메타데이터
| 항목 |
값 |
| Designation |
C/2003 E1 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-02-13T14:29:55.553280Z |
| Orbit solution date (soln_date, UTC) |
2026-07-06T12:12:23Z |
| Obs used |
238 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2003-10-13.0000000 |
| e |
0.76358461 |
| q (au) |
3.244961 |
| a (au) |
13.725677 |
| i (deg) |
33.537822 |
| Ω (om, deg) |
137.069993 |
| ω (w, deg) |
103.859060 |
| M (ma, deg) |
357.604279 |
밝기
산란 + 전체 선형
$$
M_a = (12.327 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
12.327 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.995 |
| 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 |
| 2003-03-09 |
2004-02-05 |
+11.2722 |
-7.340 |
| 2004-02-21 |
2004-09-11 |
+21.5365 |
-11.046 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
04:21:16.23 |
-11:28:28.4 |
HIP 20115 |
39.68 |
| 2026-07-29 12:00 |
04:21:19.17 |
-11:28:54.4 |
HIP 20115 |
40.18 |
| 2026-07-30 00:00 |
04:21:22.07 |
-11:29:20.6 |
HIP 20115 |
40.67 |
| 2026-07-30 12:00 |
04:21:24.94 |
-11:29:47.1 |
HIP 20115 |
41.17 |
| 2026-07-31 00:00 |
04:21:27.78 |
-11:30:13.8 |
HIP 20115 |
41.67 |
| 2026-07-31 12:00 |
04:21:30.58 |
-11:30:40.8 |
HIP 20115 |
42.17 |
| 2026-08-01 00:00 |
04:21:33.35 |
-11:31:08.0 |
HIP 20115 |
42.67 |
| 2026-08-01 12:00 |
04:21:36.09 |
-11:31:35.5 |
HIP 20115 |
43.17 |
| 2026-08-02 00:00 |
04:21:38.79 |
-11:32:03.2 |
HIP 20115 |
43.67 |
| 2026-08-02 12:00 |
04:21:41.46 |
-11:32:31.2 |
HIP 20115 |
44.17 |
| 2026-08-03 00:00 |
04:21:44.09 |
-11:32:59.4 |
HIP 20115 |
44.68 |
| 2026-08-03 12:00 |
04:21:46.69 |
-11:33:27.8 |
HIP 20115 |
45.18 |
| 2026-08-04 00:00 |
04:21:49.25 |
-11:33:56.5 |
HIP 20115 |
45.67 |
| 2026-08-04 12:00 |
04:21:51.78 |
-11:34:25.4 |
HIP 20115 |
46.17 |
| 2026-08-05 00:00 |
04:21:54.27 |
-11:34:54.6 |
HIP 20115 |
46.67 |
| 2026-08-05 12:00 |
04:21:56.73 |
-11:35:24.0 |
HIP 20115 |
47.16 |
| 2026-08-06 00:00 |
04:21:59.15 |
-11:35:53.6 |
HIP 20115 |
47.66 |
| 2026-08-06 12:00 |
04:22:01.54 |
-11:36:23.5 |
HIP 20115 |
48.15 |
| 2026-08-07 00:00 |
04:22:03.89 |
-11:36:53.5 |
HIP 20115 |
48.64 |
| 2026-08-07 12:00 |
04:22:06.20 |
-11:37:23.8 |
HIP 20115 |
49.12 |
| 2026-08-08 00:00 |
04:22:08.48 |
-11:37:54.4 |
HIP 20115 |
49.61 |
| 2026-08-08 12:00 |
04:22:10.72 |
-11:38:25.1 |
HIP 20115 |
50.09 |
| 2026-08-09 00:00 |
04:22:12.92 |
-11:38:56.1 |
HIP 20115 |
50.57 |
| 2026-08-09 12:00 |
04:22:15.09 |
-11:39:27.3 |
HIP 20115 |
51.04 |
| 2026-08-10 00:00 |
04:22:17.22 |
-11:39:58.7 |
HIP 20589 |
50.84 |
| 2026-08-10 12:00 |
04:22:19.31 |
-11:40:30.3 |
HIP 20589 |
50.10 |
| 2026-08-11 00:00 |
04:22:21.36 |
-11:41:02.2 |
HIP 20589 |
49.37 |
| 2026-08-11 12:00 |
04:22:23.38 |
-11:41:34.2 |
HIP 20589 |
48.65 |
| 2026-08-12 00:00 |
04:22:25.36 |
-11:42:06.5 |
HIP 20589 |
47.92 |
| 2026-08-12 12:00 |
04:22:27.30 |
-11:42:38.9 |
HIP 20589 |
47.20 |
| 2026-08-13 00:00 |
04:22:29.20 |
-11:43:11.6 |
HIP 20589 |
46.49 |
| 2026-08-13 12:00 |
04:22:31.06 |
-11:43:44.4 |
HIP 20589 |
45.77 |
| 2026-08-14 00:00 |
04:22:32.89 |
-11:44:17.5 |
HIP 20589 |
45.06 |
| 2026-08-14 12:00 |
04:22:34.67 |
-11:44:50.8 |
HIP 20589 |
44.36 |
| 2026-08-15 00:00 |
04:22:36.42 |
-11:45:24.2 |
HIP 20589 |
43.66 |
| 2026-08-15 12:00 |
04:22:38.13 |
-11:45:57.8 |
HIP 20589 |
42.96 |
| 2026-08-16 00:00 |
04:22:39.80 |
-11:46:31.7 |
HIP 20589 |
42.27 |
| 2026-08-16 12:00 |
04:22:41.43 |
-11:47:05.7 |
HIP 20589 |
41.58 |
| 2026-08-17 00:00 |
04:22:43.02 |
-11:47:39.9 |
HIP 20589 |
40.90 |
| 2026-08-17 12:00 |
04:22:44.57 |
-11:48:14.3 |
HIP 20589 |
40.22 |
| 2026-08-18 00:00 |
04:22:46.08 |
-11:48:48.8 |
HIP 20589 |
39.54 |
| 2026-08-18 12:00 |
04:22:47.55 |
-11:49:23.5 |
HIP 20589 |
38.87 |
| 2026-08-19 00:00 |
04:22:48.99 |
-11:49:58.4 |
HIP 20589 |
38.21 |