270P/Gehrels
| Parameter |
Value |
| Designation |
270P/Gehrels |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-07-18T12:29:23.700480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:10Z |
| Obs used |
381 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-07-20.0000000 |
| e |
0.46760427 |
| q (au) |
3.594521 |
| a (au) |
6.751596 |
| i (deg) |
2.859570 |
| Ω (om, deg) |
225.681440 |
| ω (w, deg) |
211.476072 |
| M (ma, deg) |
257.495456 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.875 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.875 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.503 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
19:43:09.01 |
-18:50:00.2 |
HIP 97031 |
16.74 |
| 2026-02-03 12:00 |
19:43:25.81 |
-18:49:14.6 |
HIP 97031 |
17.77 |
| 2026-02-04 00:00 |
19:43:42.58 |
-18:48:28.9 |
HIP 97031 |
19.60 |
| 2026-02-04 12:00 |
19:43:59.32 |
-18:47:43.1 |
HIP 97031 |
22.02 |
| 2026-02-05 00:00 |
19:44:16.03 |
-18:46:57.3 |
HIP 97031 |
24.87 |
| 2026-02-05 12:00 |
19:44:32.70 |
-18:46:11.3 |
HIP 97031 |
27.99 |
| 2026-02-06 00:00 |
19:44:49.35 |
-18:45:25.2 |
HIP 97031 |
31.32 |
| 2026-02-06 12:00 |
19:45:05.96 |
-18:44:39.0 |
HIP 97358 |
31.29 |
| 2026-02-07 00:00 |
19:45:22.54 |
-18:43:52.8 |
HIP 97358 |
27.38 |
| 2026-02-07 12:00 |
19:45:39.09 |
-18:43:06.4 |
HIP 97358 |
23.51 |
| 2026-02-08 00:00 |
19:45:55.60 |
-18:42:20.0 |
HIP 97358 |
19.70 |
| 2026-02-08 12:00 |
19:46:12.07 |
-18:41:33.5 |
HIP 97358 |
15.97 |
| 2026-02-09 00:00 |
19:46:28.52 |
-18:40:46.9 |
HIP 97358 |
12.41 |
| 2026-02-09 12:00 |
19:46:44.92 |
-18:40:00.2 |
HIP 97358 |
9.21 |
| 2026-02-10 00:00 |
19:47:01.29 |
-18:39:13.5 |
HIP 97358 |
6.84 |
| 2026-02-10 12:00 |
19:47:17.62 |
-18:38:26.7 |
HIP 97358 |
6.34 |
| 2026-02-11 00:00 |
19:47:33.91 |
-18:37:39.8 |
HIP 97358 |
8.04 |
| 2026-02-11 12:00 |
19:47:50.16 |
-18:36:52.9 |
HIP 97358 |
10.95 |
| 2026-02-12 00:00 |
19:48:06.37 |
-18:36:05.9 |
HIP 97409 |
12.22 |
| 2026-02-12 12:00 |
19:48:22.54 |
-18:35:18.8 |
HIP 97409 |
13.02 |
| 2026-02-13 00:00 |
19:48:38.67 |
-18:34:31.7 |
HIP 97409 |
14.83 |
| 2026-02-13 12:00 |
19:48:54.76 |
-18:33:44.5 |
HIP 97409 |
17.33 |
| 2026-02-14 00:00 |
19:49:10.80 |
-18:32:57.3 |
HIP 97409 |
20.27 |
| 2026-02-14 12:00 |
19:49:26.81 |
-18:32:10.0 |
HIP 97409 |
23.48 |
| 2026-02-15 00:00 |
19:49:42.76 |
-18:31:22.7 |
HIP 97409 |
26.86 |
| 2026-02-15 12:00 |
19:49:58.68 |
-18:30:35.3 |
HIP 97409 |
30.34 |
| 2026-02-16 00:00 |
19:50:14.54 |
-18:29:47.9 |
HIP 97596 |
32.57 |
| 2026-02-16 12:00 |
19:50:30.36 |
-18:29:00.4 |
HIP 97811 |
30.58 |
| 2026-02-17 00:00 |
19:50:46.14 |
-18:28:12.9 |
HIP 97811 |
26.77 |
| 2026-02-17 12:00 |
19:51:01.86 |
-18:27:25.4 |
HIP 97811 |
22.97 |
| 2026-02-18 00:00 |
19:51:17.54 |
-18:26:37.9 |
HIP 97811 |
19.19 |
| 2026-02-18 12:00 |
19:51:33.17 |
-18:25:50.3 |
HIP 97811 |
15.43 |
| 2026-02-19 00:00 |
19:51:48.75 |
-18:25:02.7 |
HIP 97811 |
11.69 |
| 2026-02-19 12:00 |
19:52:04.28 |
-18:24:15.1 |
HIP 97811 |
8.01 |
| 2026-02-20 00:00 |
19:52:19.75 |
-18:23:27.4 |
HIP 97811 |
4.49 |
| 2026-02-20 12:00 |
19:52:35.18 |
-18:22:39.8 |
HIP 97811 |
2.07 |
| 2026-02-21 00:00 |
19:52:50.55 |
-18:21:52.1 |
HIP 97811 |
4.05 |
| 2026-02-21 12:00 |
19:53:05.87 |
-18:21:04.4 |
HIP 97811 |
7.50 |
| 2026-02-22 00:00 |
19:53:21.13 |
-18:20:16.8 |
HIP 97811 |
11.11 |
| 2026-02-22 12:00 |
19:53:36.35 |
-18:19:29.1 |
HIP 97811 |
14.76 |
| 2026-02-23 00:00 |
19:53:51.50 |
-18:18:41.4 |
HIP 97811 |
18.41 |
| 2026-02-23 12:00 |
19:54:06.60 |
-18:17:53.7 |
HIP 97811 |
22.06 |
| 2026-02-24 00:00 |
19:54:21.64 |
-18:17:06.1 |
HIP 97811 |
25.71 |