메타데이터
| 항목 |
값 |
| Designation |
C/2010 G2 (Hill) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-09-02T01:12:35.795520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:42Z |
| Obs used |
4103 |
| NEO |
- |
| M1 |
10.800 |
| K1 |
6.250 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2011-07-30.0000000 |
| e |
0.97940713 |
| q (au) |
1.980774 |
| a (au) |
96.187351 |
| i (deg) |
103.745283 |
| Ω (om, deg) |
246.781006 |
| ω (w, deg) |
137.425281 |
| M (ma, deg) |
359.964425 |
밝기
산란 + 전체 선형
$$
M_a = (10.330 + 2.265\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.330 |
| n |
2.265 |
| gf |
1.000 |
| gb |
-0.998 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2010-04-10 |
2010-08-28 |
+14.8129 |
-10.677 |
| 2010-08-28 |
2011-05-04 |
-8.0013 |
+3.774 |
| 2011-05-04 |
2011-09-02 |
+19.9294 |
-7.377 |
| 2011-09-02 |
2012-01-01 |
+7.1177 |
-2.882 |
| 2012-01-01 |
2013-03-06 |
+3.5813 |
-2.363 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
23:42:59.54 |
-84:08:10.7 |
HIP 117347 |
18.00 |
| 2026-03-26 12:00 |
23:43:31.76 |
-84:08:18.5 |
HIP 117347 |
17.79 |
| 2026-03-27 00:00 |
23:44:03.96 |
-84:08:26.6 |
HIP 117347 |
17.63 |
| 2026-03-27 12:00 |
23:44:36.14 |
-84:08:35.1 |
HIP 117347 |
17.52 |
| 2026-03-28 00:00 |
23:45:08.28 |
-84:08:44.0 |
HIP 117347 |
17.46 |
| 2026-03-28 12:00 |
23:45:40.40 |
-84:08:53.2 |
HIP 117347 |
17.44 |
| 2026-03-29 00:00 |
23:46:12.49 |
-84:09:02.9 |
HIP 117347 |
17.48 |
| 2026-03-29 12:00 |
23:46:44.55 |
-84:09:12.9 |
HIP 117347 |
17.56 |
| 2026-03-30 00:00 |
23:47:16.58 |
-84:09:23.3 |
HIP 117347 |
17.68 |
| 2026-03-30 12:00 |
23:47:48.58 |
-84:09:34.1 |
HIP 117347 |
17.86 |
| 2026-03-31 00:00 |
23:48:20.55 |
-84:09:45.2 |
HIP 118119 |
17.21 |
| 2026-03-31 12:00 |
23:48:52.49 |
-84:09:56.8 |
HIP 118119 |
16.45 |
| 2026-04-01 00:00 |
23:49:24.39 |
-84:10:08.7 |
HIP 118119 |
15.70 |
| 2026-04-01 12:00 |
23:49:56.27 |
-84:10:21.0 |
HIP 118119 |
14.95 |
| 2026-04-02 00:00 |
23:50:28.11 |
-84:10:33.6 |
HIP 118119 |
14.20 |
| 2026-04-02 12:00 |
23:50:59.92 |
-84:10:46.7 |
HIP 118119 |
13.46 |
| 2026-04-03 00:00 |
23:51:31.69 |
-84:11:00.1 |
HIP 118119 |
12.73 |
| 2026-04-03 12:00 |
23:52:03.44 |
-84:11:13.9 |
HIP 118119 |
12.01 |
| 2026-04-04 00:00 |
23:52:35.14 |
-84:11:28.0 |
HIP 118119 |
11.30 |
| 2026-04-04 12:00 |
23:53:06.81 |
-84:11:42.6 |
HIP 118119 |
10.60 |
| 2026-04-05 00:00 |
23:53:38.45 |
-84:11:57.5 |
HIP 118119 |
9.92 |
| 2026-04-05 12:00 |
23:54:10.05 |
-84:12:12.8 |
HIP 118119 |
9.25 |
| 2026-04-06 00:00 |
23:54:41.61 |
-84:12:28.4 |
HIP 118119 |
8.62 |
| 2026-04-06 12:00 |
23:55:13.13 |
-84:12:44.5 |
HIP 118119 |
8.01 |
| 2026-04-07 00:00 |
23:55:44.62 |
-84:13:00.9 |
HIP 118119 |
7.44 |
| 2026-04-07 12:00 |
23:56:16.06 |
-84:13:17.6 |
HIP 118119 |
6.92 |
| 2026-04-08 00:00 |
23:56:47.47 |
-84:13:34.8 |
HIP 118119 |
6.46 |
| 2026-04-08 12:00 |
23:57:18.83 |
-84:13:52.3 |
HIP 118119 |
6.07 |
| 2026-04-09 00:00 |
23:57:50.16 |
-84:14:10.2 |
HIP 118119 |
5.77 |
| 2026-04-09 12:00 |
23:58:21.44 |
-84:14:28.5 |
HIP 118119 |
5.58 |
| 2026-04-10 00:00 |
23:58:52.68 |
-84:14:47.1 |
HIP 118119 |
5.50 |
| 2026-04-10 12:00 |
23:59:23.87 |
-84:15:06.1 |
HIP 118119 |
5.54 |
| 2026-04-11 00:00 |
23:59:55.03 |
-84:15:25.5 |
HIP 118119 |
5.70 |
| 2026-04-11 12:00 |
00:00:26.13 |
-84:15:45.2 |
HIP 118119 |
5.97 |
| 2026-04-12 00:00 |
00:00:57.19 |
-84:16:05.4 |
HIP 118119 |
6.33 |
| 2026-04-12 12:00 |
00:01:28.21 |
-84:16:25.8 |
HIP 118119 |
6.77 |
| 2026-04-13 00:00 |
00:01:59.17 |
-84:16:46.7 |
HIP 118119 |
7.28 |
| 2026-04-13 12:00 |
00:02:30.09 |
-84:17:07.9 |
HIP 118119 |
7.84 |
| 2026-04-14 00:00 |
00:03:00.96 |
-84:17:29.5 |
HIP 118119 |
8.45 |
| 2026-04-14 12:00 |
00:03:31.78 |
-84:17:51.5 |
HIP 118119 |
9.09 |
| 2026-04-15 00:00 |
00:04:02.54 |
-84:18:13.8 |
HIP 118119 |
9.75 |
| 2026-04-15 12:00 |
00:04:33.26 |
-84:18:36.5 |
HIP 118119 |
10.44 |
| 2026-04-16 00:00 |
00:05:03.92 |
-84:18:59.5 |
HIP 118119 |
11.15 |