Table I. SWAN SOHO Preperihelion Observations of Comet Hale-Bopp (1995 O1)

Date

r

D

B

F

Q

1997

(AU)

(AU)

(Rayleighs)

(1011 phot cm-2 s-1)

(1030 s-1)

Jan 01

1.75

2.56

382

3.197

2.20

Jan 03

1.73

2.53

356

3.029

2.06

Jan 04

1.72

2.51

398

3.175

2.27

Jan 06

1.69

2.48

379

3.122

2.05

Jan 08

1.66

2.45

394

3.048

1.97

Jan 10

1.64

2.42

427

2.957

2.13

Jan 23

1.48

2.18

709

3.145

2.21

Jan 24

1.46

2.16

758

3.145

2.64

Jan 25

1.45

2.14

953

3.147

2.52

Jan 30

1.39

2.04

984

3.092

3.18

Jan 31

1.38

2.02

993

3.096

3.02

Feb 03

1.34

1.96

1209

2.886

3.60

Feb 05

1.32

1.93

1344

2.991

4.06

Feb 07

1.31

1.89

1589

2.886

4.25

Feb 10

1.26

1.83

1846

2.972

4.10

Feb 13

1.23

1.77

2452

3.140

5.35

Feb 14

1.22

1.75

2567

3.135

4.98

Feb 15

1.21

1.73

2779

3.127

5.69

Feb 17

1.19

1.69

3209

3.130

5.37

Feb 21

1.14

1.62

3948

3.128

7.02

Feb 22

1.13

1.60

4150

3.104

5.93

Feb 27

1.09

1.52

5413

2.866

7.34

Feb 28

1.08

1.50

5922

2.872

8.21

Mar 03

1.05

1.46

6965

3.023

7.94

Mar 06

1.03

1.42

7870

3.040

9.69

Mar 07

1.02

1.41

8262

3.010

9.27

Mar 13

0.98

1.35

9409

2.862

8.89

Mar 22

0.93

1.32

11312

3.013

9.49

Mar 23

0.93

1.32

11112

3.034

8.64

Mar 25

0.92

1.32

11347

3.022

10.03

Mar 28

0.92

1.33

11526

3.107

9.67

r = heliocentric distance in AU

D = geocentric distance in AU

B = brightness in Rayleighs

F = solar Lyman-a flux at 1 AU

Q = water production rate*+.

 

 

 

Table II. SWAN SOHO Postperihelion Observations of Comet Hale-Bopp (1995 O1)

Date

r

D

B

F

Q

1997

(AU)

(AU)

(Rayleighs)

(1011 phot cm-2 s-1)

(1030 s-1)

Apr 01

0.91

1.35

12121

2.980

10.19

Apr 07

0.92

1.41

11038

3.056

8.81

Apr 10

0.93

1.44

11109

2.951

9.76

Apr 12

0.93

1.47

10030

2.932

10.49

Apr 14

0.94

1.50

9935

2.900

11.21

Apr 17

0.96

1.54

9681

2.904

10.58

Apr 18

0.96

1.55

9769

2.848

12.10

Apr 19

0.97

1.57

9754

2.909

12.43

Apr 21

0.98

1.60

9795

2.981

12.04

Apr 25

1.01

1.67

8753

2.928

12.15

Apr 26

1.02

1.68

8353

2.963

11.80

Apr 28

1.03

1.72

7257

3.052

8.91

May 01

1.06

1.77

6003

3.021

8.15

May 07

1.11

1.87

4057

2.974

5.91

May 10

1.14

1.92

3798

3.011

6.06

May 12

1.16

1.96

3678

3.074

5.38

May 17

1.21

2.04

3524

3.059

5.73

May 24

1.29

2.15

2982

3.038

5.42

r = heliocentric distance in AU

D = geocentric distance in AU

B = brightness in Rayleighs

F = solar Lyman-a flux at 1 AU

Q = water production rate