| Parameter |
Value |
| Designation |
C/2002 B2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-04-06T19:53:33.659520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:13Z |
| Obs used |
52 |
| NEO |
- |
| M1 |
10.100 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-02-21.0000000 |
| e |
0.99722476 |
| q (au) |
3.842167 |
| a (au) |
1384.445431 |
| i (deg) |
152.872587 |
| Ω (om, deg) |
54.316972 |
| ω (w, deg) |
257.070080 |
| M (ma, deg) |
359.999142 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.373 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.373 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
2.176 |
| 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 |
00:29:54.74 |
+23:06:30.5 |
HIP 2397 |
21.98 |
| 2026-07-29 12:00 |
00:29:53.27 |
+23:06:35.4 |
HIP 2397 |
22.19 |
| 2026-07-30 00:00 |
00:29:51.78 |
+23:06:40.0 |
HIP 2397 |
22.39 |
| 2026-07-30 12:00 |
00:29:50.28 |
+23:06:44.5 |
HIP 2397 |
22.60 |
| 2026-07-31 00:00 |
00:29:48.75 |
+23:06:48.9 |
HIP 2397 |
22.82 |
| 2026-07-31 12:00 |
00:29:47.20 |
+23:06:53.1 |
HIP 2397 |
23.03 |
| 2026-08-01 00:00 |
00:29:45.63 |
+23:06:57.1 |
HIP 2397 |
23.25 |
| 2026-08-01 12:00 |
00:29:44.04 |
+23:07:00.9 |
HIP 2397 |
23.48 |
| 2026-08-02 00:00 |
00:29:42.44 |
+23:07:04.6 |
HIP 2397 |
23.70 |
| 2026-08-02 12:00 |
00:29:40.81 |
+23:07:08.1 |
HIP 2397 |
23.93 |
| 2026-08-03 00:00 |
00:29:39.16 |
+23:07:11.4 |
HIP 2397 |
24.17 |
| 2026-08-03 12:00 |
00:29:37.49 |
+23:07:14.6 |
HIP 2397 |
24.40 |
| 2026-08-04 00:00 |
00:29:35.80 |
+23:07:17.6 |
HIP 2397 |
24.64 |
| 2026-08-04 12:00 |
00:29:34.10 |
+23:07:20.4 |
HIP 2397 |
24.89 |
| 2026-08-05 00:00 |
00:29:32.37 |
+23:07:23.1 |
HIP 2397 |
25.14 |
| 2026-08-05 12:00 |
00:29:30.62 |
+23:07:25.6 |
HIP 2397 |
25.39 |
| 2026-08-06 00:00 |
00:29:28.86 |
+23:07:27.9 |
HIP 2397 |
25.65 |
| 2026-08-06 12:00 |
00:29:27.07 |
+23:07:30.0 |
HIP 2397 |
25.91 |
| 2026-08-07 00:00 |
00:29:25.27 |
+23:07:32.0 |
HIP 2397 |
26.17 |
| 2026-08-07 12:00 |
00:29:23.44 |
+23:07:33.8 |
HIP 2397 |
26.44 |
| 2026-08-08 00:00 |
00:29:21.60 |
+23:07:35.4 |
HIP 2397 |
26.71 |
| 2026-08-08 12:00 |
00:29:19.74 |
+23:07:36.8 |
HIP 2397 |
26.99 |
| 2026-08-09 00:00 |
00:29:17.86 |
+23:07:38.1 |
HIP 2397 |
27.27 |
| 2026-08-09 12:00 |
00:29:15.96 |
+23:07:39.2 |
HIP 2397 |
27.56 |
| 2026-08-10 00:00 |
00:29:14.05 |
+23:07:40.1 |
HIP 2397 |
27.85 |
| 2026-08-10 12:00 |
00:29:12.11 |
+23:07:40.9 |
HIP 2397 |
28.14 |
| 2026-08-11 00:00 |
00:29:10.16 |
+23:07:41.4 |
HIP 2197 |
28.09 |
| 2026-08-11 12:00 |
00:29:08.19 |
+23:07:41.8 |
HIP 2197 |
27.78 |
| 2026-08-12 00:00 |
00:29:06.20 |
+23:07:42.0 |
HIP 2197 |
27.47 |
| 2026-08-12 12:00 |
00:29:04.19 |
+23:07:42.1 |
HIP 2197 |
27.16 |
| 2026-08-13 00:00 |
00:29:02.16 |
+23:07:41.9 |
HIP 2197 |
26.86 |
| 2026-08-13 12:00 |
00:29:00.12 |
+23:07:41.6 |
HIP 2197 |
26.56 |
| 2026-08-14 00:00 |
00:28:58.06 |
+23:07:41.1 |
HIP 2197 |
26.26 |
| 2026-08-14 12:00 |
00:28:55.98 |
+23:07:40.5 |
HIP 2197 |
25.97 |
| 2026-08-15 00:00 |
00:28:53.88 |
+23:07:39.6 |
HIP 2197 |
25.69 |
| 2026-08-15 12:00 |
00:28:51.77 |
+23:07:38.6 |
HIP 2197 |
25.41 |
| 2026-08-16 00:00 |
00:28:49.64 |
+23:07:37.4 |
HIP 2197 |
25.14 |
| 2026-08-16 12:00 |
00:28:47.49 |
+23:07:36.0 |
HIP 2197 |
24.87 |
| 2026-08-17 00:00 |
00:28:45.33 |
+23:07:34.5 |
HIP 2197 |
24.62 |
| 2026-08-17 12:00 |
00:28:43.15 |
+23:07:32.7 |
HIP 2197 |
24.37 |
| 2026-08-18 00:00 |
00:28:40.96 |
+23:07:30.8 |
HIP 2197 |
24.13 |
| 2026-08-18 12:00 |
00:28:38.75 |
+23:07:28.7 |
HIP 2197 |
23.89 |
| 2026-08-19 00:00 |
00:28:36.52 |
+23:07:26.5 |
HIP 2197 |
23.67 |