메타데이터
| 항목 |
값 |
| Designation |
C/1999 A1 (Tilbrook) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1999-01-29T15:46:41.666880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:57Z |
| Obs used |
68 |
| NEO |
- |
| M1 |
14.300 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1999-01-20.0000000 |
| e |
0.99589489 |
| q (au) |
0.730741 |
| a (au) |
178.007719 |
| i (deg) |
89.481788 |
| Ω (om, deg) |
259.123002 |
| ω (w, deg) |
232.669862 |
| M (ma, deg) |
359.995992 |
밝기
산란 + 전체 선형
$$
M_a = (13.200 + 2.643\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
13.200 |
| n |
2.643 |
| gf |
0.800 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-09-20 00:00 |
17:21:51.69 |
+16:28:47.9 |
HIP 85045 |
14.68 |
| 2026-09-20 12:00 |
17:21:51.99 |
+16:28:25.8 |
HIP 85045 |
14.58 |
| 2026-09-21 00:00 |
17:21:52.31 |
+16:28:03.8 |
HIP 85045 |
14.49 |
| 2026-09-21 12:00 |
17:21:52.66 |
+16:27:41.9 |
HIP 85045 |
14.40 |
| 2026-09-22 00:00 |
17:21:53.02 |
+16:27:19.9 |
HIP 85045 |
14.32 |
| 2026-09-22 12:00 |
17:21:53.41 |
+16:26:57.9 |
HIP 85045 |
14.24 |
| 2026-09-23 00:00 |
17:21:53.81 |
+16:26:36.0 |
HIP 85045 |
14.17 |
| 2026-09-23 12:00 |
17:21:54.24 |
+16:26:14.1 |
HIP 85045 |
14.10 |
| 2026-09-24 00:00 |
17:21:54.68 |
+16:25:52.2 |
HIP 85045 |
14.04 |
| 2026-09-24 12:00 |
17:21:55.15 |
+16:25:30.3 |
HIP 85045 |
13.98 |
| 2026-09-25 00:00 |
17:21:55.64 |
+16:25:08.5 |
HIP 85045 |
13.92 |
| 2026-09-25 12:00 |
17:21:56.15 |
+16:24:46.7 |
HIP 85045 |
13.87 |
| 2026-09-26 00:00 |
17:21:56.68 |
+16:24:24.9 |
HIP 85045 |
13.83 |
| 2026-09-26 12:00 |
17:21:57.23 |
+16:24:03.1 |
HIP 85045 |
13.80 |
| 2026-09-27 00:00 |
17:21:57.80 |
+16:23:41.4 |
HIP 85045 |
13.76 |
| 2026-09-27 12:00 |
17:21:58.39 |
+16:23:19.7 |
HIP 85045 |
13.74 |
| 2026-09-28 00:00 |
17:21:59.00 |
+16:22:58.1 |
HIP 85045 |
13.72 |
| 2026-09-28 12:00 |
17:21:59.64 |
+16:22:36.5 |
HIP 85045 |
13.71 |
| 2026-09-29 00:00 |
17:22:00.29 |
+16:22:14.9 |
HIP 85045 |
13.70 |
| 2026-09-29 12:00 |
17:22:00.96 |
+16:21:53.3 |
HIP 85045 |
13.70 |
| 2026-09-30 00:00 |
17:22:01.65 |
+16:21:31.8 |
HIP 85045 |
13.71 |
| 2026-09-30 12:00 |
17:22:02.37 |
+16:21:10.4 |
HIP 85045 |
13.72 |
| 2026-10-01 00:00 |
17:22:03.10 |
+16:20:48.9 |
HIP 85045 |
13.74 |
| 2026-10-01 12:00 |
17:22:03.85 |
+16:20:27.6 |
HIP 85045 |
13.77 |
| 2026-10-02 00:00 |
17:22:04.63 |
+16:20:06.2 |
HIP 85045 |
13.80 |
| 2026-10-02 12:00 |
17:22:05.42 |
+16:19:45.0 |
HIP 85045 |
13.84 |
| 2026-10-03 00:00 |
17:22:06.24 |
+16:19:23.7 |
HIP 85045 |
13.89 |
| 2026-10-03 12:00 |
17:22:07.07 |
+16:19:02.6 |
HIP 85045 |
13.95 |
| 2026-10-04 00:00 |
17:22:07.92 |
+16:18:41.4 |
HIP 85045 |
14.01 |
| 2026-10-04 12:00 |
17:22:08.80 |
+16:18:20.4 |
HIP 85045 |
14.08 |
| 2026-10-05 00:00 |
17:22:09.69 |
+16:17:59.4 |
HIP 85045 |
14.16 |
| 2026-10-05 12:00 |
17:22:10.60 |
+16:17:38.4 |
HIP 85045 |
14.25 |
| 2026-10-06 00:00 |
17:22:11.54 |
+16:17:17.5 |
HIP 85045 |
14.34 |
| 2026-10-06 12:00 |
17:22:12.49 |
+16:16:56.7 |
HIP 85045 |
14.44 |
| 2026-10-07 00:00 |
17:22:13.46 |
+16:16:35.9 |
HIP 85045 |
14.55 |
| 2026-10-07 12:00 |
17:22:14.45 |
+16:16:15.2 |
HIP 85045 |
14.66 |
| 2026-10-08 00:00 |
17:22:15.47 |
+16:15:54.5 |
HIP 85045 |
14.78 |
| 2026-10-08 12:00 |
17:22:16.50 |
+16:15:34.0 |
HIP 85045 |
14.91 |
| 2026-10-09 00:00 |
17:22:17.55 |
+16:15:13.5 |
HIP 85045 |
15.05 |
| 2026-10-09 12:00 |
17:22:18.61 |
+16:14:53.0 |
HIP 85045 |
15.19 |
| 2026-10-10 00:00 |
17:22:19.70 |
+16:14:32.7 |
HIP 85045 |
15.34 |
| 2026-10-10 12:00 |
17:22:20.81 |
+16:14:12.4 |
HIP 85045 |
15.50 |
| 2026-10-11 00:00 |
17:22:21.94 |
+16:13:52.2 |
HIP 85045 |
15.66 |