메타데이터
| 항목 |
값 |
| Designation |
C/1988 A1 (Liller) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1988-03-31T02:45:25.882560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:36Z |
| Obs used |
427 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
9.000 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1988-04-26.0000000 |
| e |
0.99656338 |
| q (au) |
0.841336 |
| a (au) |
244.814711 |
| i (deg) |
73.322355 |
| Ω (om, deg) |
31.515349 |
| ω (w, deg) |
57.387934 |
| M (ma, deg) |
0.006660 |
밝기
산란 + 전체 선형
$$
M_a = (4.936 + 3.835\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
4.936 |
| n |
3.835 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
| 1988-01-12 |
1988-03-31 |
+0.6520 |
+0.817 |
| 1988-04-03 |
1988-08-12 |
-0.1051 |
-0.062 |
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 |
13:32:51.58 |
-56:20:56.6 |
HIP 66136 |
4.99 |
| 2026-07-29 12:00 |
13:32:52.20 |
-56:20:38.2 |
HIP 66136 |
4.85 |
| 2026-07-30 00:00 |
13:32:52.84 |
-56:20:20.0 |
HIP 66136 |
4.73 |
| 2026-07-30 12:00 |
13:32:53.51 |
-56:20:01.8 |
HIP 66136 |
4.62 |
| 2026-07-31 00:00 |
13:32:54.20 |
-56:19:43.7 |
HIP 66136 |
4.53 |
| 2026-07-31 12:00 |
13:32:54.92 |
-56:19:25.8 |
HIP 66136 |
4.45 |
| 2026-08-01 00:00 |
13:32:55.66 |
-56:19:07.9 |
HIP 66136 |
4.39 |
| 2026-08-01 12:00 |
13:32:56.44 |
-56:18:50.1 |
HIP 66136 |
4.35 |
| 2026-08-02 00:00 |
13:32:57.23 |
-56:18:32.5 |
HIP 66136 |
4.33 |
| 2026-08-02 12:00 |
13:32:58.05 |
-56:18:14.9 |
HIP 66136 |
4.32 |
| 2026-08-03 00:00 |
13:32:58.90 |
-56:17:57.5 |
HIP 66136 |
4.34 |
| 2026-08-03 12:00 |
13:32:59.78 |
-56:17:40.2 |
HIP 66136 |
4.37 |
| 2026-08-04 00:00 |
13:33:00.68 |
-56:17:22.9 |
HIP 66136 |
4.42 |
| 2026-08-04 12:00 |
13:33:01.60 |
-56:17:05.8 |
HIP 66136 |
4.49 |
| 2026-08-05 00:00 |
13:33:02.55 |
-56:16:48.8 |
HIP 66136 |
4.57 |
| 2026-08-05 12:00 |
13:33:03.53 |
-56:16:31.9 |
HIP 66136 |
4.67 |
| 2026-08-06 00:00 |
13:33:04.53 |
-56:16:15.1 |
HIP 66136 |
4.79 |
| 2026-08-06 12:00 |
13:33:05.55 |
-56:15:58.5 |
HIP 66136 |
4.92 |
| 2026-08-07 00:00 |
13:33:06.61 |
-56:15:41.9 |
HIP 66136 |
5.06 |
| 2026-08-07 12:00 |
13:33:07.68 |
-56:15:25.5 |
HIP 66136 |
5.21 |
| 2026-08-08 00:00 |
13:33:08.78 |
-56:15:09.2 |
HIP 66136 |
5.37 |
| 2026-08-08 12:00 |
13:33:09.91 |
-56:14:53.0 |
HIP 66136 |
5.55 |
| 2026-08-09 00:00 |
13:33:11.06 |
-56:14:36.9 |
HIP 66136 |
5.73 |
| 2026-08-09 12:00 |
13:33:12.24 |
-56:14:21.0 |
HIP 66136 |
5.92 |
| 2026-08-10 00:00 |
13:33:13.44 |
-56:14:05.2 |
HIP 66136 |
6.11 |
| 2026-08-10 12:00 |
13:33:14.66 |
-56:13:49.5 |
HIP 66136 |
6.31 |
| 2026-08-11 00:00 |
13:33:15.91 |
-56:13:33.9 |
HIP 66136 |
6.52 |
| 2026-08-11 12:00 |
13:33:17.19 |
-56:13:18.4 |
HIP 66136 |
6.73 |
| 2026-08-12 00:00 |
13:33:18.49 |
-56:13:03.1 |
HIP 66136 |
6.95 |
| 2026-08-12 12:00 |
13:33:19.81 |
-56:12:47.9 |
HIP 66136 |
7.18 |
| 2026-08-13 00:00 |
13:33:21.16 |
-56:12:32.9 |
HIP 66136 |
7.40 |
| 2026-08-13 12:00 |
13:33:22.53 |
-56:12:18.0 |
HIP 66136 |
7.63 |
| 2026-08-14 00:00 |
13:33:23.93 |
-56:12:03.2 |
HIP 66136 |
7.86 |
| 2026-08-14 12:00 |
13:33:25.34 |
-56:11:48.5 |
HIP 66136 |
8.10 |
| 2026-08-15 00:00 |
13:33:26.79 |
-56:11:34.0 |
HIP 66136 |
8.34 |
| 2026-08-15 12:00 |
13:33:28.25 |
-56:11:19.6 |
HIP 66136 |
8.58 |
| 2026-08-16 00:00 |
13:33:29.74 |
-56:11:05.4 |
HIP 66136 |
8.83 |
| 2026-08-16 12:00 |
13:33:31.26 |
-56:10:51.3 |
HIP 66136 |
9.07 |
| 2026-08-17 00:00 |
13:33:32.79 |
-56:10:37.3 |
HIP 66136 |
9.32 |
| 2026-08-17 12:00 |
13:33:34.35 |
-56:10:23.5 |
HIP 66136 |
9.57 |
| 2026-08-18 00:00 |
13:33:35.94 |
-56:10:09.8 |
HIP 66136 |
9.83 |
| 2026-08-18 12:00 |
13:33:37.54 |
-56:09:56.3 |
HIP 66136 |
10.08 |
| 2026-08-19 00:00 |
13:33:39.17 |
-56:09:42.9 |
HIP 66136 |
10.34 |