메타데이터
| 항목 |
값 |
| Designation |
C/1997 BA6 (Spacewatch) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1999-11-27T13:51:09.898560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:50Z |
| Obs used |
520 |
| NEO |
- |
| M1 |
4.300 |
| K1 |
10.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2000-05-01.0000000 |
| e |
0.99888457 |
| q (au) |
3.436463 |
| a (au) |
3080.849437 |
| i (deg) |
72.717049 |
| Ω (om, deg) |
317.660522 |
| ω (w, deg) |
285.939608 |
| M (ma, deg) |
0.000896 |
밝기
산란 + 전체 선형
$$
M_a = (4.715 + 5.249\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
4.715 |
| n |
5.249 |
| gf |
1.000 |
| gb |
-0.692 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 1997-01-11 |
1998-11-25 |
+4.3922 |
-3.507 |
| 1998-11-25 |
1999-11-21 |
-2.6888 |
+1.565 |
| 1999-11-30 |
2002-09-12 |
-3.6083 |
+2.137 |
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 |
21:18:51.65 |
+60:15:18.2 |
HIP 105070 |
13.33 |
| 2026-07-29 12:00 |
21:18:46.94 |
+60:15:24.5 |
HIP 105070 |
12.73 |
| 2026-07-30 00:00 |
21:18:42.23 |
+60:15:30.4 |
HIP 105070 |
12.14 |
| 2026-07-30 12:00 |
21:18:37.51 |
+60:15:36.0 |
HIP 105070 |
11.55 |
| 2026-07-31 00:00 |
21:18:32.78 |
+60:15:41.3 |
HIP 105070 |
10.96 |
| 2026-07-31 12:00 |
21:18:28.04 |
+60:15:46.3 |
HIP 105070 |
10.36 |
| 2026-08-01 00:00 |
21:18:23.30 |
+60:15:50.9 |
HIP 105070 |
9.77 |
| 2026-08-01 12:00 |
21:18:18.55 |
+60:15:55.3 |
HIP 105070 |
9.18 |
| 2026-08-02 00:00 |
21:18:13.79 |
+60:15:59.3 |
HIP 105070 |
8.58 |
| 2026-08-02 12:00 |
21:18:09.03 |
+60:16:03.0 |
HIP 105070 |
7.99 |
| 2026-08-03 00:00 |
21:18:04.26 |
+60:16:06.4 |
HIP 105070 |
7.40 |
| 2026-08-03 12:00 |
21:17:59.48 |
+60:16:09.5 |
HIP 105070 |
6.80 |
| 2026-08-04 00:00 |
21:17:54.70 |
+60:16:12.2 |
HIP 105070 |
6.21 |
| 2026-08-04 12:00 |
21:17:49.92 |
+60:16:14.7 |
HIP 105070 |
5.61 |
| 2026-08-05 00:00 |
21:17:45.13 |
+60:16:16.8 |
HIP 105070 |
5.02 |
| 2026-08-05 12:00 |
21:17:40.34 |
+60:16:18.6 |
HIP 105070 |
4.43 |
| 2026-08-06 00:00 |
21:17:35.54 |
+60:16:20.1 |
HIP 105070 |
3.83 |
| 2026-08-06 12:00 |
21:17:30.74 |
+60:16:21.2 |
HIP 105070 |
3.24 |
| 2026-08-07 00:00 |
21:17:25.94 |
+60:16:22.1 |
HIP 105070 |
2.65 |
| 2026-08-07 12:00 |
21:17:21.14 |
+60:16:22.6 |
HIP 105070 |
2.07 |
| 2026-08-08 00:00 |
21:17:16.33 |
+60:16:22.8 |
HIP 105070 |
1.49 |
| 2026-08-08 12:00 |
21:17:11.52 |
+60:16:22.7 |
HIP 105070 |
0.95 |
| 2026-08-09 00:00 |
21:17:06.72 |
+60:16:22.2 |
HIP 105070 |
0.53 |
| 2026-08-09 12:00 |
21:17:01.91 |
+60:16:21.4 |
HIP 105070 |
0.61 |
| 2026-08-10 00:00 |
21:16:57.09 |
+60:16:20.4 |
HIP 105070 |
1.09 |
| 2026-08-10 12:00 |
21:16:52.28 |
+60:16:19.0 |
HIP 105070 |
1.65 |
| 2026-08-11 00:00 |
21:16:47.47 |
+60:16:17.2 |
HIP 105070 |
2.23 |
| 2026-08-11 12:00 |
21:16:42.66 |
+60:16:15.2 |
HIP 105070 |
2.82 |
| 2026-08-12 00:00 |
21:16:37.86 |
+60:16:12.8 |
HIP 105070 |
3.41 |
| 2026-08-12 12:00 |
21:16:33.05 |
+60:16:10.1 |
HIP 105070 |
4.01 |
| 2026-08-13 00:00 |
21:16:28.25 |
+60:16:07.1 |
HIP 105070 |
4.60 |
| 2026-08-13 12:00 |
21:16:23.44 |
+60:16:03.8 |
HIP 105070 |
5.20 |
| 2026-08-14 00:00 |
21:16:18.64 |
+60:16:00.1 |
HIP 105070 |
5.80 |
| 2026-08-14 12:00 |
21:16:13.85 |
+60:15:56.2 |
HIP 105070 |
6.39 |
| 2026-08-15 00:00 |
21:16:09.06 |
+60:15:51.9 |
HIP 105070 |
6.99 |
| 2026-08-15 12:00 |
21:16:04.27 |
+60:15:47.3 |
HIP 105070 |
7.59 |
| 2026-08-16 00:00 |
21:15:59.49 |
+60:15:42.4 |
HIP 105070 |
8.19 |
| 2026-08-16 12:00 |
21:15:54.71 |
+60:15:37.1 |
HIP 105070 |
8.79 |
| 2026-08-17 00:00 |
21:15:49.93 |
+60:15:31.6 |
HIP 105070 |
9.39 |
| 2026-08-17 12:00 |
21:15:45.17 |
+60:15:25.7 |
HIP 105070 |
9.99 |
| 2026-08-18 00:00 |
21:15:40.41 |
+60:15:19.5 |
HIP 105070 |
10.59 |
| 2026-08-18 12:00 |
21:15:35.65 |
+60:15:13.0 |
HIP 105070 |
11.18 |
| 2026-08-19 00:00 |
21:15:30.90 |
+60:15:06.2 |
HIP 105070 |
11.78 |