| Parameter |
Value |
| Designation |
197P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2008-05-18T23:56:01.968000Z |
| Orbit solution date (soln_date, UTC) |
2023-10-20T22:43:21Z |
| Obs used |
325 |
| NEO |
Yes |
| M1 |
18.200 |
| K1 |
5.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2006-09-26.0000000 |
| e |
0.62994097 |
| q (au) |
1.061109 |
| a (au) |
2.867406 |
| i (deg) |
25.556064 |
| Ω (om, deg) |
66.395886 |
| ω (w, deg) |
188.752044 |
| M (ma, deg) |
238.004767 |
Magnitude
Scatter + Global Linear
$$
M_a = (20.000 + 3.342\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
20.000 |
| n |
3.342 |
| gf |
0.971 |
| gb |
-1.000 |
| k |
0.969 |
| δ90 |
4.109 |
| 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) |
| 2026-03-26 00:00 |
05:10:34.49 |
+34:29:58.9 |
HIP 23998 |
25.41 |
| 2026-03-26 12:00 |
05:10:50.44 |
+34:29:50.4 |
HIP 23998 |
27.30 |
| 2026-03-27 00:00 |
05:11:06.61 |
+34:29:42.2 |
HIP 24288 |
28.21 |
| 2026-03-27 12:00 |
05:11:22.98 |
+34:29:34.4 |
HIP 24288 |
26.01 |
| 2026-03-28 00:00 |
05:11:39.57 |
+34:29:26.9 |
HIP 24288 |
24.05 |
| 2026-03-28 12:00 |
05:11:56.37 |
+34:29:19.8 |
HIP 24288 |
22.41 |
| 2026-03-29 00:00 |
05:12:13.37 |
+34:29:13.1 |
HIP 24288 |
21.20 |
| 2026-03-29 12:00 |
05:12:30.58 |
+34:29:06.7 |
HIP 24288 |
20.51 |
| 2026-03-30 00:00 |
05:12:47.99 |
+34:29:00.6 |
HIP 24288 |
20.41 |
| 2026-03-30 12:00 |
05:13:05.61 |
+34:28:54.8 |
HIP 24288 |
20.94 |
| 2026-03-31 00:00 |
05:13:23.43 |
+34:28:49.4 |
HIP 24288 |
22.06 |
| 2026-03-31 12:00 |
05:13:41.45 |
+34:28:44.3 |
HIP 24288 |
23.73 |
| 2026-04-01 00:00 |
05:13:59.67 |
+34:28:39.6 |
HIP 24538 |
23.63 |
| 2026-04-01 12:00 |
05:14:18.08 |
+34:28:35.1 |
HIP 24538 |
19.86 |
| 2026-04-02 00:00 |
05:14:36.69 |
+34:28:31.0 |
HIP 24538 |
16.07 |
| 2026-04-02 12:00 |
05:14:55.50 |
+34:28:27.2 |
HIP 24538 |
12.28 |
| 2026-04-03 00:00 |
05:15:14.50 |
+34:28:23.7 |
HIP 24538 |
8.52 |
| 2026-04-03 12:00 |
05:15:33.69 |
+34:28:20.5 |
HIP 24538 |
4.98 |
| 2026-04-04 00:00 |
05:15:53.08 |
+34:28:17.6 |
HIP 24538 |
2.89 |
| 2026-04-04 12:00 |
05:16:12.65 |
+34:28:15.0 |
HIP 24538 |
4.92 |
| 2026-04-05 00:00 |
05:16:32.41 |
+34:28:12.7 |
HIP 24538 |
8.56 |
| 2026-04-05 12:00 |
05:16:52.36 |
+34:28:10.7 |
HIP 24575 |
11.79 |
| 2026-04-06 00:00 |
05:17:12.50 |
+34:28:09.0 |
HIP 24575 |
14.64 |
| 2026-04-06 12:00 |
05:17:32.82 |
+34:28:07.6 |
HIP 24575 |
18.04 |
| 2026-04-07 00:00 |
05:17:53.32 |
+34:28:06.5 |
HIP 24575 |
21.76 |
| 2026-04-07 12:00 |
05:18:14.01 |
+34:28:05.6 |
HIP 24575 |
25.67 |
| 2026-04-08 00:00 |
05:18:34.88 |
+34:28:05.0 |
HIP 24821 |
26.68 |
| 2026-04-08 12:00 |
05:18:55.93 |
+34:28:04.7 |
HIP 24821 |
25.67 |
| 2026-04-09 00:00 |
05:19:17.16 |
+34:28:04.6 |
HIP 24962 |
22.61 |
| 2026-04-09 12:00 |
05:19:38.57 |
+34:28:04.9 |
HIP 24962 |
19.02 |
| 2026-04-10 00:00 |
05:20:00.15 |
+34:28:05.3 |
HIP 24962 |
15.83 |
| 2026-04-10 12:00 |
05:20:21.91 |
+34:28:06.1 |
HIP 24962 |
13.37 |
| 2026-04-11 00:00 |
05:20:43.85 |
+34:28:07.0 |
HIP 24962 |
12.13 |
| 2026-04-11 12:00 |
05:21:05.96 |
+34:28:08.3 |
HIP 24962 |
12.53 |
| 2026-04-12 00:00 |
05:21:28.24 |
+34:28:09.7 |
HIP 24962 |
14.46 |
| 2026-04-12 12:00 |
05:21:50.69 |
+34:28:11.5 |
HIP 25030 |
16.74 |
| 2026-04-13 00:00 |
05:22:13.31 |
+34:28:13.4 |
HIP 25030 |
18.16 |
| 2026-04-13 12:00 |
05:22:36.10 |
+34:28:15.6 |
HIP 25030 |
20.58 |
| 2026-04-14 00:00 |
05:22:59.06 |
+34:28:18.0 |
HIP 25030 |
23.71 |
| 2026-04-14 12:00 |
05:23:22.18 |
+34:28:20.7 |
HIP 25030 |
27.33 |
| 2026-04-15 00:00 |
05:23:45.48 |
+34:28:23.5 |
HIP 25357 |
26.80 |
| 2026-04-15 12:00 |
05:24:08.93 |
+34:28:26.6 |
HIP 25357 |
23.47 |
| 2026-04-16 00:00 |
05:24:32.55 |
+34:28:29.9 |
HIP 25357 |
20.73 |