메타데이터
| 항목 |
값 |
| Designation |
C/1997 A1 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1997-06-19T14:28:23.399040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:50Z |
| Obs used |
197 |
| NEO |
- |
| M1 |
9.500 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1997-03-14.0000000 |
| e |
1.00212808 |
| q (au) |
3.157173 |
| a (au) |
-1483.580380 |
| i (deg) |
145.071692 |
| Ω (om, deg) |
135.766697 |
| ω (w, deg) |
40.016058 |
| M (ma, deg) |
-0.001683 |
밝기
산란 + 전체 선형
$$
M_a = (7.011 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.011 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
20:39:28.63 |
-25:01:19.4 |
HIP 102047 |
18.42 |
| 2026-09-25 12:00 |
20:39:27.12 |
-25:01:22.5 |
HIP 102047 |
18.76 |
| 2026-09-26 00:00 |
20:39:25.63 |
-25:01:25.4 |
HIP 102047 |
19.09 |
| 2026-09-26 12:00 |
20:39:24.15 |
-25:01:28.3 |
HIP 102047 |
19.42 |
| 2026-09-27 00:00 |
20:39:22.69 |
-25:01:31.1 |
HIP 102047 |
19.75 |
| 2026-09-27 12:00 |
20:39:21.26 |
-25:01:33.8 |
HIP 102047 |
20.07 |
| 2026-09-28 00:00 |
20:39:19.84 |
-25:01:36.4 |
HIP 102047 |
20.39 |
| 2026-09-28 12:00 |
20:39:18.43 |
-25:01:39.0 |
HIP 101808 |
20.14 |
| 2026-09-29 00:00 |
20:39:17.05 |
-25:01:41.4 |
HIP 101808 |
19.82 |
| 2026-09-29 12:00 |
20:39:15.69 |
-25:01:43.8 |
HIP 101808 |
19.51 |
| 2026-09-30 00:00 |
20:39:14.34 |
-25:01:46.1 |
HIP 101808 |
19.21 |
| 2026-09-30 12:00 |
20:39:13.01 |
-25:01:48.3 |
HIP 101808 |
18.91 |
| 2026-10-01 00:00 |
20:39:11.71 |
-25:01:50.4 |
HIP 101808 |
18.61 |
| 2026-10-01 12:00 |
20:39:10.42 |
-25:01:52.5 |
HIP 101808 |
18.32 |
| 2026-10-02 00:00 |
20:39:09.15 |
-25:01:54.4 |
HIP 101808 |
18.04 |
| 2026-10-02 12:00 |
20:39:07.90 |
-25:01:56.3 |
HIP 101808 |
17.76 |
| 2026-10-03 00:00 |
20:39:06.67 |
-25:01:58.1 |
HIP 101808 |
17.48 |
| 2026-10-03 12:00 |
20:39:05.46 |
-25:01:59.8 |
HIP 101808 |
17.21 |
| 2026-10-04 00:00 |
20:39:04.27 |
-25:02:01.4 |
HIP 101808 |
16.94 |
| 2026-10-04 12:00 |
20:39:03.09 |
-25:02:02.9 |
HIP 101808 |
16.68 |
| 2026-10-05 00:00 |
20:39:01.94 |
-25:02:04.3 |
HIP 101808 |
16.42 |
| 2026-10-05 12:00 |
20:39:00.81 |
-25:02:05.7 |
HIP 101808 |
16.17 |
| 2026-10-06 00:00 |
20:38:59.70 |
-25:02:06.9 |
HIP 101808 |
15.92 |
| 2026-10-06 12:00 |
20:38:58.61 |
-25:02:08.1 |
HIP 101808 |
15.68 |
| 2026-10-07 00:00 |
20:38:57.53 |
-25:02:09.2 |
HIP 101808 |
15.44 |
| 2026-10-07 12:00 |
20:38:56.48 |
-25:02:10.2 |
HIP 101808 |
15.21 |
| 2026-10-08 00:00 |
20:38:55.45 |
-25:02:11.1 |
HIP 101808 |
14.98 |
| 2026-10-08 12:00 |
20:38:54.44 |
-25:02:12.0 |
HIP 101808 |
14.75 |
| 2026-10-09 00:00 |
20:38:53.45 |
-25:02:12.7 |
HIP 101808 |
14.54 |
| 2026-10-09 12:00 |
20:38:52.48 |
-25:02:13.4 |
HIP 101808 |
14.32 |
| 2026-10-10 00:00 |
20:38:51.53 |
-25:02:14.0 |
HIP 101808 |
14.12 |
| 2026-10-10 12:00 |
20:38:50.60 |
-25:02:14.5 |
HIP 101808 |
13.91 |
| 2026-10-11 00:00 |
20:38:49.69 |
-25:02:14.9 |
HIP 101808 |
13.72 |
| 2026-10-11 12:00 |
20:38:48.81 |
-25:02:15.2 |
HIP 101808 |
13.52 |
| 2026-10-12 00:00 |
20:38:47.94 |
-25:02:15.4 |
HIP 101808 |
13.34 |
| 2026-10-12 12:00 |
20:38:47.10 |
-25:02:15.6 |
HIP 101808 |
13.15 |
| 2026-10-13 00:00 |
20:38:46.27 |
-25:02:15.7 |
HIP 101808 |
12.98 |
| 2026-10-13 12:00 |
20:38:45.47 |
-25:02:15.6 |
HIP 101808 |
12.81 |
| 2026-10-14 00:00 |
20:38:44.69 |
-25:02:15.5 |
HIP 101808 |
12.64 |
| 2026-10-14 12:00 |
20:38:43.93 |
-25:02:15.4 |
HIP 101808 |
12.48 |
| 2026-10-15 00:00 |
20:38:43.19 |
-25:02:15.1 |
HIP 101808 |
12.32 |
| 2026-10-15 12:00 |
20:38:42.47 |
-25:02:14.7 |
HIP 101808 |
12.17 |
| 2026-10-16 00:00 |
20:38:41.77 |
-25:02:14.3 |
HIP 101808 |
12.03 |