |
HIP 99499 |
38.40 |
| 2026-09-29 12:00 |
20:13:30.90 |
-27:46:48.5 |
HIP 99499 |
37.47 |
| 2026-09-30 00:00 |
20:13:29.06 |
-27:45:57.1 |
HIP 99499 |
36.57 |
| 2026-09-30 12:00 |
20:13:27.43 |
-27:45:05.1 |
HIP 99499 |
35.70 |
| 2026-10-01 00:00 |
20:13:26.01 |
-27:44:12.5 |
HIP 99499 |
34.86 |
| 2026-10-01 12:00 |
20:13:24.81 |
-27:43:19.2 |
HIP 99499 |
34.05 |
| 2026-10-02 00:00 |
20:13:23.83 |
-27:42:25.4 |
HIP 99499 |
33.28 |
| 2026-10-02 12:00 |
20:13:23.06 |
-27:41:31.0 |
HIP 99499 |
32.54 |
| 2026-10-03 00:00 |
20:13:22.50 |
-27:40:35.9 |
HIP 99499 |
31.84 |
| 2026-10-03 12:00 |
20:13:22.16 |
-27:39:40.3 |
HIP 99499 |
31.18 |
| 2026-10-04 00:00 |
20:13:22.03 |
-27:38:44.1 |
HIP 99499 |
30.57 |
| 2026-10-04 12:00 |
20:13:22.12 |
-27:37:47.3 |
HIP 99499 |
30.00 |
| 2026-10-05 00:00 |
20:13:22.41 |
-27:36:49.9 |
HIP 99499 |
29.49 |
| 2026-10-05 12:00 |
20:13:22.93 |
-27:35:52.0 |
HIP 99499 |
29.04 |
| 2026-10-06 00:00 |
20:13:23.65 |
-27:34:53.4 |
HIP 99499 |
28.64 |
| 2026-10-06 12:00 |
20:13:24.58 |
-27:33:54.3 |
HIP 99499 |
28.31 |
| 2026-10-07 00:00 |
20:13:25.73 |
-27:32:54.7 |
HIP 99499 |
28.05 |
| 2026-10-07 12:00 |
20:13:27.09 |
-27:31:54.5 |
HIP 99499 |
27.86 |
| 2026-10-08 00:00 |
20:13:28.66 |
-27:30:53.7 |
HIP 99499 |
27.76 |
| 2026-10-08 12:00 |
20:13:30.43 |
-27:29:52.4 |
HIP 99499 |
27.73 |
| 2026-10-09 00:00 |
20:13:32.42 |
-27:28:50.5 |
HIP 99499 |
27.78 |
| 2026-10-09 12:00 |
20:13:34.62 |
-27:27:48.1 |
HIP 99499 |
27.93 |
| 2026-10-10 00:00 |
20:13:37.03 |
-27:26:45.2 |
HIP 99499 |
28.16 |
| 2026-10-10 12:00 |
20:13:39.64 |
-27:25:41.7 |
HIP 99499 |
28.48 |
| 2026-10-11 00:00 |
20:13:42.46 |
-27:24:37.7 |
HIP 99499 |
28.90 |