메타데이터
| 항목 |
값 |
| 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 궤도요소
| 항목 |
값 |
| 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 |
밝기
산란 + 전체 선형
$$
M_a = (7.051 + 5.884\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.051 |
| n |
5.884 |
| gf |
0.993 |
| gb |
-0.979 |
| k |
1.000 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
찾아보기
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
19:39:02.57 |
-18:25:09.4 |
HIP 96496 |
30.47 |
| 2026-09-25 12:00 |
19:39:01.44 |
-18:25:23.1 |
HIP 96496 |
30.31 |
| 2026-09-26 00:00 |
19:39:00.45 |
-18:25:36.4 |
HIP 96496 |
30.17 |
| 2026-09-26 12:00 |
19:38:59.60 |
-18:25:49.4 |
HIP 96496 |
30.07 |
| 2026-09-27 00:00 |
19:38:58.89 |
-18:26:02.1 |
HIP 96496 |
30.00 |
| 2026-09-27 12:00 |
19:38:58.32 |
-18:26:14.5 |
HIP 96496 |
29.96 |
| 2026-09-28 00:00 |
19:38:57.88 |
-18:26:26.6 |
HIP 96496 |
29.95 |
| 2026-09-28 12:00 |
19:38:57.59 |
-18:26:38.3 |
HIP 96496 |
29.97 |
| 2026-09-29 00:00 |
19:38:57.43 |
-18:26:49.8 |
HIP 96496 |
30.02 |
| 2026-09-29 12:00 |
19:38:57.41 |
-18:27:00.9 |
HIP 96496 |
30.10 |
| 2026-09-30 00:00 |
19:38:57.53 |
-18:27:11.7 |
HIP 96496 |
30.20 |
| 2026-09-30 12:00 |
19:38:57.79 |
-18:27:22.2 |
HIP 96496 |
30.33 |
| 2026-10-01 00:00 |
19:38:58.18 |
-18:27:32.3 |
HIP 96496 |
30.49 |
| 2026-10-01 12:00 |
19:38:58.72 |
-18:27:42.2 |
HIP 96496 |
30.68 |
| 2026-10-02 00:00 |
19:38:59.39 |
-18:27:51.7 |
HIP 96496 |
30.89 |
| 2026-10-02 12:00 |
19:39:00.20 |
-18:28:00.9 |
HIP 96496 |
31.13 |
| 2026-10-03 00:00 |
19:39:01.15 |
-18:28:09.8 |
HIP 96496 |
31.40 |
| 2026-10-03 12:00 |
19:39:02.24 |
-18:28:18.3 |
HIP 96496 |
31.70 |
| 2026-10-04 00:00 |
19:39:03.47 |
-18:28:26.5 |
HIP 96496 |
32.02 |
| 2026-10-04 12:00 |
19:39:04.84 |
-18:28:34.4 |
HIP 96496 |
32.37 |
| 2026-10-05 00:00 |
19:39:06.35 |
-18:28:41.9 |
HIP 96496 |
32.74 |
| 2026-10-05 12:00 |
19:39:07.99 |
-18:28:49.2 |
HIP 96496 |
33.15 |
| 2026-10-06 00:00 |
19:39:09.78 |
-18:28:56.1 |
HIP 96496 |
33.58 |
| 2026-10-06 12:00 |
19:39:11.70 |
-18:29:02.6 |
HIP 96496 |
34.03 |
| 2026-10-07 00:00 |
19:39:13.76 |
-18:29:08.8 |
HIP 96496 |
34.52 |
| 2026-10-07 12:00 |
19:39:15.97 |
-18:29:14.7 |
HIP 96496 |
35.03 |
| 2026-10-08 00:00 |
19:39:18.31 |
-18:29:20.2 |
HIP 96496 |
35.57 |
| 2026-10-08 12:00 |
19:39:20.79 |
-18:29:25.4 |
HIP 96496 |
36.14 |
| 2026-10-09 00:00 |
19:39:23.40 |
-18:29:30.3 |
HIP 96496 |
36.73 |
| 2026-10-09 12:00 |
19:39:26.16 |
-18:29:34.8 |
HIP 96496 |
37.36 |
| 2026-10-10 00:00 |
19:39:29.05 |
-18:29:39.0 |
HIP 96496 |
38.01 |
| 2026-10-10 12:00 |
19:39:32.09 |
-18:29:42.8 |
HIP 96496 |
38.69 |
| 2026-10-11 00:00 |
19:39:35.26 |
-18:29:46.3 |
HIP 96496 |
39.40 |
| 2026-10-11 12:00 |
19:39:38.57 |
-18:29:49.4 |
HIP 96496 |
40.14 |
| 2026-10-12 00:00 |
19:39:42.01 |
-18:29:52.2 |
HIP 96496 |
40.91 |
| 2026-10-12 12:00 |
19:39:45.59 |
-18:29:54.6 |
HIP 96496 |
41.71 |
| 2026-10-13 00:00 |
19:39:49.31 |
-18:29:56.7 |
HIP 96496 |
42.54 |
| 2026-10-13 12:00 |
19:39:53.17 |
-18:29:58.5 |
HIP 96496 |
43.40 |
| 2026-10-14 00:00 |
19:39:57.16 |
-18:29:59.9 |
HIP 96921 |
43.48 |
| 2026-10-14 12:00 |
19:40:01.29 |
-18:30:00.9 |
HIP 96921 |
42.80 |
| 2026-10-15 00:00 |
19:40:05.55 |
-18:30:01.6 |
HIP 96921 |
42.12 |
| 2026-10-15 12:00 |
19:40:09.95 |
-18:30:01.9 |
HIP 96921 |
41.41 |
| 2026-10-16 00:00 |
19:40:14.48 |
-18:30:01.9 |
HIP 96921 |
40.70 |